What’s Vulnerable › Vulnerabilities

CVE-2026-102567: CTranslate2 before 4.8.1 Out-of-Bounds Read via Model Deserialization

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-29 · updated 2026-09-30
• Weakness: CWE-125

Description

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.

Affected products

• OpenNMT CTranslate2: before 4.8.1 — fixed in 4.8.1

How to fix

Upgrade to a fixed version: OpenNMT CTranslate2 4.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/OpenNMT/CTranslate2
• https://github.com/OpenNMT/CTranslate2/blob/v4.8.0/src/models/model.cc#L81-L87
• https://github.com/OpenNMT/CTranslate2/commit/d9b991e0700933a0c05373df8b52ed89cdcab96d
• https://github.com/OpenNMT/CTranslate2/pull/2068
• https://github.com/OpenNMT/CTranslate2/releases/tag/v4.8.1
• https://www.vulncheck.com/advisories/ctranslate2-before-4.8.1-out-of-bounds-read-via-model-deserialization

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