CVE-2026-43627llama.cpp b1283–b9058 Integer Overflow in llama_batch_init() Function
Updated under an hour ago ()
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It affects ggml-org llama.cpp and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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llama.cpp builds b1283 through b9058 contain an integer overflow vulnerability in the llama_batch_init() function where unchecked multiplications in malloc() calls can wrap past INT32_MAX when computing allocation sizes. Attackers can pass specially crafted parameters to trigger integer overflow, causing heap corruption and potentially achieving arbitrary code execution through subsequent batch operations that write past allocated buffer boundaries.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-190, CWE-680
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ggml-org llama.cpp ggml_org:llama.cpp (from the name) | from b1283 through b9058; from 0.4.0 through 0.17.1 | CNA record |
ggml llama.cpp ggml:llama.cpp | from b1283 through b9058 | NVD |
References
- https://github.com/Vladimir-tokarev-cyera/llama-cpp-security-patchesmitigation, patch, third-party-advisory
- https://www.vulncheck.com/advisories/llama-cpp-b1283-b9058-integer-overflow-in-llama-batch-init-functionthird-party-advisory, mitigation, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.