Critical severity9.8NVD Advisory· Published Mar 4, 2025· Updated Apr 13, 2026

CVE-2025-1942

Description

When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.

Affected products

Mozilla Corporation/Firefox
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Range: <136.0
Mozilla Corporation/Thunderbird
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Range: <136.0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

www.mozilla.org/security/advisories/mfsa2025-14/nvdVendor Advisory
www.mozilla.org/security/advisories/mfsa2025-17/nvdVendor Advisory
bugzilla.mozilla.org/show_bug.cginvdIssue Tracking

News mentions

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epss	0.000
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kev	0.000
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ransomware	0.000