Out-of-bounds read in Mongoose - CVE-2026-73252
Published: August 12, 2026
Vulnerability identifier: #VU142181
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-2026-73252
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 mg_tls_recv_record() and mg_tls_drop_message() when processing a crafted TLS 1.3 record in the built-in TLS stack. A remote attacker can send a specially crafted encrypted record with a 16-byte decrypted size to cause a denial of service.
The issue is reachable before authentication during the TLS 1.3 handshake in configurations using MG_TLS_BUILTIN.
Affected software
Mongoose
How to mitigate CVE-2026-73252
Install security update from vendor's website.
Mongoose - update to 7.23