Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-07-02T16:06:30 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CWE-924

Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data. The function tls_gen_connection:handle_protocol_record/3 rejects APPLICATION_DATA records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext APPLICATION_DATA records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client's response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3. This vulnerability is associated with program file lib/ssl/src/tls_gen_connection.erl. This issue affects OTP from OTP 17.0 before 29.0.3, 28.5.0.3 and 27.3.4.14 corresponding to ssl from 5.3.4 before 11.7.3, 11.6.0.3 and 11.2.12.10. TLS 1.3 is affected starting with OTP 22.0, when TLS 1.3 support was added.

A flaw was found in Erlang's SSL (Secure Sockets Layer) component. A network-positioned attacker can exploit this vulnerability by injecting unauthenticated plaintext data into a client's TLS (Transport Layer Security) handshake. The client application may then process this injected data as if it were legitimate, authenticated server data. This could lead to the blind injection of unauthenticated bytes, potentially impacting the integrity of the communication.

Red Hat OpenStack Platform 16.2 Fix deferred erlang Red Hat OpenStack Platform 17.1 Fix deferred erlang Red Hat OpenStack Platform 18.0 Fix deferred erlang https://www.cve.org/CVERecord?id=CVE-2026-54891 https://nvd.nist.gov/vuln/detail/CVE-2026-54891 https://cna.erlef.org/cves/CVE-2026-54891.html https://github.com/erlang/otp/commit/07d2d0e93f6aaf7652a81e8df075fc1728da5e96 https://github.com/erlang/otp/security/advisories/GHSA-gf6r-99xw-6qg6 https://osv.dev/vulnerability/EEF-CVE-2026-54891 https://www.erlang.org/doc/system/versions.html#order-of-versions