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Public proof of conceptFix available

CVE-2026-34159

A public proof of concept exists; no exploitation attested.

  • Published2026-04-01
  • Fixed inb8492
  • WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.

Timeline

dates in UTC
  1. 2026-04-0118:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34159?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34159?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Ggml llama.cpp
BranchAffectedFixed in
—< b8492b8492

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Ggml llama.cpp to b8492

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedcasp3r0x0/CVE-2026-34159rohithronanki/CVE-2026-34159-Vulnerability-Research-Analysis-DetectionTeamN4C/SG-2026-0021
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-04-01
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.19.8read 2026-10-23
  • CNAweakness (CWE)CWE-119read 2026-10-23
  • FIRST EPSSEPSS score1.2 %2026-10-23
  • PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-04-01
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-34159?

llama.cpp is an inference of several LLM models in C/C++. Prior to version b8492, the RPC backend's deserialize_tensor() skips all bounds validation when a tensor's buffer field is 0. An unauthenticated attacker can read and write arbitrary process memory via crafted GRAPH_COMPUTE messages. Combined with pointer leaks from ALLOC_BUFFER/BUFFER_GET_BASE, this gives full ASLR bypass and remote code execution. No authentication required, just TCP access to the RPC server port. This issue has been patched in version b8492.

Is CVE-2026-34159 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34159, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34159?

CVE-2026-34159 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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