Description
A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat JBoss Core Services | — | — |
| Red Hat | Red Hat OpenShift AI (RHOAI) | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libxml2 | 2.15.2+dfsg-0.1 | — |
| Debian 13 | libxml2 | 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | — |
| Debian 12 | libxml2 | 2.9.14+dfsg-1.3~deb12u6 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | libxml2 | 2.14.5+dfsg-0.2ubuntu0.1 | — |
| Ubuntu 24.04 LTS | libxml2 | 2.9.14+dfsg-1.3ubuntu3.7 | — |
| Ubuntu 22.04 LTS | libxml2 | 2.9.13+dfsg-1ubuntu0.11 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libxml2 | 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | — |
| Ubuntu Pro 18.04 LTS | libxml2 | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | — |
| Ubuntu Pro 16.04 LTS | libxml2 | 2.9.3+dfsg1-1ubuntu0.7+esm12 | — |
| Ubuntu Pro 14.04 LTS | libxml2 | 2.9.1+dfsg1-3ubuntu4.13+esm11 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libxml2 +4 | 2.15.2-0.3.hum1 | RHSA-2026:7519 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libxml2 +1 | 2.12.10-150700.4.11.1 | SUSE-SU-2026:0605-1 |
| SLES 12 SP5 | libxml2 +1 | 2.9.4-46.96.1 | SUSE-SU-2026:0336-1 |
| SLES 3 | libxml2-python | 2.12.10-150700.4.11.1 | SUSE-SU-2026:0605-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libxml2 +1 | 2.13.8-160000.3.1 | SUSE-SU-2026:20233-1 |
| SLES 16.0 | libxml2 +1 | 2.13.8-160000.3.1 | SUSE-SU-2026:20233-1 |
| SLE Micro 6.2 | libxml2 +1 | 2.13.8-160000.3.1 | SUSE-SU-2026:20234-1 |
| SLE Micro 6.1 | libxml2 | 2.11.6-slfo.1.1_7.1 | SUSE-SU-2026:20657-1, SUSE-SU-2026:20372-1 |
| SLE Micro 6.1 | libxml2-python | 2.11.6-slfo.1.1_8.1 | SUSE-SU-2026:20657-1 |
| SLE Micro 6.1 | libxslt | 1.1.38-slfo.1.1_6.1 | SUSE-SU-2026:20657-1 |
| SLE Micro 6.0 | libxml2 | 2.11.6-11.1 | SUSE-SU-2026:20707-1, SUSE-SU-2026:20353-1 |
| SLE Micro 6.0 | libxml2-python | 2.11.6-12.1 | SUSE-SU-2026:20707-1 |
| SLE Micro 6.0 | libxslt | 1.1.38-8.1 | SUSE-SU-2026:20707-1 |
| SLE Micro 5.5 | libxml2 +1 | 2.10.3-150500.5.35.1 | SUSE-SU-2026:0391-1 |
| SLE Micro 5.4 | libxml2 +1 | 2.9.14-150400.5.55.1 | SUSE-SU-2026:0606-1 |
| SLE Micro 5.3 | libxml2 +1 | 2.9.14-150400.5.55.1 | SUSE-SU-2026:0606-1 |
| SLE Micro 5.2 | libxml2 +1 | 2.9.7-150000.3.91.1 | SUSE-SU-2026:0334-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libxml2 | 2.14.5-2.1 | openSUSE-SU-2026:10085-1 |
| openSUSE Leap 16.0 | libxml2 +1 | 2.13.8-160000.3.1 | openSUSE-SU-2026:20178-1 |
| openSUSE Leap 15.6 | libxml2 +1 | 2.10.3-150500.5.35.1 | SUSE-SU-2026:0391-1 |
| openSUSE Leap 15.6 | python-libxml2-python | 2.9.7-150000.3.91.1 | SUSE-SU-2026:0334-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libxml2 +3 | 2.10.4-1.amzn2023.0.17 | ALAS2023-2026-1397 |
| Amazon Linux 2 | libxml2 +3 | 2.9.1-6.amzn2.5.23 | ALAS2-2026-3145 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libxml2 | 2.11.5-10 | — |
| Azure Linux 2 (CBL-Mariner) | libxml2 | No fix yet | — |
Advisories 17
- RHSA-2026:7519 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0126 libxml2: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 31, 2026
- openSUSE-SU-2026:20178-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10085-1 libxml2-16-2.14.5-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20353-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20707-1 Security update for libxslt, libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20657-1 Security update for libxslt, libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20372-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20234-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20233-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0605-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0606-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0336-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0334-1 Security update for libxml2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0391-1 Security update for libxml2 SUSE / openSUSE Security Updates · Feb 7, 2026
- ALAS2-2026-3145 Low: libxml2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 5, 2026
- ALAS2023-2026-1397 Low: libxml2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 5, 2026
References
- RHSA-2026:7519 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-0989 vdb-entry
- RHBZ#2429933 issue-tracking
- https://gitlab.gnome.org/GNOME/libxml2/-/issues/998