CVE-2025-56005

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-20. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-3342 (ENISA EUVD) · GHSA-qc6m-pwr3-g72p (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 19%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the picklefile parameter in the yacc() function. This parameter accepts a .pkl file that is deserialized with pickle.load() without validation. Because pickle allows execution of embedded code via __reduce__(), an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
19%
EPSS %ILE
97th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
19% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 20, 2026

Last Modified

September 17, 2026

Advisory Details (10)

Auto-updated Oct 31, 2026
🔬 Proof of concept available. No fix on record yet.
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/30/1
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/29/2
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/29/1
Web page🟡 PoC Available

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/28/5
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/23/5
Web page🟡 PoC Available

oss-security - CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/23/4
Web page

Clarification: Unsafe pickle deserialization in PLY yacc() is RCE (CVE‑2025‑56005) · Issue #1 · tom025/ply_exploit_rejection · GitHub

https://github.com/tom025/ply_exploit_rejection/issues/1
Web page🟡 PoC Available

GitHub - tom025/ply_exploit_rejection: Arguments to reject CVE-2025-56005 · GitHub

https://github.com/tom025/ply_exploit_rejection
Web page

GitHub - bohmiiidd/Undocumented-RCE-in-PLY: Undocumented RCE in PLY via `picklefile` Parameter · GitHub

https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
Web page

GitHub - bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005: Clarification Regarding the Rejection Arguments · GitHub

