---
title: "CVE-2026-107183: llama.cpp - Use After Free"
description: "llama.cpp before b11393 contains a use-after-free and double free vulnerability caused by a dangling current_tool pointer in common_chat_peg_mapper::map, letting unauthenticated remote attackers corrupt heap memory via crafted POST /completion requests."
url: https://panop.io/threat-heartbeat/CVE-2026-107183/
---

# CVE-2026-107183 llama.cpp - Use After Free

llama.cpp before b11393 contains a use-after-free and double free vulnerability caused by a dangling current\_tool pointer in common\_chat\_peg\_mapper::map, letting unauthenticated remote attackers corrupt heap memory via crafted POST /completion requests.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.42% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107183)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to version b11393 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107183](https://nvd.nist.gov/vuln/detail/CVE-2026-107183)
- [https://github.com/ggml-org/llama.cpp](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/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/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/commit/dbe4c3ed42343f0a7ba0fd7e808ffeaca404d29f)
- [https://github.com/ggml-org/llama.cpp/pull/29942](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](https://www.vulncheck.com/advisories/llama-cpp-before-b11393-use-after-free-via-common-chat-peg-mapper-chat-parser)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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