Red Hat Security Advisory: firefox security, bug fix, and enhancement update
Affects Red Hat firefox security,Source GCVE Database
Not known to be exploited · CVSS 2.9 Low : upgrade Red Hat libexpat to 2.8.1 when convenient.
Data as of 11 Nov 2026, 20:51 UTC
Contested
Scorers differ by 2 or more points| CNA (mitre) | CVSS 3.1 | 2.9 |
|---|---|---|
| ADP (redhat-SADP) | CVSS 3.1 | 7.5 |
- Patch
- Available – fixed in 2.8.1
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LExploitation evidence
Disclosed: evidence found.
CVE published 10 May 2026
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 11 Nov 2026.
What to do
Upgrade libexpat and libexpat/libexpat to 2.8.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| libexpat projectlibexpat | Affected
| Fixed in
|
GitHublibexpat/libexpatpkg:github/libexpat/libexpatOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A security update for Mozilla Firefox is available for Red Hat Enterprise Linux 8.6, which addresses all listed vulnerabilities. Users should apply this update promptly to remediate the security issues. For detailed instructions on applying the update, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official update.
Description
This Red Hat Security Advisory addresses multiple security vulnerabilities in Mozilla Firefox and related components, including denial of service, mitigation bypasses, spoofing, privilege escalation, use-after-free, information disclosure, sandbox escapes, race conditions, integer overflows, and incorrect boundary conditions. The advisory covers a broad range of CVEs affecting various Firefox components such as the JavaScript engine, DOM, networking, graphics, storage, and security sandboxing. The update also includes bug fixes and enhancements, including a Firefox ESR 153 rebase. The advisory is rated as having an important security impact.
References
- access.redhat.com/errata/RHSA-2026:99013 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2468575 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550393 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550394 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550396 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550397 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550400 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550401 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550403 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550404 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550405 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550406 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550408 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550410 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550411 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550412 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550413 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550417 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2550418 (opens in a new tab)