Out-of-bounds Read in Opennmt Ctranslate2
CVE-2026-102567
CTranslate2 before 4.8.1 contains an out-of-bounds heap read vulnerability in the binary model loader when deserializing string fields without null terminators. Attackers can craft malicious model files to trigger heap memory reads past buffer boundaries, causing crashes or disclosing adjacent heap memory contents.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/OpenNMT/CTranslate2/pull/2068 (issue-tracking, patch)
- github.com/OpenNMT/CTranslate2/commit/d9b991e0700933a0c05373df8b52ed89cdcab96d (patch)
- github.com/OpenNMT/CTranslate2/blob/v4.8.0/src/models/model.cc (technical-description)
- github.com/OpenNMT/CTranslate2/releases/tag/v4.8.1 (release-notes)
- github.com/OpenNMT/CTranslate2 (product)
- www.vulncheck.com/advisories/ctranslate2-before-4.8.1-out-of-bounds-read-via-mo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-102567?
- CVE-2026-102567 is a medium-severity vulnerability in Opennmt Ctranslate2, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-09-29.
- How severe is CVE-2026-102567?
- Medium severity. CVSS v3 base score is 6.1 out of 10.