CVE-2025-46687

quickjs-ng through 0.9.0 has a missing length check in JS_ReadString for a string, leading to a...

5.6 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: Low

Exploit likelihood

0.30%Up 0.3 points since Apr 28, 2025

What each source reports

CVE List Score used 5.6

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.

Record: CVE-2025-46687
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness: CWE-770
Updated: 2026-11-02

EUVDEUVD-2025-12428 5.6

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.

Record: EUVD-2025-12428
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-hrc5-3jpv-g9x2 5.6

quickjs-ng through 0.9.0 has a missing length check in JS_ReadString for a string, leading to a...

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.

Record: GHSA-hrc5-3jpv-g9x2
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness: CWE-770
Updated: 2026-11-02

NVD 5.6

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.

Record: CVE-2025-46687
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-770
Updated: 2026-11-02

OSVALPINE-CVE-2025-46687 7.8

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.

Record: ALPINE-CVE-2025-46687
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSV 5.6

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.

Record: CVE-2025-46687
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
Weakness: CWE-770
Updated: 2026-11-02

OSVDEBIAN-CVE-2025-46687 7.8

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.

Record: DEBIAN-CVE-2025-46687
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2025-46687 5.6

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.

Record: UBUNTU-CVE-2025-46687
CVSS 3.1: 5.6 MediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`quickjs-ng` Alpine:v3.23	before 0.10.0-r0	0.10.0-r0
`quickjs-ng` Alpine:v3.24	before 0.10.0-r0	0.10.0-r0
`quickjs` Debian:13	before 2025.04.26-1	2025.04.26-1
`quickjs` Debian:14	before 2025.04.26-1	2025.04.26-1
`quickjs` Ubuntu:Pro:24.04:LTS	All versions, plus listed versions 2021.03.27-12021.03.27-1ubuntu0.1~esm1	None known
`quickjs` Ubuntu:25.10	All versions, plus listed versions 2024.01.13-52025.04.26-1	None known
`quickjs` Ubuntu:26.10	All versions, plus listed versions 2025.04.26-1build1	None known
`quickjs` Ubuntu:26.04:LTS	All versions, plus listed versions 2025.04.26-12025.04.26-1build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-46687 is a medium vulnerability (CVSS 5.6) in Bellard Quickjs, published April 27, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 23rd percentile. Fixed in quickjs-ng 0.10.0-r0.

References

Show 7 moreShow less