Cyber Resilience

CVE-2025-46688

MediumPublic PoC

Published: 27 April 2025

Published
27 April 2025
Modified
30 May 2025
KEV Added
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Patch
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CVSS Score v3.1 5.6 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
EPSS Score 0.0008 23.0th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-46688 is a medium-severity Incorrect Calculation of Buffer Size (CWE-131) vulnerability in Quickjs-Ng Quickjs. Its CVSS base score is 5.6 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 23.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

quickjs-ng through 0.9.0 has an incorrect size calculation in JS_ReadBigInt for a BigInt, leading to a heap-based buffer overflow. QuickJS before 2025-04-26 is also affected.

CWE(s)
CWE-131

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Why these techniques?

Heap buffer overflow due to integer overflow in QuickJS JavaScript engine (JS_ReadBigInt/js_alloc_string_rt) exploitable via crafted input (e.g., BigInt data), enabling arbitrary code execution in embedding/client applications.

Affected Assets

quickjs-ng
quickjs
≤ 0.9.0
quickjs project
quickjs
≤ 2025-04-26

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References