CVE-2025-1938: Memory Safety Bugs Present
Source GCVE Database
Not known to be exploited · CVSS 6.5 Medium · fixed in 136 : update affected systems when convenient.
Data as of 30 Oct 2026, 01:15 UTC
- Patch
- Available – fixed in 136, 128.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 4 Mar 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 29 Oct 2026.
What to do
AI-suggested
Users and administrators should update affected products to Firefox 136, Thunderbird 136, Firefox ESR 128.8, or Thunderbird 128.8 or later, where these memory safety bugs have been fixed. Applying these official fixes fully mitigates the vulnerabilities. No additional mitigation steps are required beyond updating to the fixed versions.
Description
Memory safety vulnerabilities were identified in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. These bugs showed evidence of memory corruption and could potentially be exploited to execute arbitrary code. The issues were addressed and fixed in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8.
References
- nvd.nist.gov/vuln/detail/CVE-2025-1938 (opens in a new tab)
- bugzilla.mozilla.org/buglist.cgi?bug_id=1922889%2C1935004%2C1943586%2C1943912%2C1948111 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/03/msg00006.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-14 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-16 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-17 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-18 (opens in a new tab)