CVE-2026-27940: Integer overflow in llama.cpp gguf parser
llama.cpp
An integer overflow in llama.cpp leads to an undersized heap allocation during GGUF file initialization. This allows attacker-controlled data to overflow the buffer boundary, which was addressed in version b8146.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- CVSS
- 7.8
- EPSS
- <0.01 · top 89% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 12 Mar 2026
- last update
- 12 Mar 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-03-12CVE-2026-27940: llama.cpp is an inference of several LLM models in C/C++.NVD · nvd.nist.gov/vuln/detail/CVE-2026-27940
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerability
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- no technique for these categories
- dates
- happened 12 Mar 2026 · first reported 12 Mar 2026
- origin
- NVDVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
Copy a brief
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the brief as text
# CVE-2026-27940: Integer overflow in llama.cpp gguf parser https://gcdradar.vercel.app/incidents/cve-2026-27940-integer-overflow-in-llama-cpp-gguf-parser · AIR-2026-0987 · closed 2026-03-12 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-03-12 - AI role: Attack on AI - Products: llama.cpp - CVE ids: CVE-2026-27940 - CVSS: 7.8 ## Summary An integer overflow in llama.cpp leads to an undersized heap allocation during GGUF file initialization. This allows attacker-controlled data to overflow the buffer boundary, which was addressed in version b8146. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-03-12: CVE-2026-27940: llama.cpp is an inference of several LLM models in C/C++. (https://nvd.nist.gov/vuln/detail/CVE-2026-27940) ## Sources - 2026-03-12 NVD: CVE-2026-27940: llama.cpp is an inference of several LLM models in C/C++. https://nvd.nist.gov/vuln/detail/CVE-2026-27940 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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AI