CVE-2026-86716Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow
Updated under an hour ago ()
Does this affect you?
It affects Cesanta mJS. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
- Weakness (CWE)
- CWE-122, CWE-119
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Sep 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cesanta mJS cesanta:mjs | 1.0; 1.1; 1.2; 1.3; 1.4; 1.5; 1.6; 1.7; and 19 more ranges | CNA record |
References
- https://vuldb.com/vuln/399773vdb-entry, technical-description
- https://vuldb.com/vuln/399773/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-86716third-party-advisory
- https://vuldb.com/submit/910881third-party-advisory
- https://vuldb.com/submit/910882third-party-advisory
- https://github.com/cesanta/mjs/issues/324exploit, issue-tracking
- https://github.com/cesanta/mjs/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.