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Description

A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.

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




MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Uncontrolled Recursion

Product status

Default status
affected

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affected

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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 Nick Wellnhofer for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-0990 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2429959 (RHBZ#2429959) issue-tracking

cve.org (CVE-2026-0990)

nvd.nist.gov (CVE-2026-0990)

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