PatchTheCEVCVE-2026-43631: llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer o
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HIGH 8.1REMOTEUPGRADE
CVE-2026-43631 is a high-severity flaw (CVSS 8.1) affecting llama.cpp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
ggml llama.cpp UPGRADE
Affected: >= b7492 and <= b9060
Fixed in: newer than b9060
Safe to downgrade to: a release before b7492
1. Check installed version
apt-cache policy llama.cpp || rpm -q llama.cpp || llama.cpp --version
2. UPGRADE to newer than b9060 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade llama.cpp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade llama.cpp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before b7492 (Debian / Ubuntu)
apt-cache madison llama.cpp
sudo apt install llama.cpp=<VERSION_BEFORE_b7492>
sudo apt-mark hold llama.cpp
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list llama.cpp
sudo dnf downgrade llama.cpp-<VERSION_BEFORE_b7492>
sudo dnf versionlock add llama.cpp
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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