CVE-2026-100831

Severity: Important

Published: 2026-09-29

Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

Exploit evidence

No public exploit evidence reported by NVD

Last checked: 2026-09-30 19:21 UTC

No exploitation evidence · CISA Coordinator (Assessed 2026-09-29 13:12 UTC)

NVD evidence for CVE-2026-100831 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: 2026-10-02 09:22 UTC

Fixed in:

Debian 12 (Bookworm)
- DLA-4814-1 · Published 2026-10-02
Debian 13 (Trixie)
- DSA-6533-1 · Published 2026-09-30

No fix evidence found:

AlmaLinux 10

AlmaLinux 8

AlmaLinux 9

Debian 11 (Bullseye)

Oracle Linux 10

Oracle Linux 8

Oracle Linux 9

Red Hat Enterprise Linux 10

Red Hat Enterprise Linux 7 (Extended Lifecycle Support)

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

Rocky Linux 10

Rocky Linux 8

Rocky Linux 9

SUSE Linux Enterprise Server 12 SP5

SUSE Linux Enterprise Server 15 SP5

SUSE Linux Enterprise Server 15 SP6

SUSE Linux Enterprise Server 15 SP7

SUSE Linux Enterprise Server 16

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)

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