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CVE-2026-111131— libxmp through 4.7.4 Stack Out-of-Bounds Read via P61A Depacker

Quick assessment

Affected
libxmp libxmp
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.

libxmp 4.7.4 及之前版本中存在一个栈上越界读取漏洞（off-by-one stack out-of-bounds read）。该漏洞位于 src/loaders/prowizard/p61a.c 文件中的 prowizard P61A 解包器 depack_p61a() 函数里。攻击者可以构造一个无头的 P61A 模块，其中包含 31 个样本样本以及一个值为 0xffe0 的回引大小字段（back-reference size word），从而将栈内存中的数据泄露到样本元数据中，或破坏模块的加载过程。

CVSS 6.1 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1023

Affected Version Matrix 1

VendorProduct Version RangeStatus
libxmp libxmp ≤ 4.7.4 affected
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I. Basic Information for CVE-2026-111131

Vulnerability Information
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Vulnerability Title
libxmp through 4.7.4 Stack Out-of-Bounds Read via P61A Depacker
Source: CVE Program / CVE List V5
Vulnerability Description
libxmp through 4.7.4 contains an off-by-one stack out-of-bounds read vulnerability in the prowizard P61A depacker depack_p61a() in src/loaders/prowizard/p61a.c. Attackers can supply a crafted headerless P61A module with 31 samples and a 0xffe0 back-reference size word to leak stack memory into sample metadata or disrupt loading.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libxmp libxmp 0 ~ 4.7.4 -

II. Public POCs for CVE-2026-111131

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III. Intelligence Information for CVE-2026-111131

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Vendor Advisories for CVE-2026-111131 (1)

Proof of Concept for CVE-2026-111131 (1)

Vendor Pages for CVE-2026-111131 (1)

IV. Related Vulnerabilities

Same product: libxmp
Same vendor: libxmp
Same weakness: CWE-125

V. Comments for CVE-2026-111131

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