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CVE-2026-70638— llama.cpp b1886–b7445 Integer Overflow via new_1batch() in llama-android.cpp

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 b1886至b7445版本存在安全漏洞，该漏洞源于LLaMA-Android JNI封装中的new_1batch()函数在未进行溢出验证的情况下，将sizeof(llama_seq_id)与攻击者控制的n_seq_max参数相乘，导致堆缓冲区分配回绕并分配不足内存，攻击者可通过恶意模型文件或JNI调用提供特制的n_seq_max值，触发堆破坏，导致拒绝服务或任意代码执行。

CVSS 7.8 · High EPSS 0.23% · P13

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-2026-70638

Vulnerability Information
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Vulnerability Title
llama.cpp b1886–b7445 Integer Overflow via new_1batch() in llama-android.cpp
Source: CVE Program / CVE List V5
Vulnerability Description
llama.cpp builds b1886 through b7445 contain an integer overflow vulnerability in the LLaMA-Android JNI wrapper where the new_1batch() function multiplies sizeof(llama_seq_id) by an attacker-controlled n_seq_max parameter without overflow validation, causing heap buffer allocation to wrap and allocate insufficient memory. Attackers can exploit this by providing a crafted n_seq_max value through a malicious model file or JNI call to trigger heap corruption and achieve denial of service or arbitrary code execution on Android applications using the LLaMA-Android binding.
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
整数溢出或超界折返
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 b1886至b7445版本存在安全漏洞，该漏洞源于LLaMA-Android JNI封装中的new_1batch()函数在未进行溢出验证的情况下，将sizeof(llama_seq_id)与攻击者控制的n_seq_max参数相乘，导致堆缓冲区分配回绕并分配不足内存，攻击者可通过恶意模型文件或JNI调用提供特制的n_seq_max值，触发堆破坏，导致拒绝服务或任意代码执行。
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 b1886 ~ b7445 -

II. Public POCs for CVE-2026-70638

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12031 chars
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III. Intelligence Information for CVE-2026-70638

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Patches & Fixes for CVE-2026-70638 (1)

Vendor Advisories for CVE-2026-70638 (1)

Vendor Pages for CVE-2026-70638 (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-2026-70640 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-190

V. Comments for CVE-2026-70638

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