CVE-2026-53671

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-70243 (ENISA EUVD)Source: ENISA EUVD

9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines 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: 0.5%CVSS: 9.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the abstract transformer in prevail treats writes through a T_CTX-typed base register as a silent no-op: do_mem_store in src/crab/ebpf_transformer.cpp only models T_STACK stores, and the checker's T_CTX bounds arm never tests AccessType::write. An attacker can craft an eBPF program that overwrites a context field (e.g., ctx->data), reload that field typed as T_PACKET, and dereference an attacker-controlled address — and prevail will report the program as safe. This issue has been patched in version 0.2.4.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
73
EG Risk 73/100

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)
Severity93% × 45%
Impact severity (EG Severity): CVSS 9.3 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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
43rd
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 (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.

EG Severity
9.3 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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.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.

A fix is available. Apply it within your standard update timelines 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.

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

September 2, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Oct 3, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub advisoryMentions a patch (unverified)

Context-write no-op in do_mem_store allows unsafe eBPF programs to pass verification · Advisory · vbpf/prevail · GitHub

https://github.com/vbpf/prevail/security/advisories/GHSA-65rv-h458-cq99
GitHub release Patch Available

v0.2.4

Patch available: vbpf/prevail v0.2.4

https://github.com/vbpf/prevail/releases/tag/v0.2.4
GitHub commit Patch Available

commit de65234f67d2 (vbpf/prevail)

Patch available: vbpf/prevail v0.2.4 (contains commit de65234f67d2)

https://github.com/vbpf/prevail/commit/de65234f67d2608b54d12571edb585ead224363c

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 60× 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 100 of 117 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. None are among the latest 100 rows. The 17 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 20:31 UTCEG score recompute
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-31 18:19 UTCEG score recompute
  4. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-30 15:58 UTCEG score recompute
  7. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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  9. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-28 11:28 UTCEG score recompute
  11. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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  13. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  15. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-25 14:20 UTCEG score recompute
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  18. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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  20. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-22 22:08 UTCEG score recompute
  22. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-21 19:45 UTCEG score recompute
  24. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-10-20 17:33 UTCEG score recompute
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  1. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-19 15:14 UTCEG score recompute
  4. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-18 03:31 UTCEG score recompute
  6. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-17 10:48 UTCEG score recompute
  8. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-16 08:32 UTCEG score recompute
  10. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-15 06:19 UTCEG score recompute
  12. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-14 01:59 UTCEG score recompute
  14. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-10-12 22:16 UTCEG score recompute
  16. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-12 15:57 UTCEG score recompute
  18. 2026-10-11 19:40 UTCEG score recompute
  19. 2026-10-11 16:55 UTCEG score recompute
  20. 2026-10-11 14:18 UTCEG score recompute
  21. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-09 23:46 UTCEG score recompute
  24. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-09 01:38 UTCEG score recompute
  26. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  27. 2026-10-08 03:30 UTCEG score recompute
  28. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  29. 2026-10-06 16:28 UTCEG score recompute
  30. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  31. 2026-10-05 20:28 UTCEG score recompute
  32. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  33. 2026-10-05 01:15 UTCEG score recompute
  34. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-10-03 16:36 UTCEG score recompute
  36. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  37. 2026-10-02 21:34 UTCEG score recompute
  38. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  39. 2026-10-02 00:32 UTCEG score recompute
  40. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  41. 2026-09-30 19:19 UTCEG score recompute
  42. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-09-29 16:02 UTCEG score recompute
  44. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-09-29 00:39 UTCEG score recompute
  46. 2026-09-28 15:44 UTCEG score recompute
  47. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  48. 2026-09-27 16:53 UTCEG score recompute
  49. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  50. 2026-09-26 17:25 UTCEG score recompute
  51. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  52. 2026-09-26 04:52 UTCEG score recompute
  53. 2026-09-24 15:20 UTCEG score recompute
  54. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  55. 2026-09-23 20:21 UTCEG score recompute
  56. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-09-22 18:02 UTCEG score recompute
  58. 2026-09-21 22:38 UTCEG score recompute
  59. 2026-09-20 23:58 UTCEG score recompute
  60. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  61. 2026-09-19 17:52 UTCEG score recompute
  62. 2026-09-18 23:00 UTCEG score recompute
  63. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  64. 2026-09-17 20:37 UTCEG score recompute
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  66. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-09-16 09:04 UTCEG score recompute
  68. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  69. 2026-09-15 05:43 UTCEG score recompute
  70. 2026-09-13 18:40 UTCEG score recompute
  71. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  72. 2026-09-12 16:07 UTCEG score recompute
  73. 2026-09-11 17:32 UTCEG score recompute
  74. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  75. 2026-09-11 10:00 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-53671?
CVE-2026-53671 is a critical-severity vulnerability; its CVE record was published on September 2, 2026. PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the abstract transformer in prevail treats writes through a T_CTX-typed base register as a silent no-op: do_mem_store in src/crab/ebpf_transformer.cpp only models T_STACK stores, and the…
When was the CVE record for CVE-2026-53671 published?
The CVE record for CVE-2026-53671 was published on September 2, 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-53671 actively exploited?
CVE-2026-53671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53671?
CVE-2026-53671 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53671?
A fix for CVE-2026-53671 is available: update to the fixed version the vendor names in its advisory.

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