CVE-2025-5268
Description
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Memory safety bugs in Firefox and Thunderbird could lead to memory corruption and arbitrary code execution; fixed in version 139 and ESR 128.11.
Vulnerability
Overview CVE-2025-5268 is a collection of memory safety bugs affecting Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. These bugs showed evidence of memory corruption, and with sufficient effort could be exploited to run arbitrary code [1][2].
Attack
Vector The vulnerabilities are present in browser and browser-like contexts. In Thunderbird, scripting is disabled when reading mail, so these flaws cannot be exploited through email, but they remain a risk in other contexts [1][3].
Impact
Successful exploitation could lead to memory corruption and arbitrary code execution, potentially allowing an attacker to take control of the affected system [1][2].
Mitigation
Mozilla has addressed these issues in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11. Users are advised to update to these versions [1][2][3][4].
AI Insight generated on May 20, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
3cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <139.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <128.11.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- www.mozilla.org/security/advisories/mfsa2025-42/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-44/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-45/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-46/nvdVendor Advisory
- bugzilla.mozilla.org/buglist.cginvdBroken Link
- lists.debian.org/debian-lts-announce/2025/05/msg00043.htmlnvd
- lists.debian.org/debian-lts-announce/2025/05/msg00046.htmlnvd
News mentions
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