CVE-2026-100786

Severity: Critical

Published: 2026-09-29

Sandbox escape due to use-after-free in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Exploit evidence

No public exploit evidence reported by NVD

Last checked: 2026-10-05 13:44 UTC

No exploitation evidence · CISA Coordinator (Assessed 2026-09-29 16:28 UTC)

NVD evidence for CVE-2026-100786 is reported, not independently verified by Package Alert. It does not establish exploit reliability or applicability to a particular package or environment.

References

Fix Status by Distribution

Fix evidence last checked: 2026-10-24 20:47 UTC

Fixed in:

AlmaLinux 10
- Repository package · Published 2026-10-07 · Observed 2026-10-24
Debian 12 (Bookworm)
- DLA-4814-1 · Published 2026-10-02
- DLA-4810-1 · Published 2026-10-02
Debian 13 (Trixie)
- DSA-6533-1 · Published 2026-09-30
- DSA-6536-1 · Published 2024-12-01
Oracle Linux 10
- ELSA-2026-80674 · Published 2026-10-11
- ELSA-2026-76764 · Published 2026-10-07
Oracle Linux 8
- ELSA-2026-76850 · Published 2026-10-08
Oracle Linux 9
- ELSA-2026-80694 · Published 2026-10-13
- ELSA-2026-76761 · Published 2026-10-07
Red Hat Enterprise Linux 10
- RHSA-2026:80674 · Published 2026-10-12
- RHSA-2026:76764 · Published 2026-10-06
Red Hat Enterprise Linux 8
- RHSA-2026:76850 · Published 2026-10-06
Red Hat Enterprise Linux 9
- RHSA-2026:80694 · Published 2026-10-12
- RHSA-2026:76761 · Published 2026-10-06
Rocky Linux 10
- RLSA-2026:80674 · Published 2026-10-24
- RLSA-2026:76764 · Published 2026-10-24
Rocky Linux 8
- RLSA-2026:76850 · Published 2026-10-24
Rocky Linux 9
- RLSA-2026:80694 · Published 2026-10-24
- RLSA-2026:76761 · Published 2026-10-24
SUSE Linux Enterprise Server 12 SP5
- SUSE-SU-2026:4543 · Published 2026-10-06
SUSE Linux Enterprise Server 15 SP5
- SUSE-SU-2026:4545 · Published 2026-10-06
SUSE Linux Enterprise Server 15 SP6
- SUSE-SU-2026:4545 · Published 2026-10-06
SUSE Linux Enterprise Server 15 SP7
- SUSE-SU-2026:4627 · Published 2026-10-12
- SUSE-SU-2026:4545 · Published 2026-10-06
SUSE Linux Enterprise Server 16
- SUSE-SU-2026:23981 · Published 2026-09-30

No fix evidence found:

AlmaLinux 8

AlmaLinux 9

Debian 11 (Bullseye)

Red Hat Enterprise Linux 7 (Extended Lifecycle Support)

Ubuntu 22.04 LTS (Jammy Jellyfish)

Ubuntu 24.04 LTS (Noble Numbat)

Ubuntu 25.04 (Plucky Puffin)

Ubuntu 25.10 (Questing Quokka)

Ubuntu 26.04 LTS (Resolute Raccoon)

Ubuntu 26.10 (Stonking Stingray)

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