Red Hat Fixes a Second libtiff Flaw on RHEL 8
Tech GuruQuick Answer
RHSA-2026:69292 updates libtiff on the listed RHEL 8.4 AUS and EUS Extension streams to 4.0.9-18.el8_4.3. CVE-2026-12912 concerns a crafted PixarLog-compressed TIFF reaching a particular decoding path, with possible code execution or denial of service.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory RHEL 8.4 AUS and EUS Extension libtiff packages, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-09-21 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | RHEL 8.4 AUS and EUS Extension libtiff packages |
|---|---|
| Advisory | RHSA-2026:69292 |
| CVE | CVE-2026-12912 |
| Authoritative release date | 2026-09-21 12:03:41 UTC |
| Authority revision date | 2026-09-21 12:04:12 UTC |
| Affected versions | The advisory-specific supported RHEL 8.4 AUS and EUS Extension libtiff packages builds before the listed fixed package or release. |
| Fixed version | libtiff 4.0.9-18.el8_4.3 |
| CVSS base score | 7.3 (CVSS v3.1) |
| CVSS severity | High |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
Red Hat identifies a heap buffer overflow when decoding PixarLog images with PIXARLOGDATAFMT_8BITABGR output and a specific stride. That is a distinct input and codec path from the tiffcrop command-option issue in the other libtiff notice. A matching package and reachable decoding path matter more than the shared library name alone.
What To Validate Now
- Inventory. Locate RHEL 8.4 AUS and EUS Extension libtiff packages deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: The advisory-specific supported RHEL 8.4 AUS and EUS Extension libtiff packages builds before the listed fixed package or release. Do not infer applicability from product family or severity alone.
- Remediate. Apply libtiff 4.0.9-18.el8_4.3 through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Verify the RHEL 8.4 package and any rebuilt application images, follow supported activation steps, and test trusted TIFF/PixarLog workflows and error handling used by the application.
- 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
Use the exact supported release stream and repository. Test dependencies, clusters, integrations, and rollback before broad deployment; a CVSS rating or reachable feature is not evidence of exploitation.
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.
