CVE-2026-43622: llama.cpp builds b1886 through b7445 contain a double free vulnerability in the LLaMA-Android JNI wrapper wher

Routine

HIGH 7.8UPGRADE

CVE-2026-43622 is a high-severity flaw (CVSS 7.8) affecting llama.cpp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

llama.cpp builds b1886 through b7445 contain a double free vulnerability in the LLaMA-Android JNI wrapper where new_1batch() allocates memory using malloc() while free_1batch() deallocates it using the C++ delete operator, causing heap metadata corruption. Attackers can trigger this memory management mismatch to cause denial of service through process crashes or potentially achieve arbitrary code execution depending on allocator state.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-415, CWE-762
Published	2026-08-06
Last modified	2026-10-23

Publisher (CNA): VulnCheck · Vendor: ggml

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-06 16:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated Record last modified

ggml llama.cpp UPGRADE

Affected: >= b1886 and <= b7445

Fixed in: newer than b7445

Safe to downgrade to: a release before b1886

1. Check installed version

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

2. UPGRADE to newer than b7445 (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 b1886 (Debian / Ubuntu)

apt-cache madison llama.cpp sudo apt install llama.cpp=<VERSION_BEFORE_b1886> 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_b1886> 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 · uv · FIXED · 0.13.5-2.fc46 · FEDORA-2026-0a45cde16b · source

sudo dnf upgrade --advisory=FEDORA-2026-0a45cde16b

Fedora ELN · oo7 · FIXED · 0.7.0~beta-3.eln159 · FEDORA-2026-f348262964 · source

sudo dnf upgrade --advisory=FEDORA-2026-f348262964

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-2026-43622?

llama.cpp: upgrade to newer than b7445. Exact commands for each OS are on this page.

Is CVE-2026-43622 being exploited?

CVE-2026-43622 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-2026-43622 affect?

CVE-2026-43622 affects llama.cpp. Severity is high (CVSS 7.8). llama.cpp builds b1886 through b7445 contain a double free vulnerability in the LLaMA-Android JNI wrapper where new_1batch() allocates memory using malloc() while free_1batch() deallocates it using the C++ delete operator, causing heap meta

How urgent is CVE-2026-43622?

Priority 31/100. High severity

Software pages

Android vulnerabilities · OpenAI and LLM tools vulnerabilities

Related CVEs

CVE-2026-70640 HIGH 7.0 UPGRADE llama.cpp builds b1886 through b7445 contain a race condition use-after-free vulnerability in the LLaMA-Androi
CVE-2026-70638 HIGH 7.8 UPGRADE llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrappe
CVE-2026-70639 MEDIUM 5.5 UPGRADE llama.cpp builds b1886 through b7445 contain a null pointer dereference vulnerability in the LLaMA-Android JNI
CVE-2026-43629 HIGH 8.1 UPGRADE llama.cpp builds b4882 through b9058 contain a heap buffer overflow vulnerability in the KV cache state restor
CVE-2026-43631 HIGH 8.1 UPGRADE llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer o

References

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