Red Hat Security Advisory: firefox security update
Affects Red Hat firefoxSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 6.5 Medium · fixed in Red Hat package updates : update Red Hat firefox when convenient.
Data as of 5 Nov 2026, 19:02 UTC
- Patch
- Available – fixed in 128.9.0
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 containing fixes for these vulnerabilities. Users of Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions should apply the Firefox update to version 128.9.0-2.el9_0 or later as provided by Red Hat. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation is required beyond applying the official update.
Description
Red Hat has issued a security advisory for Firefox addressing multiple vulnerabilities including a URL bar spoofing issue via non-BMP Unicode characters (CVE-2025-3029), a use-after-free vulnerability triggered by XSLTProcessor (CVE-2025-3028), and other memory safety bugs (CVE-2025-3030). These issues affect Firefox and Thunderbird and have been fixed in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. The update is rated as important by Red Hat and is available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions on multiple architectures.
References
- access.redhat.com/errata/RHSA-2025:3587 (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_3587.json (opens in a new tab)