https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005

Vendor Advisories for CVE-2025-56005(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10 ... 3.11-9 (8 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10 ... 3.11-9 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10, 3.11-11, 3.11-12, 3.11-9
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10, 3.11-11, 3.11-12, 3.11-9
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 73× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 247 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 150 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 17:02 UTCEG score recompute
  2. 2026-11-02 17:02 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-01 15:56 UTCEG score recompute
  4. 2026-11-01 15:56 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-31 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  6. 2026-10-31 14:51 UTCEG score recompute
  7. 2026-10-31 14:51 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-30 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  9. 2026-10-30 13:45 UTCEG score recompute
  10. 2026-10-30 13:45 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-29 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  12. 2026-10-29 12:29 UTCEG score recompute
  13. 2026-10-29 12:29 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-28 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  15. 2026-10-28 11:16 UTCEG score recompute
  16. 2026-10-28 11:16 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-27 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  18. 2026-10-27 09:37 UTCEG score recompute
  19. 2026-10-27 09:37 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-26 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  21. 2026-10-26 08:32 UTCEG score recompute
  22. 2026-10-26 08:32 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-25 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  24. 2026-10-25 16:17 UTCEG score recompute
  25. 2026-10-25 07:26 UTCEG score recompute
Show 72 more
  1. 2026-10-25 07:26 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-24 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  3. 2026-10-24 06:20 UTCEG score recompute
  4. 2026-10-24 06:20 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-23 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  6. 2026-10-23 05:14 UTCEG score recompute
  7. 2026-10-23 05:13 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-22 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  9. 2026-10-22 04:08 UTCEG score recompute
  10. 2026-10-22 04:07 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-21 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  12. 2026-10-21 02:57 UTCEG score recompute
  13. 2026-10-21 02:57 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-20 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  15. 2026-10-20 01:49 UTCEG score recompute
  16. 2026-10-20 01:49 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-19 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  18. 2026-10-19 00:43 UTCEG score recompute
  19. 2026-10-19 00:42 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-18 05:25 UTCEG score recompute
  21. 2026-10-17 23:37 UTCEG score recompute
  22. 2026-10-17 23:37 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  24. 2026-10-16 22:29 UTCEG score recompute
  25. 2026-10-16 22:29 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-16 16:39 UTCEPSS rescoreEPSS 19% · 97th percentile
  27. 2026-10-15 19:09 UTCEG score recompute
  28. 2026-10-15 19:09 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-15 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  30. 2026-10-14 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  31. 2026-10-14 12:54 UTCEG score recompute
  32. 2026-10-14 12:54 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-13 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  34. 2026-10-13 11:48 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-12 16:55 UTCEG score recompute
  36. 2026-10-12 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  37. 2026-10-12 10:42 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-11 20:29 UTCEG score recompute
  39. 2026-10-11 18:41 UTCEG score recompute
  40. 2026-10-11 15:16 UTCEG score recompute
  41. 2026-10-11 13:47 UTCEPSS rescoreEPSS 19% · 97th percentile
  42. 2026-10-10 19:59 UTCEPSS rescoreEPSS 19% · 97th percentile
  43. 2026-10-09 20:06 UTCEPSS rescoreEPSS 19% · 97th percentile
  44. 2026-10-08 17:10 UTCEPSS rescoreEPSS 19% · 97th percentile
  45. 2026-10-07 23:47 UTCEPSS rescoreEPSS 19% · 97th percentile
  46. 2026-10-07 06:24 UTCOSV refresh
  47. 2026-10-06 15:17 UTCEPSS rescoreEPSS 19% · 97th percentile
  48. 2026-10-05 17:42 UTCEPSS rescoreEPSS 19% · 97th percentile
  49. 2026-10-03 14:24 UTCEPSS rescoreEPSS 19% · 97th percentile
  50. 2026-10-01 19:49 UTCEPSS rescoreEPSS 19% · 97th percentile
  51. 2026-09-30 15:02 UTCEPSS rescoreEPSS 19% · 97th percentile
  52. 2026-09-26 15:58 UTCEPSS rescoreEPSS 19% · 97th percentile
  53. 2026-09-26 00:25 UTCEPSS rescoreEPSS 19% · 97th percentile
  54. 2026-09-24 14:02 UTCEPSS rescoreEPSS 19% · 97th percentile
  55. 2026-09-23 13:47 UTCEPSS rescoreEPSS 19% · 97th percentile
  56. 2026-09-21 21:06 UTCEPSS rescoreEPSS 19% · 97th percentile
  57. 2026-09-19 15:42 UTCEPSS rescoreEPSS 19% · 97th percentile
  58. 2026-09-18 19:27 UTCEPSS rescoreEPSS 19% · 97th percentile
  59. 2026-09-17 19:29 UTCEPSS rescoreEPSS 19% · 97th percentile
  60. 2026-09-17 12:19 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-09-17 12:12 UTCEG score recompute
  62. 2026-09-17 12:12 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  63. 2026-09-16 14:07 UTCEPSS rescoreEPSS 18% · 96th percentile
  64. 2026-09-16 05:14 UTCEPSS rescoreEPSS 18% · 96th percentile
  65. 2026-09-12 15:00 UTCEPSS rescoreEPSS 18% · 96th percentile
  66. 2026-09-11 14:52 UTCEPSS rescoreEPSS 18% · 96th percentile
  67. 2026-09-11 09:36 UTCEPSS rescoreEPSS 18% · 96th percentile
  68. 2026-09-10 09:34 UTCEPSS rescoreEPSS 18% · 96th percentile
  69. 2026-09-08 21:59 UTCEPSS rescoreEPSS 18% · 96th percentile
  70. 2026-09-07 16:00 UTCEPSS rescoreEPSS 17% · 96th percentile
  71. 2026-09-06 13:47 UTCEPSS rescoreEPSS 17% · 96th percentile
  72. 2026-09-05 15:28 UTCEPSS rescoreEPSS 17% · 96th percentile

Frequently asked(5)

What is CVE-2025-56005?
CVE-2025-56005 is a critical-severity vulnerability; its CVE record was published on January 20, 2026. An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the picklefile parameter in the yacc() function. This parameter accepts a .pkl file that is deserialized with pickle.load() without validation. Because pickle allows execution of…
When was the CVE record for CVE-2025-56005 published?
The CVE record for CVE-2025-56005 was published on January 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 17, 2026; the record at its source may have been updated since.
Is CVE-2025-56005 actively exploited?
CVE-2025-56005 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-56005?
CVE-2025-56005 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-56005?
No fix for CVE-2025-56005 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2025-56005 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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