Low [CVE-2026-54891] Unauthenticated data injection during TLS handshake
This low-severity Red Hat Linux advisory covers CVE-2026-54891 affecting Red Hat Hardened Images, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1.
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Summary
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.
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.
TLS 1.3 is affected starting with OTP 22.0, when TLS 1.3 support was added. This issue affects OTP from OTP R13B03 before OTP 27.3.4.14, from OTP 28.0 before OTP 28.5.0.3, and from OTP 29.0 before OTP 29.0.3, corresponding to ssl from 3.10.7 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3.
A flaw was found in Erlang's SSL (Secure Sockets Layer) component.
- < 1.3
- < 27.3.4.14
- < 28.0
- < 28.5.0.3
- < 29.0
- < 29.0.3
- < 3.10.7
- < 11.2.12.10
- < 11.3
- < 11.6.0.3
- < 11.7
- < 11.7.3
- 22.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- erlang27-main-27.3.4.17-1.hum1
- RHSA-2026:63160
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation
Upgrade to a fixed release: erlang27-main-27.3.4.17-1.hum1, RHSA-2026:63160. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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