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CVE-2026-45186VulnerabilityPublished

Red Hat Security Advisory: thunderbird security, bug fix, and enhancement update

Affects Red Hat thunderbird security,Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-45186· Low 2.9

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

CVSS 3.1 base score
2.9Low
How severe the flaw is on the 0–10 CVSS scale.

Contested

Scorers differ by 2 or more points
CVSS scores by source
CNA (mitre)CVSS 3.12.9
ADP (redhat-SADP)CVSS 3.17.5
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:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
libexpat projectlibexpatAffected
  • <2.8.1
Fixed in
  • 2.8.1
GitHublibexpat/libexpatpkg:github/libexpat/libexpatOther threatsAffected
  • <2.8.1
Fixed in
  • 2.8.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released an update for Mozilla Thunderbird and Firefox components as part of Red Hat Enterprise Linux 10.0 Extended Update Support that addresses all listed vulnerabilities. Users should apply this update promptly to remediate the security issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations or workarounds are indicated in the advisory.

Description

This Red Hat Security Advisory addresses multiple security vulnerabilities in Mozilla Thunderbird and Firefox components, including denial of service, privilege escalation, information disclosure, use-after-free, sandbox escapes, mitigation bypasses, and spoofing issues. The update includes fixes for a wide range of flaws affecting various components such as XML parsing, application update, JavaScript engine, networking, graphics, and security sandboxing. The advisory is rated as Important by Red Hat Product Security and applies to Red Hat Enterprise Linux 10.0 Extended Update Support and related architectures.

References

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