{"affected":[{"ranges":[{"events":[{"introduced":"e594aad2f87aab39e99fccf9e021bc94e0bbf7d4"},{"fixed":"888e3bcd72d5406016b9e0de741026bc2a6f114d"}],"repo":"https://github.com/erlang/otp","type":"GIT"}]}],"aliases":["GHSA-p2m2-3c2w-8jp8","CVE-2026-54887"],"credits":[{"name":"Lukas Backström","type":"FINDER"},{"name":"Ingela Anderton Andin","type":"REMEDIATION_DEVELOPER"},{"name":"Dan Gudmundsson","type":"REMEDIATION_REVIEWER"}],"database_specific":{"capec_ids":["CAPEC-485"],"cpe_ids":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-1394"]},"details":"## Summary\n\nUse of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass.\n\nOn DTLS server startup, dtls\\_server\\_connection:initial\\_hello/3 initializes previous\\_cookie\\_secret to the empty binary (<<>>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext ClientHello can compute dtls\\_handshake:cookie(<<>>, IP, Port, Hello) and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext ClientHello can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses.\n\nThis vulnerability is associated with program file lib/ssl/src/dtls\\_server\\_connection.erl and program routine dtls\\_server\\_connection:initial\\_hello/3.\n\nThis issue affects OTP from OTP 20.0 before 29.0.3, 28.5.0.3 and 27.3.4.14 corresponding to ssl from 8.2 before 11.7.3, 11.6.0.3 and 11.2.12.10.","id":"EEF-CVE-2026-54887","modified":"2026-07-02T16:06:04.156Z","published":"2026-07-02T16:06:04.156Z","references":[{"type":"ADVISORY","url":"https://github.com/erlang/otp/security/advisories/GHSA-p2m2-3c2w-8jp8"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-54887.html"},{"type":"WEB","url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"},{"type":"FIX","url":"https://github.com/erlang/otp/commit/888e3bcd72d5406016b9e0de741026bc2a6f114d"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"DTLS server cookie bypass during startup window due to empty initial cookie secret","upstream":[]}