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CVE-2026-43628— llama.cpp b3978–b9058 Integer Underflow via DRY Sampler

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 b3978版本至b9058版本存在安全漏洞，该漏洞源于DRY采样器存在整数下溢和越界读取问题，攻击者可通过向/v1/completions或/v1/chat/completions端点发送dry_allowed_length设置为INT32_MIN的特制HTTP请求，触发堆缓冲区下溢，可能导致服务器崩溃并拒绝服务，或通过读取内存垃圾值破坏token采样概率。

CVSS 7.8 · High EPSS 0.23% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
ggml-org llama.cpp b3978≤ b9058 affected
0.11.0≤ 0.17.1 affected
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I. Basic Information for CVE-2026-43628

Vulnerability Information
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Vulnerability Title
llama.cpp b3978–b9058 Integer Underflow via DRY Sampler
Source: CVE Program / CVE List V5
Vulnerability Description
llama.cpp builds b3978 through b9058 contain an integer underflow and out-of-bounds read vulnerability in the DRY sampler that allows unauthenticated attackers to trigger a heap buffer underflow by sending a crafted HTTP request with dry_allowed_length set to INT32_MIN to the /v1/completions or /v1/chat/completions endpoints. Attackers can exploit this vulnerability to crash the server with SIGSEGV causing denial of service for all connected users, or corrupt token sampling probabilities by reading garbage values from memory before the allocated buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
ggml llama.cpp 缓冲区错误漏洞
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 b3978版本至b9058版本存在安全漏洞，该漏洞源于DRY采样器存在整数下溢和越界读取问题，攻击者可通过向/v1/completions或/v1/chat/completions端点发送dry_allowed_length设置为INT32_MIN的特制HTTP请求，触发堆缓冲区下溢，可能导致服务器崩溃并拒绝服务，或通过读取内存垃圾值破坏token采样概率。
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 b3978 ~ b9058 -

II. Public POCs for CVE-2026-43628

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9111 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-43628

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Patches & Fixes for CVE-2026-43628 (1)

Vendor Advisories for CVE-2026-43628 (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-2026-43631 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-2026-70638 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-191

V. Comments for CVE-2026-43628

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