Out-of-bounds read in Mongoose - CVE-2026-73260
Published: August 12, 2026
Vulnerability identifier: #VU142182
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73260
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the built-in TLS X.509 DER parser when parsing a crafted X.509 certificate during the TLS handshake. A remote attacker can present a specially crafted certificate to cause a denial of service.
Only applications built with the built-in TLS stack are vulnerable, and exploitation occurs before authentication completes.
Affected software
Mongoose
How to mitigate CVE-2026-73260
Install security update from vendor's website.
Mongoose - update to 7.23