Red Hat Fixes libxml2 Vulnerabilities on RHEL 7 ELS
Tech GuruQuick Answer
Six libxml2 fixes address memory corruption, Python binding lifetime handling, write callbacks and parser-flag propagation. Confirm the exact supported stream and installed build, apply the corresponding erratum, validate operations, and retain evidence.
Confirm Scope And Apply The Supported Remediation
What to do now: Record libxml2 and Python bindings, XML consumers, parsing options and RHEL 7 ELS entitlement. Match the documented versions, enabled features and attack prerequisites to the deployment before assigning applicability. Install the applicable signed update from the entitled Red Hat repository, preserving the package epoch, architecture and support stream. Restart dependent processes after installing the entitled fixed package. Verify XML parsing, schema validation, integrations and active library versions; retain installed and active versions, test results and change records.
Last verified: 2026-11-02 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | libxml2 on RHEL 7 ELS |
|---|---|
| Advisory | RHSA-2026:93791 |
| CVEs | CVE-2026-74860, CVE-2026-86138, CVE-2026-86140, CVE-2026-86142, CVE-2026-86143, CVE-2026-86144 |
| Authoritative release date | 2026-11-02T13:36:29Z |
| Authority revision date | 2026-11-02T13:37:44Z (latest authority revision) |
| Affected versions | Advisory-listed packages or images before the applicable fixed build on Red Hat Enterprise Linux Server (v. 7 ELS); Red Hat Enterprise Linux Server Optional (v. 7 ELS). |
| Fixed version | libxml2-0:2.9.1-6.el7_9.20.src |
| CVSS base score | 5.6-8.5 (CVSS v3.1; CVE-specific) |
| CVSS severity | Medium to High |
| Exploitation status | The cited authority does not state that this issue is being maliciously exploited.; no exploitation claim is inferred. |
Authority-Specific Scope And Version Evidence
| RHSA-2026:93791 | Released 2026-11-02T13:36:29Z; revised 2026-11-02T13:37:44Z. Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS). Fixed source-package families: libxml2-0:2.9.1-6.el7_9.20.src. CVSS 5.6-8.5 (CVSS v3.1; CVE-specific); Medium to High. Vendor rating: Important. |
|---|
What Changed
Six libxml2 fixes address memory corruption, Python binding lifetime handling, write callbacks and parser-flag propagation.
What To Validate Now
- Inventory. Record libxml2 and Python bindings, XML consumers, parsing options and RHEL 7 ELS entitlement.
- Establish applicability. Match the documented versions, enabled features and attack prerequisites to the deployment before assigning applicability.
- Remediate. Install the applicable signed update from the entitled Red Hat repository, preserving the package epoch, architecture and support stream. Restart dependent processes after installing the entitled fixed package.
- Validate. Verify XML parsing, schema validation, integrations and active library versions; retain installed and active versions, test results and change records.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Do not replace an ELS package with an incompatible upstream library. Validate private copies and parser network access separately. CVSS values are per-CVE authority scores, not one score assigned to the entire update.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
