Red Hat Firefox 140.15 Updates Address Ten Vulnerabilities
Tech GuruQuick Answer
Red Hat published RHSA-2026:76894 and RHSA-2026:76895 for Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels. Inventory the exact affected scope, apply firefox 140.15.0-1.el8_4 or 140.15.0-1.el9_6 for the matching entitled channel, validate dependent operations, and preserve change evidence.
Validate Firefox Scope And Apply The Supported Fix
What to do now: Inventory Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels, match versions and enabled features to the authority's scope, apply supported remediation, validate representative operations, and document exceptions.
Last verified: 2026-10-07 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels |
|---|---|
| Advisory | RHSA-2026:76894 / RHSA-2026:76895 |
| CVEs | CVE-2026-16365, CVE-2026-75874, CVE-2026-84119, CVE-2026-84120, CVE-2026-84121, CVE-2026-84122, CVE-2026-84124, CVE-2026-84131, CVE-2026-84143, CVE-2026-84145 |
| Authoritative release date | 2026-10-06 18:05:42 UTC |
| Authority revision date | 2026-10-07 04:06:40 UTC |
| Affected versions | The exact supported Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels builds marked affected by the advisory product-status relationships. |
| Fixed version | firefox 140.15.0-1.el8_4 or 140.15.0-1.el9_6 for the matching entitled channel |
| CVSS base score | 6.1 / 7.5 (CVSS v3.1) |
| CVSS severity | Medium to High |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
Red Hat published an authority-rated Important Firefox security update with branch-specific fixed content for the listed CVEs.
What To Validate Now
- Inventory. Locate Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels; record versions, enabled features, exposure paths, owners, dependencies, support channels, and maintenance groups.
- Establish applicability. Compare every deployment with the authority's affected statement: The exact supported Firefox ESR packages on the advisory-listed RHEL 8.4 and RHEL 9.6 extended-support channels builds marked affected by the advisory product-status relationships. Do not infer applicability from product family, CVSS, or Internet reachability alone.
- Remediate. Apply firefox 140.15.0-1.el8_4 or 140.15.0-1.el9_6 for the matching entitled channel through the authority-supported channel and follow the current advisory.
- Validate. Confirm the resulting Firefox build or managed state, exercise representative services and recovery paths, monitor for regressions, and retain the result.
- 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
Follow the entitled Red Hat update channel and verify package or image relationships for the exact product branch. Preserve pre-change state, installation output, logs, validation evidence, and rollback decisions.
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.
