Out-of-bounds read in Mongoose - CVE-2026-52053
Published: August 12, 2026
Vulnerability identifier: #VU142192
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-52053
CWE-ID: CWE-125
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service or disclose sensitive information.
The vulnerability exists due to out-of-bounds read in the rx_ip6() function when parsing crafted IPv6 extension headers. A remote attacker can send a specially crafted IPv6 packet to cause a denial of service or disclose sensitive information.
Exploitation requires access to the same local network segment and affects deployments using the built-in TCP/IP stack with MG_ENABLE_TCPIP enabled.
Affected software
Mongoose
How to mitigate CVE-2026-52053
Install security update from vendor's website.
Mongoose - update to 7.22