High [CVE-2026-12296] Sandbox escape in the Security: Process Sandboxing component
This high-severity Red Hat Linux advisory covers CVE-2026-12296 affecting Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux AppStream (v. 10).
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
Sandbox escape in the Security: Process Sandboxing component. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-403. Affected package(s): firefox, thunderbird.
Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux Server (v. 7 ELS); Red Hat Enterprise Linux AppStream EUS (v. 10.0); Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream (v. 8); and 22 more.
- firefox-0:140.12.0-1.el9_8
- firefox-0:140.12.0-1.el8_10
- thunderbird-0:140.12.0-1.el8_10
- firefox-0:140.12.0-1.el10_2
- thunderbird-0:140.12.0-1.el10_2
- thunderbird-0:140.12.0-1.el9_8
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:29940
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:29940 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.