CVE-2026-74860: Release of Invalid Pointer or Reference in Red Hat Red Hat Enterprise Linux 10
Description
CVE-2026-74860 is a vulnerability in libxml2 with Python bindings enabled on Red Hat Enterprise Linux 10. It involves a double-free error triggered by a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This flaw can cause a denial of service (DoS) due to a crash in Python applications using libxml2 SAX bindings. A security update addressing this issue is available from Red Hat.
CVSS v3.1
Score 8.5high
Affected software
Red Hat
Red Hat Enterprise Linux 10
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
Red Hat
Cert Manager support for Red Hat OpenShift release 1.20
Red Hat
Cert Manager support for Red Hat OpenShift release 1.20
Red Hat
Cert Manager support for Red Hat OpenShift release 1.20
Red Hat
Red Hat Cost Management On-Premise 1
Red Hat
Red Hat Hardened Images
Red Hat
Red Hat Update Infrastructure 5
Red Hat
Red Hat Update Infrastructure 5
Red Hat
Red Hat Update Infrastructure 5
Red Hat
Red Hat Update Infrastructure 5
Red Hat
Red Hat Enterprise Linux 10
Red Hat
Red Hat Enterprise Linux 6
Red Hat
Red Hat Enterprise Linux 7
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
Red Hat
Red Hat Hardened Images
Red Hat
Red Hat OpenShift Container Platform 4
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-74860 affects libxml2 with Python bindings enabled. A remote attacker can exploit this by providing a crafted XML document with a DTD containing enumerated attribute values, causing a double-free error in the SAX attributeDecl callback handler. This leads to a denial of service through a reproducible crash in Python applications using libxml2 SAX bindings. Red Hat has released updated libxml2 packages (version 2.15.4-0.1.hum1) for Red Hat Hardened Images to address this issue.
Potential Impact
Successful exploitation results in a denial of service (DoS) condition due to a crash in Python applications using libxml2 SAX bindings. The CVSS v3.1 score is 8.5 (high severity), indicating high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Red Hat has issued an official security advisory (RHSA-2026:64463) and released updated libxml2 packages (version 2.15.4-0.1.hum1) that fix this vulnerability. Users should apply the provided updates to affected packages as soon as possible. No other mitigation or workaround is specified by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-08-17T09:57:05.862Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-74860","vendor":"Red Hat"}]
Threat ID: 6a9ff394acd9273b49949e2c
Added to database: 09/08/2026, 11:37:56 UTC
Last enriched: 10/16/2026, 21:55:24 UTC
Last updated: 10/23/2026, 15:12:04 UTC
Views: 121
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.