CVE catalog
CVE-2026-6653
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper ent
- Severity
- High · CVSS 7
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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
- 0.36% · Oct 25, 2026
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.
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 | libxml2 | sid | 2.15.4+dfsg-1 | fixed |
| Debian | libxml2 | forky | 2.15.4+dfsg-1 | fixed |
| Debian | libxml2 | trixie | 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | vulnerable |
| Debian | libxml2 | trixie-security | 2.12.7+dfsg+really2.9.14-2.1+deb13u1 | vulnerable |
| Debian | libxml2 | bookworm | 2.9.14+dfsg-1.3~deb12u6 | vulnerable |
| Debian | libxml2 | bookworm-security | 2.9.14+dfsg-1.3~deb12u4 | vulnerable |
| Cpe | libxml2 | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | libxml2-dev | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | libxml2-doc | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | libxml2-utils | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | python3-libxml2 | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | libxml2 | Not reported | Not reported | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-4 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-5 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-6 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1build1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.2 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.3 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.4 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.5 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.6 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.7 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.8 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.9 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.10 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.11 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.12 | fixed |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.4 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.5 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.6 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.7 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-4 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-5 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.12+dfsg-6 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1build1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.1 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.2 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.3 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.4 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.5 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.6 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.7 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.8 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.9 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.10 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.11 | vulnerable |
| Ubuntu | libxml2 | 22.04 | 2.9.13+dfsg-1ubuntu0.12 | fixed |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3build3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.1 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.2 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.3 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.4 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.5 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.6 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.7 | vulnerable |
| Ubuntu | libxml2 | 24.04 | 2.9.14+dfsg-1.3ubuntu3.8 | fixed |
| Cpe | libxml2 | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libxml2 | source | sid | 2.14.5+dfsg-0.1 | not yet assigned | Not reported | Not reported |
| Debian | libxml2 | source | forky | 2.14.5+dfsg-0.1 | not yet assigned | Not reported | Not reported |
| Debian | libxml2 | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libxml2 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | libxml2 | cpe | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | Not reported | Not reported |
| Cpe | libxml2-dev | cpe | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | Not reported | Not reported |
| Cpe | libxml2-doc | cpe | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | Not reported | Not reported |
| Cpe | libxml2-utils | cpe | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | Not reported | Not reported |
| Cpe | python3-libxml2 | cpe | Not reported | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | Not reported | Not reported |
| Ubuntu | libxml2 | deb | 22.04 | 2.9.13+dfsg-1ubuntu0.12 | Not reported | UBUNTU-CVE-2026-6653 | Not reported |
| Ubuntu | libxml2 | deb | 24.04 | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | UBUNTU-CVE-2026-6653 | Not reported |
| Ubuntu | libxml2 | deb | 22.04 | 2.9.13+dfsg-1ubuntu0.12 | Not reported | USN-8456-1 | Not reported |
| Ubuntu | libxml2 | deb | 24.04 | 2.9.14+dfsg-1.3ubuntu3.8 | Not reported | USN-8456-1 | Not reported |
Notes
[trixie] libxml2: Minor issue [bookworm] libxml2: Minor issue; UAF present via CVE-2021-3541 backport, fix only in 2.11.0
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libxml2]Affected
Details (4)
2.9.14+dfsg-1.3~deb12u6· amd64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u6· arm64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· amd64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· arm64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- [libxml2-dev]Affected
Source package: [libxml2]
Details (4)
2.9.14+dfsg-1.3~deb12u6· amd64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u6· arm64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· amd64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· arm64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- [libxml2-doc]Affected
Source package: [libxml2]
Details (4)
2.9.14+dfsg-1.3~deb12u6· all · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u6· all · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· all · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· all · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- [libxml2-utils]Affected
Source package: [libxml2]
Details (4)
2.9.14+dfsg-1.3~deb12u6· amd64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u6· arm64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· amd64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· arm64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- [python3-libxml2]Affected
Source package: [libxml2]
Details (4)
2.9.14+dfsg-1.3~deb12u6· amd64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u6· arm64 · bookwormAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· amd64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
2.9.14+dfsg-1.3~deb12u4· arm64 · bookworm-securityAffected
nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
[Debian 13 (Trixie)]
- [libxml2]Affected
Details (4)
2.12.7+dfsg+really2.9.14-2.1+deb13u3· amd64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u3· arm64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· amd64 · trixie-securityAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· arm64 · trixie-securityAffected
nvd · libxml2 · debian · 13
- [libxml2-dev]Affected
Source package: [libxml2]
Details (4)
2.12.7+dfsg+really2.9.14-2.1+deb13u3· amd64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u3· arm64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· amd64 · trixie-securityAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· arm64 · trixie-securityAffected
nvd · libxml2 · debian · 13
- [libxml2-doc]Affected
Source package: [libxml2]
Details (4)
2.12.7+dfsg+really2.9.14-2.1+deb13u3· all · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u3· all · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· all · trixie-securityAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· all · trixie-securityAffected
nvd · libxml2 · debian · 13
- [libxml2-utils]Affected
Source package: [libxml2]
Details (4)
2.12.7+dfsg+really2.9.14-2.1+deb13u3· amd64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u3· arm64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· amd64 · trixie-securityAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· arm64 · trixie-securityAffected
nvd · libxml2 · debian · 13
- [python3-libxml2]Affected
Source package: [libxml2]
Details (4)
2.12.7+dfsg+really2.9.14-2.1+deb13u3· amd64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u3· arm64 · trixieAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· amd64 · trixie-securityAffected
nvd · libxml2 · debian · 13
2.12.7+dfsg+really2.9.14-2.1+deb13u1· arm64 · trixie-securityAffected
nvd · libxml2 · debian · 13
Observed:
References
- [https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_61247.json]
- [https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-6653]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-6653]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-6653]
- [https://osv.dev/vulnerability/USN-8456-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-6653]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6653.json]
- [https://ubuntu.com/security/notices/USN-8456-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3038.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)]