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CVE-2026-86716— Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow

Quick assessment

Affected
Cesanta mJS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Cesanta mJS 1.26 及更早版本中发现了漏洞。受影响的是 文件中的 函数。通过特定的输入操作可触发堆缓冲区溢出。该漏洞可被远程利用。该漏洞的利用方式已公开披露，可能存在被利用的风险。项目方虽已通过问题报告被提前知会此问题，但尚未作出回应。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 27

VendorProduct Version RangeStatus
Cesanta mJS 1.0 affected
1.1 affected
1.2 affected
1.3 affected
1.4 affected
1.5 affected
1.6 affected
1.7 affected
… +19 more rows
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I. Basic Information for CVE-2026-86716

Vulnerability Information
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Vulnerability Title
Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skip_spaces_and_comments of the file src/mjs_tok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cesanta mJS 1.0 cpe:2.3:a:cesanta:mjs:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86716

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III. Intelligence Information for CVE-2026-86716

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Proof of Concept for CVE-2026-86716 (1)

Other References for CVE-2026-86716 (1)

IV. Related Vulnerabilities

Same vendor: Cesanta
Same weakness: CWE-122

V. Comments for CVE-2026-86716

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