What’s Vulnerable › Vulnerabilities

CVE-2026-102566: CTranslate2 before 4.8.1 Heap Buffer Overflow via model.bin

• Severity: high (CVSS 7.8 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-787

Description

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.

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#L656-L657
• 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-heap-buffer-overflow-via-model-bin

Get alerted when CVE-2026-102566 or the next vulnerability affects your stack