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CVE-2026-43632— llama.cpp b7492–b9060 Use-After-Free in Tokenization Endpoints

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，该漏洞源于释放后重用和时间检查使用时间竞争条件，可能导致崩溃或潜在代码执行。

CVSS 8.1 · High EPSS 0.48% · P39

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-2026-43632

Vulnerability Information
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Vulnerability Title
llama.cpp b7492–b9060 Use-After-Free in Tokenization Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
llama.cpp builds b7492 through the latest b9060 contains a use-after-free vulnerability in llama-server affecting six tokenization endpoints (/tokenize, /detokenize, /infill, /apply-template, /rerank, and /anthropic/count_tokens) that bypass the task queue and access ctx_server.vocab directly on HTTP worker threads. Attackers can exploit a time-of-check-time-of-use race condition where the main thread destroys and frees vocab after the synchronization lock is released but before the handler finishes using it, causing a crash or potential code execution when --sleep-idle-seconds is configured.
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，该漏洞源于释放后重用和时间检查使用时间竞争条件，可能导致崩溃或潜在代码执行。
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-2026-43632

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8669 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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III. Intelligence Information for CVE-2026-43632

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Patches & Fixes for CVE-2026-43632 (1)

Vendor Advisories for CVE-2026-43632 (1)

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

CVE-2026-43631 8.1 HIGH llama.cpp b7492–b9060 Use-After-Free RCE via llama-server
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-2026-43632

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