CVE-2025-49710

CRITICALNVD 9.89.8—

9.8

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

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 61.7%
KEV: Not listed

Published

June 11, 2025

Last Modified

April 13, 2026

Advisory Details (2)

Auto-updated May 20, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Firefox 139.0.4 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-47/

generic

1970095 - (CVE-2025-49710) SEGV WRITE in __memcpy_avx_unaligned_erms via OrderedHashTableImpl::rehash

https://bugzilla.mozilla.org/show_bug.cgi?id=1970095

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-190Integer Overflow or Wraparound

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-06 13:47 UTCepss_batch
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Frequently asked(5)

What is CVE-2025-49710?

CVE-2025-49710 is a critical vulnerability published on June 11, 2025. An integer overflow was present in OrderedHashTable used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

When was CVE-2025-49710 disclosed?

CVE-2025-49710 was first published in the National Vulnerability Database on June 11, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-49710 actively exploited?

CVE-2025-49710 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-49710?

CVE-2025-49710 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-49710?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-49710, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-49710

📅 Published

🔄 Last Modified

📋 Advisory Details (2)