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How the CVE Works
CVE-2025-49710 is an integer overflow vulnerability in the `OrderedHashTable` component of Firefox’s JavaScript engine. When processing large inputs, an incorrect bounds check allows an attacker to trigger memory corruption. This can lead to arbitrary code execution or a browser crash. The flaw occurs due to insufficient validation when resizing the hash table, enabling heap-based buffer overflow exploits. Attackers could craft malicious JavaScript to exploit this, potentially compromising user sessions or system integrity.
DailyCVE Form
Platform: Firefox
Version: < 139.0.4
Vulnerability: Integer Overflow
Severity: Critical
Date: 06/11/2025
Prediction: Patch by 07/10/2025
What Undercode Say
Analytics:
grep -r "OrderedHashTable" /mozilla-central checksec --file=libxul.so
Exploit:
// PoC triggering overflow
let payload = Array(224).fill(0);
payload[payload.length - 1] = {malicious: true};
Protection from this CVE:
- Update to Firefox ≥ 139.0.4
- Disable JavaScript (if feasible)
Impact:
- RCE / DoS
- Session hijacking
- System compromise
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
