Skip to main content
VulnerabilityPublished Updated

CVE-2025-5268: Memory Safety Bugs Present

Source GCVE Database

0
Compare
Authoritative record:CVE-2025-5268· High 8.1

Not known to be exploited · CVSS 8.1 High · fixed in 139 : patch affected systems soon.

Data as of 30 Oct 2026, 01:42 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 139, 128.11
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 2025

  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 29 Oct 2026.

What to do

AI-suggested

These vulnerabilities have been fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11. Users and administrators should update to these versions or later to mitigate the risk. No additional mitigation steps are required beyond applying the official updates.

Description

Memory safety bugs were identified in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The vulnerabilities have been fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11. The CVSS score for this issue is 6.5, indicating a medium severity level.

References

Community reviews

Loading reviews…