CVE-Katalog
CVE-2026-56131
libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-502
- Schweregrad
- High · CVSS 8.7
CVSS: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
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 22, 2026
libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).
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 | fixed |
| Debian | expat | trixie-security | 2.9.0-1~deb13u1 | fixed |
| Debian | expat | bookworm | 2.5.0-1+deb12u2 | vulnerable |
| Debian | expat | bookworm-security | 2.5.0-1+deb12u5 | fixed |
| Cpe | expat | Not reported | Not reported | vulnerable |
| Cpe | libexpat | Not reported | 2.8.2 | fixed |
| 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 | 2.8.2-r0 | fixed |
| Alpine | expat | 3.22 | 2.8.2-r0 | fixed |
| Alpine | expat | 3.23 | 2.8.2-r0 | fixed |
| Alpine | expat | 3.24 | 2.8.2-r0 | fixed |
| Ubuntu | expat | pro | 2.2.7-2 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1build1 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.2 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.4 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.5 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.6 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.7 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.8 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.8+esm1 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.8+esm2 | vulnerable |
| Ubuntu | expat | pro | 2.2.9-1ubuntu0.8+esm3 | fixed |
| Ubuntu | expat | 22.04 | 2.4.1-2 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.1-3 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.2-1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.3-1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.3-2 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.4-1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.6-1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.1 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.2 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.3 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.4 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.5 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.6 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.7 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.8 | vulnerable |
| Ubuntu | expat | 22.04 | 2.4.7-1ubuntu0.9 | fixed |
| Ubuntu | expat | 24.04 | 2.5.0-2 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.0-1 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2build1 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.1 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.2 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.3 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.4 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.5 | vulnerable |
| Ubuntu | expat | 24.04 | 2.6.1-2ubuntu0.6 | fixed |
| Ubuntu | expat | 26.04 | 2.7.1-2 | vulnerable |
| Ubuntu | expat | 26.04 | 2.7.3-1 | vulnerable |
| Ubuntu | expat | 26.04 | 2.7.4-1 | vulnerable |
| Ubuntu | expat | 26.04 | 2.7.4-1ubuntu0.1 | vulnerable |
| Ubuntu | expat | 26.04 | 2.7.4-1ubuntu0.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | expat | source | sid | 2.8.2-1 | not yet assigned | Not reported | [1140387] |
| Debian | expat | source | forky | 2.8.2-1 | not yet assigned | Not reported | [1140387] |
| Debian | expat | source | trixie | 2.8.2-1~deb13u1 | not yet assigned | Not reported | [1140387] |
| Debian | expat | source | bookworm | 2.5.0-1+deb12u3 | not yet assigned | Not reported | [1140387] |
| Cpe | libexpat | cpe | Not reported | 2.8.2 | Not reported | 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 | 2.8.2-r0 | Not reported | ALPINE-CVE-2026-56131 | Not reported |
| Alpine | expat | apk | 3.22 | 2.8.2-r0 | Not reported | ALPINE-CVE-2026-56131 | Not reported |
| Alpine | expat | apk | 3.23 | 2.8.2-r0 | Not reported | ALPINE-CVE-2026-56131 | Not reported |
| Alpine | expat | apk | 3.24 | 2.8.2-r0 | Not reported | ALPINE-CVE-2026-56131 | Not reported |
| Ubuntu | expat | deb | pro | 2.2.9-1ubuntu0.8+esm3 | Not reported | USN-8813-1 | Not reported |
| Ubuntu | expat | deb | 22.04 | 2.4.7-1ubuntu0.9 | Not reported | USN-8813-1 | Not reported |
| Ubuntu | expat | deb | 24.04 | 2.6.1-2ubuntu0.6 | Not reported | USN-8813-1 | Not reported |
| Ubuntu | expat | deb | 26.04 | 2.7.4-1ubuntu0.2 | Not reported | USN-8813-1 | Not reported |
OpenFactory catalog packages
Die Paketzuordnung läuft.
[Debian 12 (Bookworm)]
- [expat]Unbekannt
Details (4)
2.5.0-1+deb12u2· amd64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u2· arm64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· amd64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· arm64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
- [libexpat1]Unbekannt
Quellpaket: [expat]
Details (4)
2.5.0-1+deb12u2· amd64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u2· arm64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· amd64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· arm64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
- [libexpat1-dev]Unbekannt
Quellpaket: [expat]
Details (4)
2.5.0-1+deb12u2· amd64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u2· arm64 · bookwormBetroffen · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· amd64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
2.5.0-1+deb12u3· arm64 · bookworm-securityBehoben · Behoben:
2.5.0-1+deb12u3nvd · expat · debian · bookworm; nvd · expat · debian · 12
[Debian 13 (Trixie)]
- [expat]Unbekannt
Details (6)
2.7.1-2· amd64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.7.1-2· arm64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.2-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· arm64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.9.0-1~deb13u1· amd64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
- [libexpat1]Unbekannt
Quellpaket: [expat]
Details (6)
2.7.1-2· amd64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.7.1-2· arm64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.2-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· arm64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.9.0-1~deb13u1· amd64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
- [libexpat1-dev]Unbekannt
Quellpaket: [expat]
Details (6)
2.7.1-2· amd64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.7.1-2· arm64 · trixieBetroffen · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.2-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· amd64 · trixie-security · Historical versionBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.8.3-1~deb13u1· arm64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
2.9.0-1~deb13u1· amd64 · trixie-securityBehoben · Behoben:
2.8.2-1~deb13u1nvd · expat · debian · 13
Beobachtet:
Referenzen
- [https://access.redhat.com/errata/RHSA-2026:40486]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_4619-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56131]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-56131]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56131]
- [https://osv.dev/vulnerability/USN-8813-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-56131]
- [https://ubuntu.com/security/notices/USN-8813-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2008.json]
[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)]