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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.

PUBLISHED Reserved 2026-01-15 | Published 2026-01-15 | Updated 2026-01-15 | Assigner redhat




LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem types

Uncontrolled Recursion

Product status

Default status
affected

Default status
affected

Default status
affected

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affected

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affected

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affected

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affected

Timeline

2026-01-15:Reported to Red Hat.
2026-01-15:Made public.

Credits

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

References

access.redhat.com/security/cve/CVE-2026-0989 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2429933 (RHBZ#2429933) issue-tracking

cve.org (CVE-2026-0989)

nvd.nist.gov (CVE-2026-0989)

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