What’s Vulnerable › Vulnerabilities

CVE-2025-46687

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-27 · updated 2026-06-17
• Weakness: CWE-770

Description

quickjs-ng through 0.9.0 has a missing length check in JS_ReadString for a string, leading to a heap-based buffer overflow. QuickJS before 2025-04-26 is also affected.

Affected products

• QuickJS: before 2025-04-26 — fixed in 2025-04-26
• quickjs-ng quickjs: through 0.9.0

How to fix

Upgrade to a fixed version: QuickJS 2025-04-26. Check the vendor advisory for mitigations.

References

• https://bellard.org/quickjs/Changelog
• https://github.com/bellard/quickjs/commit/1eb05e44fad89daafa8ee3eb74b8520b4a37ec9a
• https://github.com/bellard/quickjs/issues/399
• https://github.com/quickjs-ng/quickjs/commit/28fa43d3ddff2c1ba91b6e3a788b2d7ba82d1465
• https://github.com/quickjs-ng/quickjs/issues/1018
• https://github.com/quickjs-ng/quickjs/pull/1020

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