| Name | CVE-2026-102633 |
| Description | libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6566-1 |
| Debian Bugs | 1149507 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| expat (PTS) | bookworm | 2.5.0-1+deb12u2 | vulnerable |
| bookworm (security) | 2.5.0-1+deb12u4 | vulnerable |
| trixie | 2.8.3-1~deb13u1 | vulnerable |
| trixie (security) | 2.9.0-1~deb13u1 | fixed |
| forky, sid | 2.9.0-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[bookworm] - expat <postponed> (Minor issue; CVE-2025-59375 back-port code is compiled out, XML_GE unset)
https://github.com/libexpat/libexpat/pull/1392
Fixed by: https://github.com/libexpat/libexpat/commit/69edbec09f2cd3e0bd6e0a093b55ea38af902d7d (R_2_9_0)