Vulnerability-Lookup

SUSE-SU-2026:20372-1

Vulnerability from csaf_suse - Published: 2026-02-16 08:19 - Updated: 2026-02-16 08:19

Summary

Security update for libxml2

Notes

Title of the patch

Security update for libxml2

Description of the patch

This update for libxml2 fixes the following issues: - CVE-2026-0989: Fixed call stack exhaustion leading to application crash due to RelaxNG parser not limiting the recursion depth when resolving `<include>` directives (bsc#1256805).

Patchnames

SUSE-SLE-Micro-6.1-392

CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).

JSON

To clipboard

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}

CVE-2026-0989 (GCVE-0-2026-0989)

Vulnerability from cvelistv5 – Published: 2026-01-15 14:20 – Updated: 2026-01-15 16:39

Title

Libxml2: unbounded relaxng include recursion leading to stack overflow

Summary

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.

Severity ?

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-674 - Uncontrolled Recursion

Assigner

redhat

References

URL

Tags

	https://access.redhat.com/security/cve/CVE-2026-0989	vdb-entryx_refsource_REDHAT
	https://bugzilla.redhat.com/show_bug.cgi?id=2429933	issue-trackingx_refsource_REDHAT

Impacted products

Vendor

Product

Version

Red Hat

Red Hat Enterprise Linux 10

cpe:/o:redhat:enterprise_linux:10

Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat JBoss Core Services	cpe:/a:redhat:jboss_core_services:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public ?

2026-01-15 00:00

Credits

Red Hat would like to thank lanbigking for reporting this issue.

Show details on NVD website

JSON

To clipboard

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              "description": "Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-15T14:20:23.274Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-0989"
        },
        {
          "name": "RHBZ#2429933",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429933"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-01-15T12:36:12.129Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-01-15T00:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Libxml2: unbounded relaxng include recursion leading to stack overflow",
      "workarounds": [
        {
          "lang": "en",
          "value": "To mitigate this issue, restrict applications using libxml2 from processing untrusted RelaxNG schema files. Implement strict input validation and sanitization for all RelaxNG schema inputs to prevent the parsing of maliciously crafted, deeply nested include directives."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-674: Uncontrolled Recursion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-0989",
    "datePublished": "2026-01-15T14:20:23.274Z",
    "dateReserved": "2026-01-15T12:38:51.419Z",
    "dateUpdated": "2026-01-15T16:39:34.311Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

SUSE-SU-2026:20372-1

CVE-2026-0989 (GCVE-0-2026-0989)

Tags

Sightings

Nomenclature