CVE-2026-8946
high
CVSS v3
7.5
CVSS v4 NEW
—
VIR risk
7.5
Description
Important: thunderbird security update
Predictions
Exploit likelihood
83%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| debian | sid | fixed | 151.0-1 |
| debian | bookworm | fixed | 140.11.0esr-1~deb12u1 |
| debian | bullseye | fixed | 140.11.0esr-1~deb11u1 |
| debian | forky | fixed | 140.11.0esr-1 |
| debian | trixie | fixed | 140.11.0esr-1~deb13u1 |
| sles | affected | | |
| almalinux | 9 | fixed | firefox-x11-140.11.0-1.el9_8.alma.1.ppc64le.rpm |
| almalinux | 8 | fixed | firefox-140.11.0-1.el8_10.alma.1.aarch64.rpm |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| mozilla | firefox | {"endExcluding":"115.36.0"} | 115.36.0 |
| mozilla | thunderbird | {"endExcluding":"140.11"} | 140.11 |
References
- https://access.redhat.com/errata/RHSA-2026:21381
- https://bugzilla.mozilla.org/show_bug.cgi?id=2029070
- https://www.mozilla.org/security/advisories/mfsa2026-46/
- https://www.mozilla.org/security/advisories/mfsa2026-47/
- https://www.mozilla.org/security/advisories/mfsa2026-48/
- https://www.mozilla.org/security/advisories/mfsa2026-50/
- https://www.mozilla.org/security/advisories/mfsa2026-51/
- https://security-tracker.debian.org/tracker/CVE-2026-8946
- https://www.suse.com/security/cve/CVE-2026-8946.html
- https://access.redhat.com/errata/RHSA-2026:21378
- https://access.redhat.com/errata/RHSA-2026:21382
- https://bugzilla.redhat.com/2476469
- https://bugzilla.redhat.com/2476475
- https://bugzilla.redhat.com/2476492
- https://bugzilla.redhat.com/2479839
- https://bugzilla.redhat.com/2479840
- https://bugzilla.redhat.com/2479842
- https://bugzilla.redhat.com/2479846
- https://bugzilla.redhat.com/2479847
- https://bugzilla.redhat.com/2479848
- https://bugzilla.redhat.com/2479849
- https://bugzilla.redhat.com/2479852
- https://bugzilla.redhat.com/2479853
- https://bugzilla.redhat.com/2479855
- https://bugzilla.redhat.com/2479860
CWEs
CWE-119
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.