Bug 2547441 (CVE-2026-107183)

Summary: CVE-2026-107183 llama.cpp: llama.cpp: Arbitrary code execution via crafted completion request
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in llama.cpp. An unauthenticated remote attacker could exploit this vulnerability by submitting a specially crafted completion request with malformed chat parser parameters. Due to improper memory handling, this request triggers a use-after-free condition that corrupts memory. This flaw can potentially lead to arbitrary code execution or cause a Denial of Service (DoS) by crashing the server.
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Description OSIDB Bzimport 2026-10-07 13:52:11 UTC 
llama.cpp before b11393 contains a use-after-free and double free vulnerability in common_chat_peg_mapper::map that allows unauthenticated remote attackers to corrupt heap memory via a dangling current_tool pointer. Attackers can submit a chat_parser in a POST /completion request emitting a tool-id after a tool-close tag to crash llama-server and shape a heap write primitive.