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CVE-2026-43631

CVE-2026-43631 · llama.cpp b7492–b9060 Use-After-Free RCE via llama-server

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

llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending requests to affected endpoints while the server transitions to sleep mode, causing concurrent worker threads to dereference a freed vocab pointer that can be reclaimed with attacker-controlled data to achieve remote code execution.

CVSS 9.2 · Critical · EPSS 0.6%

Published
Updated

Stack: system

Affected products and versions

  • llama.cpp

    Versions
    • ≥ b7492, ≤ b9060: Affected (custom)

    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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