What’s Vulnerable › Vulnerabilities

CVE-2026-107183: llama.cpp before b11393 Use-After-Free via common_chat_peg_mapper chat_parser

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-07 · updated 2026-10-07
• Weakness: CWE-416

Description

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.

Affected products

• ggml-org llama.cpp: from b8227 before b11393 — fixed in b11393

How to fix

Upgrade to a fixed version: ggml-org llama.cpp b11393. Check the vendor advisory for mitigations.

References

• https://github.com/ggml-org/llama.cpp
• https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/common/chat-peg-parser.cpp#L343-L355
• https://github.com/ggml-org/llama.cpp/blob/bed0a856606ee4a24a164066f73d2379447033f5/tools/server/server-schema.cpp#L321-L324
• https://github.com/ggml-org/llama.cpp/commit/dbe4c3ed42343f0a7ba0fd7e808ffeaca404d29f
• https://github.com/ggml-org/llama.cpp/pull/29942
• https://www.vulncheck.com/advisories/llama-cpp-before-b11393-use-after-free-via-common-chat-peg-mapper-chat-parser

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