CVE-2026-102566

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-29. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

CTranslate2 before 4.8.1 contains a heap-based buffer overflow in the binary model loader that fails to validate payload length against allocated buffer size. Attackers can craft malicious model files with oversized payload lengths to write past heap allocation boundaries, causing crashes or arbitrary code execution.

CVSS v3
7.8
EG Score
7.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
0.1%
EPSS %ILE
3rd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (6)

Auto-updated Sep 29, 2026
Patch available. Sources: github_pr, github_commit, github_release.
generic

CTranslate2 before 4.8.1 Heap Buffer Overflow via model.bin | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ctranslate2-before-4.8.1-heap-buffer-overflow-via-model-bin
generic

GitHub - OpenNMT/CTranslate2: Fast inference engine for Transformer models · GitHub

https://github.com/OpenNMT/CTranslate2
github_release Patch Available

v4.8.1

Patch available: OpenNMT/CTranslate2 v4.8.1

https://github.com/OpenNMT/CTranslate2/releases/tag/v4.8.1
generic

CTranslate2/src/models/model.cc at v4.8.0 · OpenNMT/CTranslate2 · GitHub

https://github.com/OpenNMT/CTranslate2/blob/v4.8.0/src/models/model.cc#L656-L657
github_commit Patch Available

commit d9b991e07009 (OpenNMT/CTranslate2)

Patch available: OpenNMT/CTranslate2 v4.8.1 (contains commit d9b991e07009)

https://github.com/OpenNMT/CTranslate2/commit/d9b991e0700933a0c05373df8b52ed89cdcab96d
github_pr Patch Available

Fix model load heap overflow

Patch available: OpenNMT/CTranslate2 v4.8.1 (PR #2068 merged 2026-07-02)

https://github.com/OpenNMT/CTranslate2/pull/2068

Vendor Advisories for CVE-2026-102566(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 21× 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. 2026-10-04 07:48 UTCGHSA enrichment
  2. 2026-10-03 19:29 UTCEG score recompute
  3. 2026-10-03 19:29 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 07:10 UTCGHSA enrichment
  6. 2026-10-02 18:50 UTCEG score recompute
  7. 2026-10-02 18:50 UTCGHSA enrichment
  8. 2026-10-02 06:31 UTCEG score recompute
  9. 2026-10-02 06:30 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 18:10 UTCGHSA enrichment
  12. 2026-10-01 05:45 UTCGHSA enrichment
  13. 2026-09-30 17:26 UTCGHSA enrichment
  14. 2026-09-30 16:16 UTCEG score recompute
  15. 2026-09-30 16:16 UTCGHSA enrichment
  16. 2026-09-30 15:02 UTCEPSS rescore
  17. 2026-09-30 03:43 UTCEG score recompute
  18. 2026-09-30 03:43 UTCGHSA enrichment
  19. 2026-09-29 15:23 UTCEG score recompute
  20. 2026-09-29 14:39 UTCEG score recompute
  21. 2026-09-29 14:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-102566?
CVE-2026-102566 is a high vulnerability published on September 29, 2026. CTranslate2 before 4.8.1 contains a heap-based buffer overflow in the binary model loader that fails to validate payload length against allocated buffer size. Attackers can craft malicious model files with oversized payload lengths to write past heap allocation boundaries, causing crashes or…
When was CVE-2026-102566 disclosed?
CVE-2026-102566 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102566 actively exploited?
CVE-2026-102566 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102566?
CVE-2026-102566 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102566?
A fix for CVE-2026-102566 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102566 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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