Catalogo CVE

CVE-2026-76641

Gravità: High · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Aug 10, 2026, 4:16:50 AM UTC
Updated: Aug 20, 2026, 6:16:51 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.35% · Oct 22, 2026

Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.

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`	not affected
Debian	expat	forky	`2.9.0-1`	not affected
Debian	expat	trixie	`2.8.3-1~deb13u1`	not affected
Debian	expat	trixie-security	`2.9.0-1~deb13u1`	not affected
Debian	expat	bookworm	`2.5.0-1+deb12u2`	not affected
Debian	expat	bookworm-security	`2.5.0-1+deb12u5`	not affected
Ubuntu	expat	noble	`2.6.1-2ubuntu0.6`	fixed
Ubuntu	libexpat1	noble	`2.6.1-2ubuntu0.6`	fixed
Ubuntu	libexpat1-dev	noble	`2.6.1-2ubuntu0.6`	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	`Not affected`	unimportant	Not reported	Not reported
Debian	expat	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	expat	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	expat	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Ubuntu	expat	deb	noble	`2.6.1-2ubuntu0.6`	Not reported	Not reported	Not reported
Ubuntu	libexpat1	deb	noble	`2.6.1-2ubuntu0.6`	Not reported	Not reported	Not reported
Ubuntu	libexpat1-dev	deb	noble	`2.6.1-2ubuntu0.6`	Not reported	Not reported	Not reported
Alpine	expat	apk	3.21	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76641	Not reported
Alpine	expat	apk	3.22	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76641	Not reported
Alpine	expat	apk	3.23	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76641	Not reported
Alpine	expat	apk	3.24	`2.8.4-r0`	Not reported	ALPINE-CVE-2026-76641	Not reported

OpenFactory catalog packages

L’associazione dei pacchetti è in corso.

[Debian 12 (Bookworm)]

[expat]Sconosciuto
Dettagli (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm
[libexpat1]Sconosciuto
Pacchetto sorgente: [expat]
Dettagli (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm
[libexpat1-dev]Sconosciuto
Pacchetto sorgente: [expat]
Dettagli (4)
- 2.5.0-1+deb12u2 · amd64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u2 · arm64 · bookworm
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · amd64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm
- 2.5.0-1+deb12u3 · arm64 · bookworm-security
  Non interessata
  nvd · expat · debian · bookworm

Osservato: Oct 23, 2026, 9:42:28 PM UTC

Riferimenti

[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] · [Ubuntu Security Notices (USN)]