Red Hat Security Advisory: firefox security update
Affects Red Hat firefoxSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 7.5 High : upgrade Red Hat firefox to 140.8.0 soon.
Data as of 26 Oct 2026, 10:12 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 31% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 140.8.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Red Hat firefox to 140.8.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| Fixed in
|
AI-suggested
An official security update is available from Red Hat for Red Hat Enterprise Linux 9.6 Extended Update Support, including Firefox ESR 140.7 and Thunderbird ESR 140.7 packages that address these vulnerabilities. Users and administrators should apply the update promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the provided patches.
Description
Multiple security vulnerabilities have been identified and fixed in Mozilla Firefox and Thunderbird as part of a Red Hat security advisory for Red Hat Enterprise Linux 9.6 Extended Update Support. The issues include spoofing, use-after-free, memory safety bugs, sandbox escapes, information disclosure, mitigation bypasses, and clickjacking across various Firefox components such as Downloads Panel, JavaScript engine, Graphics, IPC, Networking, DOM, and PDF Viewer. These vulnerabilities affect Firefox ESR 140.7 and Thunderbird ESR 140.7, as well as Firefox 147 and Thunderbird 147. The update addresses these issues to improve security and stability.
References
- access.redhat.com/errata/RHSA-2026:2043 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2420507 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428961 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428963 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428965 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428966 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428967 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428968 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428969 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428971 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428972 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428973 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428975 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2428978 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_2043.json (opens in a new tab)
- suse.com/support/security/rating/ (opens in a new tab)
- ftp.suse.com/pub/projects/security/csaf/rhsa-2026_2043.json (opens in a new tab)
- lists.suse.com/pipermail/suse-liberty-linux-updates/2026-February/002477.html (opens in a new tab)
- suse.com/security/cve/CVE-2025-14327/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0877/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0878/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0879/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0880/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0882/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0883/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0884/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0885/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0886/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0887/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0890/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-0891/ (opens in a new tab)