What’s Vulnerable › Vulnerabilities

CVE-2025-49710: Integer overflow in OrderedHashTable

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-11 · updated 2026-10-23
• Weakness: CWE-190

Description

An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

Affected products

• Mozilla Firefox: before 139.0.4 — fixed in 139.0.4

How to fix

Upgrade to a fixed version: Mozilla Firefox 139.0.4. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1970095
• https://www.mozilla.org/security/advisories/mfsa2025-47/

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