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CVE-2026-70639— llama.cpp b1886–b7445 Null Pointer Dereference DoS via llama-android.cpp

Quick assessment

Affected
ggml-org llama.cpp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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-org llama.cpp b1886版本至b7445版本存在异常处理不当漏洞，该漏洞源于LLaMA-Android JNI包装器中的bench_1model()函数在解引用模型上下文指针之前未验证该指针，攻击者可通过提供恶意、损坏或截断的模型文件触发空上下文条件，导致SIGSEGV崩溃，终止Android应用程序进程，造成拒绝服务。

CVSS 5.5 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
ggml-org llama.cpp b1886≤ b7445 affected
0.9.0≤ 0.17.1 affected
5c0d18881e0e9794c96b2602736b758bac9d9388 unaffected
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I. Basic Information for CVE-2026-70639

Vulnerability Information
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Vulnerability Title
llama.cpp b1886–b7445 Null Pointer Dereference DoS via llama-android.cpp
Source: CVE Program / CVE List V5
Vulnerability Description
llama.cpp builds b1886 through b7445 contain a null pointer dereference vulnerability in the LLaMA-Android JNI wrapper where the bench_1model() function fails to validate the model context pointer before dereferencing it. Attackers can supply a malicious, corrupt, or truncated model file to trigger a null context condition, causing a SIGSEGV crash that terminates the Android application process and results in denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
ggml-org llama.cpp 异常处理不当漏洞
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-org llama.cpp b1886版本至b7445版本存在异常处理不当漏洞，该漏洞源于LLaMA-Android JNI包装器中的bench_1model()函数在解引用模型上下文指针之前未验证该指针，攻击者可通过提供恶意、损坏或截断的模型文件触发空上下文条件，导致SIGSEGV崩溃，终止Android应用程序进程，造成拒绝服务。
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 b1886 ~ b7445 -

II. Public POCs for CVE-2026-70639

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III. Intelligence Information for CVE-2026-70639

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Patches & Fixes for CVE-2026-70639 (1)

Vendor Pages for CVE-2026-70639 (1)

Other References for CVE-2026-70639 (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-2026-43628 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

IV. Related Vulnerabilities

Same product: llama.cpp
Same vendor: ggml-org
Same weakness: CWE-476

V. Comments for CVE-2026-70639

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