Red Hat Security Advisory: firefox security update
Affects Red Hat firefoxSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 6.5 Medium.
Data as of 5 Nov 2026, 18:48 UTC
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LExploitation evidence
Disclosed: evidence found.
CVE published 1 Apr 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 5 Nov 2026.
What to do
AI-suggested
Red Hat has released updated Firefox packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support that address these vulnerabilities. Users should apply the provided security update (firefox-128.9.0-2.el7_9) to remediate these issues. Detailed update instructions are available in the Red Hat advisory article. No additional mitigation steps are indicated by the vendor.
Description
Multiple security vulnerabilities affecting Mozilla Firefox and Thunderbird have been addressed in a Red Hat security update for Red Hat Enterprise Linux 7 Extended Lifecycle Support. The issues include a URL bar spoofing vulnerability via non-BMP Unicode characters (CVE-2025-3029), a use-after-free triggered by the XSLTProcessor (CVE-2025-3028), and various memory safety bugs (CVE-2025-3030). These vulnerabilities are fixed in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9.
References
- access.redhat.com/errata/RHSA-2025:3628 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2356556 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2356562 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2356563 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_3628.json (opens in a new tab)