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CVE-2026-43632

CVE-2026-43632 · llama.cpp b7492–b9060 Use-After-Free in Tokenization Endpoints

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 llama-server affecting six tokenization endpoints (/tokenize, /detokenize, /infill, /apply-template, /rerank, and /anthropic/count_tokens) that bypass the task queue and access ctx_server.vocab directly on HTTP worker threads. Attackers can exploit a time-of-check-time-of-use race condition where the main thread destroys and frees vocab after the synchronization lock is released but before the handler finishes using it, causing a crash or potential code execution when --sleep-idle-seconds is configured.

CVSS 9.2 · Critical · EPSS 0.5%

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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