CVE-2026-86716 Cesanta mJS - Buffer Overflow

Cesanta mJS <= 1.26 contains a heap-based buffer overflow caused by improper handling in skip_spaces_and_comments function in src/mjs_tok.c, letting remote attackers cause memory corruption, exploit requires crafted input.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-119

Vendor fix

Update to the latest version beyond 1.26.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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