Double-Free Vulnerability in libxml2 Affects Python Bindings
CVE-2026-74860

8.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
8 September 2026

What is CVE-2026-74860?

A flaw exists in libxml2 when the Python bindings are enabled. It allows a remote attacker to exploit the vulnerability by sending a specially crafted XML document that includes a Document Type Definition (DTD) with enumerated attribute values. This can trigger a double-free error in the SAX attributeDecl callback handler, which results in a string being freed twice. The consequence of this defect could lead to a denial of service (DoS) due to a crash in Python applications utilizing the libxml2 SAX bindings.

References

https://access.redhat.com/security/cve/CVE-2026-74860
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529697
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.