CVE-2026-91135

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (37th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Heap-based buffer overflow vulnerability in Apache Thrift C++ THeaderTransport.

When an application enables the ZLIB transform for the frames it sends, THeaderTransport::transform() copies the compressed frame into the write buffer without making sure it fits. Data that does not compress, such as content a remote peer supplied, grows under compression, so the copy writes past the end of the heap buffer by an amount that grows with the size of the frame, and for large frames it also reads past the end of the transform buffer.

This issue affects Apache Thrift: before 0.25.0.

Users are recommended to upgrade to version 0.25.0, which fixes the issue.

CVSS v3
9.2
EG Score
9.2CRITICALmedium confidence
EG Risk
42
EG Risk 42/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity92% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 2, 2026

Last Modified

October 2, 2026

Advisory Details (2)

Auto-updated Oct 2, 2026
Fix named in the CVE record.
generic

Pony Mail

https://lists.apache.org/thread/rbpwlhlxnv2qgyk8cfscp2d2fd3p0ojb
generic

Pony Mail

https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1

Vendor Advisories for CVE-2026-91135(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
thrift0.17.0-2 ... 0.24.0-2 (21 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
thrift0.19.0-4 ... 0.24.0-2 (11 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
thrift0.19.0-4 ... 0.24.0-2 (11 versions)
  • 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 27× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-10-05 08:18 UTCGHSA enrichment
  2. 2026-10-05 04:26 UTCGHSA enrichment
  3. 2026-10-05 00:34 UTCEG score recompute
  4. 2026-10-05 00:33 UTCGHSA enrichment
  5. 2026-10-04 23:22 UTCEPSS rescore
  6. 2026-10-04 20:42 UTCGHSA enrichment
  7. 2026-10-04 16:49 UTCGHSA enrichment
  8. 2026-10-04 12:57 UTCGHSA enrichment
  9. 2026-10-04 09:04 UTCGHSA enrichment
  10. 2026-10-04 05:13 UTCGHSA enrichment
  11. 2026-10-04 01:21 UTCGHSA enrichment
  12. 2026-10-03 21:30 UTCGHSA enrichment
  13. 2026-10-03 17:38 UTCEG score recompute
  14. 2026-10-03 17:38 UTCGHSA enrichment
  15. 2026-10-03 13:46 UTCGHSA enrichment
  16. 2026-10-03 09:51 UTCGHSA enrichment
  17. 2026-10-03 05:57 UTCGHSA enrichment
  18. 2026-10-03 02:05 UTCGHSA enrichment
  19. 2026-10-02 22:12 UTCGHSA enrichment
  20. 2026-10-02 18:19 UTCEG score recompute
  21. 2026-10-02 18:19 UTCGHSA enrichment
  22. 2026-10-02 17:55 UTCEG score recompute
  23. 2026-10-02 17:55 UTCGHSA enrichment
  24. 2026-10-02 14:41 UTCGHSA enrichment
  25. 2026-10-02 11:25 UTCEG score recompute
Show 2 more
  1. 2026-10-02 10:41 UTCEG score recompute
  2. 2026-10-02 10:40 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-91135?
CVE-2026-91135 is a critical vulnerability published on October 2, 2026. Heap-based buffer overflow vulnerability in Apache Thrift C++ THeaderTransport. When an application enables the ZLIB transform for the frames it sends, THeaderTransport::transform() copies the compressed frame into the write buffer without making sure it fits. Data that does not compress, such as…
When was CVE-2026-91135 disclosed?
CVE-2026-91135 was first published on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91135 actively exploited?
CVE-2026-91135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-91135?
CVE-2026-91135 has a CVSS base score of 9.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-91135?
A fix for CVE-2026-91135 is available — its CVE record says: "Users are recommended to upgrade to version 0.25.0, which fixes the issue." The vendor advisories EchelonGraph has for CVE-2026-91135 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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