Integer Overflow Vulnerability in QuickJS Regular Expression Engine
CVE-2025-62495

7.1HIGH

Key Information:

Vendor

Quickjs

Status
Quickjs
Vendor
CVE Published:
16 October 2025

What is CVE-2025-62495?

An integer overflow vulnerability exists in the QuickJS regular expression engine's handling of bytecode buffer sizes. When a large or complex regular expression exceeds the positive limits of a signed 32-bit integer, it can cause a wrap-around, resulting in a negative value that is used in offset calculations. This miscalculation allows for out-of-bounds writes, potentially leading to memory corruption or execution of arbitrary code.

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Affected Version(s)

QuickJS 2025-04-26 < 2025-09-13

References

https://bellard.org/quickjs/Changelog
https://issuetracker.google.com/434196926

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
Low
Attack Vector:
Adjacent Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Google Big Sleep
JSON
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