CVE-Katalog

CVE-2026-76956

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 s

[CVE-Katalog]

Schweregrad: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Aug 19, 2026, 10:00:00 PM UTC
Updated: Aug 20, 2026, 5:16:29 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.29% · Oct 22, 2026

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	expat	sid	`2.9.0-1`	fixed
Debian	expat	forky	`2.9.0-1`	fixed
Debian	expat	trixie	`2.8.3-1~deb13u1`	vulnerable
Debian	expat	trixie-security	`2.9.0-1~deb13u1`	fixed
Debian	expat	bookworm	`2.5.0-1+deb12u2`	not affected
Debian	expat	bookworm-security	`2.5.0-1+deb12u5`	not affected
Cpe	libexpat	Not reported	`2.8.4`	fixed
Alpine	expat	3.21	`2.8.4-r0`	fixed
Alpine	expat	3.22	`2.8.4-r0`	fixed
Alpine	expat	3.23	`2.8.4-r0`	fixed
Alpine	expat	3.24	`2.8.4-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	expat	source	sid	`2.8.4-1`	not yet assigned	Not reported	[1144926]
Debian	expat	source	forky	`2.8.4-1`	not yet assigned	Not reported	[1144926]
Debian	expat	source	trixie	`2.9.0-1~deb13u1`	not yet assigned	Not reported	[1144926]
Debian	expat	source	bookworm	`Not affected`	unimportant	Not reported	[1144926]
Cpe	libexpat	cpe	Not reported	`2.8.4`	Not reported	NVD-CVE-2026-76956	Not reported
Alpine	expat	apk	3.21	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76956	Not reported
Alpine	expat	apk	3.22	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76956	Not reported
Alpine	expat	apk	3.23	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76956	Not reported
Alpine	expat	apk	3.24	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76956	Not reported

[Debian bug #1144926]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[expat]Nicht betroffen
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm
[libexpat1]Nicht betroffen
Quellpaket: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm
[libexpat1-dev]Nicht betroffen
Quellpaket: [expat]
Details (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Nicht betroffen
  nvd · expat · debian · bookworm

Beobachtet: Oct 24, 2026, 4:20:25 AM UTC

Referenzen

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]