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CVE-2026-5731VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik Amazon · Mozilla Firefox und Thunderbird: Mehrere Schwachstellen

Affects Bundesamt für Sicherheit in der Informationstechnik AmazonSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-5731· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical · fixed in 149.0.2 : patch Bundesamt für Sicherheit in der Informationstechnik Amazon as a priority.

Data as of 9 Nov 2026, 14:50 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 149.0.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Apr 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 9 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Bundesamt für Sicherheit in der Informationstechnik AmazonAffected
  • =115.34.0
  • =140.9.0
  • =149.0.1
Fixed in–

AI-suggested

Apply the official Mozilla updates to remediate these vulnerabilities. The fixes are included in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2, and Thunderbird 149.0.2. Users and administrators should upgrade to these versions or later to ensure protection against these memory safety and graphics component vulnerabilities.

Description

Multiple memory safety vulnerabilities affecting Mozilla Firefox and Thunderbird, including ESR versions, were identified and fixed in versions Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, Thunderbird ESR 140.9.1. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. Additional issues include integer overflow and boundary condition errors in graphics components fixed in Firefox 149.0.2. The vulnerabilities have been addressed in official Mozilla releases.

References

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