🛡️ CVE-2026-56409 on Alpine — expat

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.

Distribution advisory

This page covers CVE-2026-56409 as tracked by Alpine, for the package expat. The fix is available in version 2.8.2-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Affected software

ALPINE-CVE-2026-56409 is recorded against 1 package.

  • expat (fixed in 2.8.2-r0)

Timeline and source

Published on 21 June 2026 and last revised on 29 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-21
Updated 2026-08-11
Modified 2026-06-29
Fix URL N/A

Affected Packages

Software From version Fixed in
expat — 2.8.2-r0

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