Is CVE-2026-74860 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74860 being exploited in the wild.

How severe is CVE-2026-74860?

High severity, with a CVSS score of 8.5, published 8 September 2026.

Is there a fix for CVE-2026-74860?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-74860 attacked?

It is attacked over the network.

Am I affected by CVE-2026-74860?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74860: libxml2 double-free in SAX DTD attribute parsing

CVE-2026-74860 · Severity: high · CVSS 8.5 · Published 2026-09-08

libxml2 is a widely-used library for parsing and manipulating XML documents, with Python bindings in many applications. A flaw in the SAX parser allows an attacker to send a specially crafted XML file with malicious DTD definitions, causing the library to crash when processing it. This can disrupt services that rely on libxml2 to process XML data, resulting in denial of service.

Quick answers

Is CVE-2026-74860 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74860 being exploited in the wild.
How severe is CVE-2026-74860?: High severity, with a CVSS score of 8.5, published 8 September 2026.
Which products and versions are affected?: libxml2 Project libxml2 <UNKNOWN>.
Is there a fix for CVE-2026-74860?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-74860 attacked?: It is attacked over the network.
Am I affected by CVE-2026-74860?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A double-free vulnerability exists in the SAX attributeDecl callback handler in libxml2 when Python bindings are enabled. An attacker can craft an XML document containing a DTD with enumerated attribute values that triggers the vulnerable code path. The memory corruption leads to a reproducible crash in Python applications using libxml2 SAX bindings. The vulnerability is remotely exploitable via network delivery of a malicious XML document and requires no authentication or special privileges. An attacker can achieve denial of service by crashing Python processes that parse untrusted XML input.

Affected products

libxml2 Project libxml2 <UNKNOWN>

Timeline

2026-09-08: disclosed

References

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