CVE-2026-33054

CRITICALNVD 9.810.0
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-18. NVD baseline CVSS 9.8; sources differ by 0.2.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-13594 (ENISA EUVD) · GHSA-8qvf-mr4w-9x2c (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
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: 0.7%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Mesop is a Python-based UI framework that allows users to build web applications. Versions 1.2.2 and below contain a Path Traversal vulnerability that allows any user supplying an untrusted state_token through the UI stream payload to arbitrarily target files on the disk under the standard file-based runtime backend. This can result in application denial of service (via crash loops when reading non-msgpack target files as configurations), or arbitrary file manipulation. This vulnerability heavily exposes systems hosted utilizing FileStateSessionBackend. Unauthorized malicious actors could interact with arbitrary payloads overwriting or explicitly removing underlying service resources natively outside the application bounds. This issue has been fixed in version 1.2.3.

CVSS v3
9.8
EG Score
10.0CRITICALmedium confidence
EG Risk
76
EG Risk 76/100

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)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 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
0.7%
EPSS %ILE
54th
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 (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% 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

March 20, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Oct 31, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Path Traversal utilizing `FileStateSessionBackend` leads to Application Denial of Service and File Write/Deletion · Advisory · mesop-dev/mesop · GitHub

https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
GitHub release Patch Available

v1.2.3

Patch available: mesop-dev/mesop v1.2.3

https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
GitHub commit Patch Available

commit c6b382f363b7 (mesop-dev/mesop)

Patch available: mesop-dev/mesop v1.2.3 (contains commit c6b382f363b7)

https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
pipmesop @ 1.2.3 (fixes <= 1.2.2)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
mesop0.0.1 ... 1.2.2rc1 (92 versions)
  • every version up to 1.2.3: fixed in 1.2.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 59× 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 96 of 127 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 00:48 UTCEG score recompute
  2. 2026-11-02 00:47 UTCGHSA enrichmentGHSA-8qvf-mr4w-9x2c · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  4. 2026-11-01 07:54 UTCGHSA enrichmentGHSA-8qvf-mr4w-9x2c · GitHub severity CRITICAL · GitHub CVSS 10.0
  5. 2026-11-01 07:54 UTCEG score recompute▲ 0.20
  6. 2026-11-01 01:08 UTCEG score recompute
  7. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  8. 2026-10-31 01:24 UTCEG score recompute
  9. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  10. 2026-10-30 01:45 UTCEG score recompute
  11. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-29 02:06 UTCEG score recompute
  13. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-28 02:26 UTCEG score recompute
  15. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-10-27 02:44 UTCEG score recompute
  17. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  18. 2026-10-25 23:00 UTCEG score recompute
  19. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  20. 2026-10-25 14:35 UTCEG score recompute
  21. 2026-10-24 23:20 UTCEG score recompute
  22. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  23. 2026-10-23 23:41 UTCEG score recompute
  24. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  25. 2026-10-23 00:01 UTCEG score recompute
Show 71 more
  1. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  2. 2026-10-22 00:20 UTCEG score recompute
  3. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  4. 2026-10-21 00:39 UTCEG score recompute
  5. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  6. 2026-10-20 00:58 UTCEG score recompute
  7. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-10-18 23:55 UTCEG score recompute
  9. 2026-10-18 03:47 UTCEG score recompute
  10. 2026-10-18 00:14 UTCEG score recompute
  11. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-17 00:32 UTCEG score recompute
  13. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-10-16 00:12 UTCEG score recompute
  15. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  16. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-14 16:23 UTCEG score recompute
  18. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-10-13 15:15 UTCEG score recompute
  20. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-10-12 15:35 UTCEG score recompute
  22. 2026-10-11 19:56 UTCEG score recompute
  23. 2026-10-11 17:09 UTCEG score recompute
  24. 2026-10-11 14:36 UTCEG score recompute
  25. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-10-11 08:25 UTCOSV refresh
  27. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  29. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  30. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  31. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  32. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  33. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  34. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  35. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  36. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  37. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  38. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  39. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  40. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  41. 2026-09-21 21:01 UTCOSV refresh
  42. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  43. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  44. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  45. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  46. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  47. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  48. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  49. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  50. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  51. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  52. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  53. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  54. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  55. 2026-09-02 17:08 UTCOSV refresh
  56. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  57. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  58. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  59. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  60. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  61. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  62. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  63. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  64. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  65. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  66. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  67. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  68. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  69. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  70. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  71. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile

Frequently asked(5)

What is CVE-2026-33054?
CVE-2026-33054 is a critical-severity vulnerability; its CVE record was published on March 20, 2026. Mesop is a Python-based UI framework that allows users to build web applications. Versions 1.2.2 and below contain a Path Traversal vulnerability that allows any user supplying an untrusted state_token through the UI stream payload to arbitrarily target files on the disk under the standard…
When was the CVE record for CVE-2026-33054 published?
The CVE record for CVE-2026-33054 was published on March 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-33054 actively exploited?
CVE-2026-33054 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33054?
CVE-2026-33054 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 10.0 (CRITICAL).
How do I remediate CVE-2026-33054?
A fix for CVE-2026-33054 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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