Improper Validation of Specified Quantity in Input in otp - CVE-2026-55952
Published: July 2, 2026
Vulnerability identifier: #VU136823
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-55952
CWE-ID: CWE-1284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: erlang
Affected software:
otp
otp
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper validation of specified quantity in input in the TLS-1.3 session ticket handler when processing a malformed ClientHello with mismatched PSK identity and binder list lengths. A remote attacker can send a specially crafted ClientHello message to cause a denial of service.
Only TLS-1.3 servers with session tickets enabled are vulnerable. TLS-1.2 connections are not affected.
How to mitigate CVE-2026-55952
Install security update from vendor's website.