Improper Enforcement of Message Integrity During Transmission in a Communication Channel in otp - CVE-2026-54891
Published: July 2, 2026
Vulnerability identifier: #VU136825
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-54891
CWE-ID: CWE-924
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 inject plaintext data into a TLS client application.
The vulnerability exists due to improper enforcement of message integrity during transmission in the (d)tls client handshake handling when a man-in-the-middle interferes before the handshake completes. A remote attacker can inject plaintext data before handshake completion to inject plaintext data into a TLS client application.
The injected data may be delivered to the client application after a successful handshake. The injection window is smaller for TLS 1.3 than for earlier TLS versions.
How to mitigate CVE-2026-54891
Install security update from vendor's website.