Answer in brief
CVE-2026-86716 records a Unknown severity vulnerability in Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow. The current sources do not mark it as known exploited. The current feed maps Cesanta/mJS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Cesanta/mJS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Cesanta/mJSgeneric | 1.0 || 1.1 || 1.2 || 1.3 || 1.4 || 1.5 || 1.6 || 1.7 || 1.8 || 1.9 || 1.10 || 1.11 || 1.12 || 1.13 || 1.14 || 1.15 || 1.16 || 1.17 || 1.18 || 1.19 || 1.20 || 1.21 || 1.22 || 1.23 || 1.24 || 1.25 || 1.26 | Not reported |
Published upstream
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.