| Name | CVE-2026-76956 |
| Description | In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content. |
| 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 | 1144926 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| expat (PTS) | bookworm | 2.5.0-1+deb12u2 | fixed |
| bookworm (security) | 2.5.0-1+deb12u3 | fixed | |
| trixie | 2.7.1-2 | vulnerable | |
| trixie (security) | 2.8.3-1~deb13u1 | vulnerable | |
| forky, sid | 2.8.4-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| expat | source | bullseye | (not affected) | |||
| expat | source | bookworm | (not affected) | |||
| expat | source | (unstable) | 2.8.4-1 | 1144926 |
[trixie] - expat <no-dsa> (Minor issue)
[bookworm] - expat <not-affected> (Vulnerable code not present)
[bullseye] - expat <not-affected> (Vulnerable code not present)
https://github.com/libexpat/libexpat/pull/1326
Introduced with: https://github.com/libexpat/libexpat/commit/c90f80c10c08c095221d78c2964697d842ea087b (R_2_8_2)
Fixed by: https://github.com/libexpat/libexpat/commit/40daa9996d616e66a75dea41ed2b18f2c3901b9f (R_2_8_4)