Use of Default Cryptographic Key in otp - CVE-2026-54887
Published: July 2, 2026
Vulnerability identifier: #VU136827
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-54887
CWE-ID: CWE-1394
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 bypass DTLS address verification.
The vulnerability exists due to use of a default cryptographic key in the DTLS cookie handling during server startup when processing a plaintext ClientHello before the first cookie secret rotation. A remote attacker can compute and submit a valid forged cookie to bypass DTLS address verification.
The issue is limited to the startup window before the first secret rotation, approximately 0 to 15 seconds, and requires observing the plaintext ClientHello contents.
How to mitigate CVE-2026-54887
Install security update from vendor's website.