CVE-2026-128241

Description

The xmlwf tool in libexpat through 2.10.0 contains a symlink following vulnerability because -d output mode opens files with fopen("wb"), which follows symbolic links. Local attackers with write access to the output directory can plant a symlink at the expected output name to truncate or overwrite files writable by the xmlwf user.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 4.1CVSS 4.0, Mediumfrom the CNA (VulnCheck)CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
• 4.4CVSS 3.1, Mediumfrom the CNA (VulnCheck)CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 13 Nov 2026 Published

Weakness

• CWE-59

References

• github.compatchissue-tracking
• github.comtechnical-description
• github.comtechnical-description
• github.comproduct
• VulnCheck Advisory: libexpat xmlwf through 2.10.0 Symlink Following via -d Output Directorythird-party-advisory