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CVE-2026-43628

CVE-2026-43628 · llama.cpp b3978–b9058 Integer Underflow via DRY Sampler

This page contains facts from public vulnerability sources. Check the original advisory before updating.

llama.cpp builds b3978 through b9058 contain an integer underflow and out-of-bounds read vulnerability in the DRY sampler that allows unauthenticated attackers to trigger a heap buffer underflow by sending a crafted HTTP request with dry_allowed_length set to INT32_MIN to the /v1/completions or /v1/chat/completions endpoints. Attackers can exploit this vulnerability to crash the server with SIGSEGV causing denial of service for all connected users, or corrupt token sampling probabilities by reading garbage values from memory before the allocated buffer.

CVSS 8.5 · High · EPSS 0.2%

Published
Updated

Stack: system

Affected products and versions

  • llama.cpp

    Versions
    • ≥ b3978, ≤ b9058: Affected (custom)
    • ≥ 0.11.0, ≤ 0.17.1: Affected (semver)

    No fix published

  • llama.cpp Debian:14

    Versions
    • 10108+dfsg-1
    • 10108+dfsg1-1
    • 10108+dfsg1-2
    • 10192+dfsg-1
    • 10192+dfsg-2
    • 10192+dfsg-2~exp1
    • 10271+dfsg-1
    • 10344+dfsg-1
    • 10438+dfsg-1
    • 1:0.1.2+dfsg-1~exp1
    • 1:0.2.0+dfsg1-1
    • 1:0.2.0+dfsg1-1~exp1
    • 1:0.4.0+dfsg-1
    • 1:0.4.1+dfsg-1
    • 1:0.5.0+dfsg-1
    • 1:0.5.0+dfsg-2
    • 1:0.6.0+dfsg-1
    • 1:0.6.0+dfsg-2
    • 1:0.7.0+dfsg-1
    • 1:0.7.0+dfsg-2
    • 5151+dfsg-1~exp2
    • 5151+dfsg-1~exp3
    • 5318+dfsg-1
    • 5318+dfsg-2
    • 5713+dfsg-1
    • 5760+dfsg-1
    • 5760+dfsg-2
    • 5760+dfsg-3
    • 5760+dfsg-4
    • 5882+dfsg-1
    • 5882+dfsg-2
    • 5882+dfsg-3
    • 5882+dfsg-3~exp1
    • 5882+dfsg-3~exp2
    • 5882+dfsg-3~exp3
    • 5882+dfsg-4
    • 6641+dfsg-1
    • 6641+dfsg-2
    • 6641+dfsg-3
    • 7593+dfsg-1
    • 7593+dfsg-2
    • 7593+dfsg-3
    • 7965+dfsg-1
    • 8064+dfsg-1
    • 8064+dfsg-2
    • 8461+dfsg-1
    • 8611+dfsg-1
    • 8681+dfsg-1
    • 8870+dfsg-1
    • 8941+dfsg-1
    • 9009+dfsg-1
    • 9071+dfsg-1
    • 9190+dfsg-1
    • 9413+dfsg-1
    • 9555+dfsg-1
    • 9601+dfsg-1
    • 9721+dfsg-1
    • 9895+dfsg-1
    • 9895+dfsg-2
    • 9895+dfsg-3
    • 9951+dfsg-1
    • 9951+dfsg-2
    • 9951+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • llama.cpp Ubuntu:26.10

    Versions
    • 8681+dfsg-1
    • 9721+dfsg-1ubuntu1
    • 10438+dfsg-1
    • 10438+dfsg-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • llama.cpp Ubuntu:26.04:LTS

    Versions
    • 5882+dfsg-2
    • 8064+dfsg-1ubuntu1
    • 8681+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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