CVE-2026-128241
libexpat xmlwf through 2.10.0 Symlink Following via -d Output Directory
CVSS Score
4.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-59 |
| Vendor | libexpat project |
| Product | libexpat |
| Published | Nov 13, 2026 |
Stay Ahead of the Next One
Get instant alerts for libexpat project libexpat
Be the first to know when new medium vulnerabilities affecting libexpat project libexpat are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
libexpat project / libexpat
0 ≤ 2.10.0
References
github.com: https://github.com/libexpat/libexpat/pull/1502 github.com: https://github.com/libexpat/libexpat/blob/R_2_10_0/expat/xmlwf/xmlwf.c#L1272-L1275 github.com: https://github.com/libexpat/libexpat/blob/R_2_10_0/expat/xmlwf/xmlwf.c#L1338-L1347 github.com: https://github.com/libexpat/libexpat vulncheck.com: https://www.vulncheck.com/advisories/libexpat-xmlwf-through-2.10.0-symlink-following-via-d-output-directory
Credits
Aziz Elbelaychy Sebastian Pipping