CVE-2026-43630: llama.cpp builds b4882 before b8487 contain an out-of-bounds read vulnerability in the recurrent memory state

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-43630 is a medium-severity flaw (CVSS 6.5) affecting llama.cpp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

llama.cpp builds b4882 before b8487 contain an out-of-bounds read vulnerability in the recurrent memory state restore path that allows attackers with write access to the slot save directory to read memory past the end of the allocated cells array. Attackers can craft a malicious slot file with an oversized seq_id value to trigger an out-of-bounds read that leaks heap data including pointer values into server logs, defeating ASLR protections and f

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-125, CWE-209
Published	2026-08-06
Last modified	2026-10-22

Publisher (CNA): VulnCheck · Vendor: ggml

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-06Published CVE record published
2026-10-22 19:17 UTCUpdated Record last modified

ggml llama.cpp UPGRADE

Affected: >= b5702 and <= b7653

Fixed in: newer than b7653

Safe to downgrade to: a release before b5702

1. Check installed version

apt-cache policy llama.cpp || rpm -q llama.cpp || llama.cpp --version

2. UPGRADE to newer than b7653 (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 b5702 (Debian / Ubuntu)

apt-cache madison llama.cpp sudo apt install llama.cpp=<VERSION_BEFORE_b5702> 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_b5702> 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.

Exact fixes by distribution

Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source

sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39

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.

Quick answers

How do I fix CVE-2026-43630?

llama.cpp: upgrade to newer than b7653. Exact commands for each OS are on this page.

Is CVE-2026-43630 being exploited?

CVE-2026-43630 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43630 affect?

CVE-2026-43630 affects llama.cpp. Severity is medium (CVSS 6.5). llama.cpp builds b4882 before b8487 contain an out-of-bounds read vulnerability in the recurrent memory state restore path that allows attackers with write access to the slot save directory to read memory past the end of the allocated cells

How urgent is CVE-2026-43630?

Priority 38/100. Remotely exploitable, no login, no user action

Software pages

OpenAI and LLM tools vulnerabilities

Related CVEs

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CVE-2026-70639 MEDIUM 5.5 UPGRADE llama.cpp builds b1886 through b7445 contain a null pointer dereference vulnerability in the LLaMA-Android JNI
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References

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