CVE-2026-74860Public exploitNetwork attack vector

Application crash via SAX attribute double-free

Published Sep 8, 2026 · Updated Sep 9, 2026

Double-free in Red Hat libxml2 Python SAX bindings allows remote attackers to crash applications via crafted XML containing a DTD. In pythonAttributeDecl, PyList_SetItem takes ownership of each enumerated attribute string, but a following Py_DECREF frees it again and leaves dangling list pointers. Reachability requires an application to register the SAX attributeDecl handler and parse untrusted XML; a reproducible SIGSEGV is demonstrated, but remote code execution is not.

CVSS severity8.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in Red Hat libxml2 Python SAX bindings allows remote attackers to crash applications via crafted XML containing a DTD. In pythonAttributeDecl, PyList_SetItem takes ownership of each enumerated attribute string, but a following Py_DECREF frees it again and leaves dangling list pointers. Reachability requires an application to register the SAX attributeDecl handler and parse untrusted XML; a reproducible SIGSEGV is demonstrated, but remote code execution is not.

The record

CVE
CVE-2026-74860
Published
Sep 8, 2026
Updated
Sep 9, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-763, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

8.5Red HatCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-763Release of Invalid Pointer or Reference
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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