CVE-2026-34159: RCE Vulnerability in llama.cpp RPC Backend
llama.cpp
An unauthenticated remote code execution vulnerability exists in llama.cpp prior to version b8492 due to missing bounds validation in the RPC backend deserialize_tensor function. The vulnerability allows arbitrary process memory read and write, and has been patched in version b8492.
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
- 9.8
- EPSS
- 0.02 · top 24% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 1 Apr 2026
- last update
- 1 Apr 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-04-01CVE-2026-34159: llama.cpp is an inference of several LLM models in C/C++.NVD · nvd.nist.gov/vuln/detail/CVE-2026-34159
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 1 Apr 2026 · first reported 1 Apr 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
This record as a short Markdown brief, for a ticket, a chat or a coding agent.
the brief as text
# CVE-2026-34159: RCE Vulnerability in llama.cpp RPC Backend https://gcdradar.vercel.app/incidents/cve-2026-34159-rce-vulnerability-in-llama-cpp-rpc-backend · AIR-2026-1007 · closed 2026-04-01 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2026-04-01 - AI role: Attack on AI - Products: llama.cpp - CVE ids: CVE-2026-34159 - CVSS: 9.8 ## Summary An unauthenticated remote code execution vulnerability exists in llama.cpp prior to version b8492 due to missing bounds validation in the RPC backend deserialize_tensor function. The vulnerability allows arbitrary process memory read and write, and has been patched in version b8492. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2026-04-01: CVE-2026-34159: llama.cpp is an inference of several LLM models in C/C++. (https://nvd.nist.gov/vuln/detail/CVE-2026-34159) ## Sources - 2026-04-01 NVD: CVE-2026-34159: llama.cpp is an inference of several LLM models in C/C++. https://nvd.nist.gov/vuln/detail/CVE-2026-34159 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
Related
- closed7.8llama.cpp CVE-2026-33298: Integer overflow in llama.cpp allows remote code execution
Patch now · Disclosed · since 24 Mar 2026 · CVE-2026-33298
AI - closed7.8llama.cpp CVE-2026-27940: Integer overflow in llama.cpp gguf parser
Patch now · Disclosed · since 12 Mar 2026 · CVE-2026-27940
AI - closed6.9llama.cpp CVE-2026-86317: Assertion failure in ggml-org llama.cpp RPC server
Patch now · Disclosed · since 7 Sep 2026 · CVE-2026-86317
AI - closed7.5llama.cpp llama.cpp vulnerable to reachable assertion via gguf reader
Patch now · Disclosed · since 1 Sep 2026 · CVE-2026-52131
AI - closed7.5llama.cpp llama.cpp vulnerable to uncontrolled recursion and denial of service
Patch now · Disclosed · since 1 Sep 2026 · CVE-2026-52130
AI - closed7.5llama.cpp llama.cpp vulnerable to denial of service via negative top_n reranking value
Patch now · Disclosed · since 1 Sep 2026 · CVE-2026-52132
AI