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CVE-2026-43631— llama.cpp b7492–b9060 Use-After-Free RCE via llama-server

Quick assessment

Affected
ggml-org llama.cpp
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ggml llama.cpp是ggml组织的一个在本地执行大语言模型推理的引擎。 ggml llama.cpp b7492版本至b9060版本存在安全漏洞，该漏洞源于启用--sleep-idle-seconds功能时llama-server的vocab指针存在释放后重用漏洞，可能导致未经身份验证的远程攻击者执行任意代码。

CVSS 8.1 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
ggml-org llama.cpp b7492≤ b9060 affected
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I. Basic Information for CVE-2026-43631

Vulnerability Information
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Vulnerability Title
llama.cpp b7492–b9060 Use-After-Free RCE via llama-server
Source: CVE Program / CVE List V5
Vulnerability Description
llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in the vocab pointer of llama-server when the --sleep-idle-seconds feature is enabled, allowing unauthenticated remote attackers to execute arbitrary code. Attackers can trigger the vulnerability by sending requests to affected endpoints while the server transitions to sleep mode, causing concurrent worker threads to dereference a freed vocab pointer that can be reclaimed with attacker-controlled data to achieve remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
ggml llama.cpp 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ggml llama.cpp是ggml组织的一个在本地执行大语言模型推理的引擎。 ggml llama.cpp b7492版本至b9060版本存在安全漏洞，该漏洞源于启用--sleep-idle-seconds功能时llama-server的vocab指针存在释放后重用漏洞，可能导致未经身份验证的远程攻击者执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ggml-org llama.cpp b7492 ~ b9060 -

II. Public POCs for CVE-2026-43631

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8252 chars
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III. Intelligence Information for CVE-2026-43631

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Patches & Fixes for CVE-2026-43631 (1)

News Coverage for CVE-2026-43631 (1)

Same Patch Batch · ggml-org · 2026-08-06 · 10 CVEs total

CVE-2026-43632 8.1 HIGH llama.cpp b7492–b9060 Use-After-Free in Tokenization Endpoints
CVE-2026-43629 8.1 HIGH llama.cpp b4882–b9058 Buffer Overflow in KV Cache State Restore
CVE-2026-43622 7.8 HIGH llama.cpp b1886–b7445 Double Free via llama-android.cpp
CVE-2026-43627 7.8 HIGH llama.cpp b1283–b9058 Integer Overflow in llama_batch_init() Function
CVE-2026-43628 7.8 HIGH llama.cpp b3978–b9058 Integer Underflow via DRY Sampler
CVE-2026-70638 7.8 HIGH llama.cpp b1886–b7445 Integer Overflow via new_1batch() in llama-android.cpp
CVE-2026-70640 7.0 HIGH llama.cpp b1886–b7445 Race Condition Use-After-Free via llama-android.cpp
CVE-2026-43630 6.5 MEDIUM llama.cpp b5702–b7653 Out-of-Bounds Read Information Disclosure
CVE-2026-70639 5.5 MEDIUM llama.cpp b1886–b7445 Null Pointer Dereference DoS via llama-android.cpp

IV. Related Vulnerabilities

Same product: llama.cpp
Same vendor: ggml-org
Same weakness: CWE-416

V. Comments for CVE-2026-43631

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