| Name | CVE-2026-115506 |
| Description | libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse. |
| 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) |
| Debian Bugs | 1151841 |
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+deb12u5 | vulnerable |
| trixie | 2.8.3-1~deb13u1 | vulnerable |
| trixie (security) | 2.9.0-1~deb13u1 | vulnerable |
| forky, sid | 2.10.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| expat | source | (unstable) | 2.10.0-1 | | | 1151841 |
Notes
[trixie] - expat <no-dsa> (Minor issue)
[bookworm] - expat <postponed> (Minor issue, can be fixed in next update)
https://github.com/libexpat/libexpat/pull/1433