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 10.2 soon.
Data as of 26 Oct 2026, 09:15 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 10.2
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 10.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| Fixed in
|
AI-suggested
Red Hat has released updated Firefox packages (ESR 140.7 and Firefox 147) that address all listed vulnerabilities. Users of Red Hat Enterprise Linux 10 and its Extended Update Support versions should apply these official security updates promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. No additional mitigation beyond applying the vendor-provided patches is indicated.
Description
Multiple security vulnerabilities affecting Mozilla Firefox have been addressed in a Red Hat security update for Red Hat Enterprise Linux 10 and its Extended Update Support versions. The issues include spoofing, use-after-free, memory safety bugs, sandbox escapes, information disclosure, mitigation bypass, and clickjacking across various Firefox components such as Downloads Panel, JavaScript engine, Graphics, IPC, Networking, DOM, and PDF Viewer. These vulnerabilities have been fixed in Firefox ESR 140.7 and Firefox 147 packages provided by Red Hat.
References
- access.redhat.com/errata/RHSA-2026:2271 (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_2271.json (opens in a new tab)