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 OTP 29.0.3, OTP 28.5.0.3 and OTP 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.
References
| Link | Resource |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-54891.html | Vendor Advisory |
| https://github.com/erlang/otp/commit/07d2d0e93f6aaf7652a81e8df075fc1728da5e96 | Patch |
| https://github.com/erlang/otp/security/advisories/GHSA-gf6r-99xw-6qg6 | Vendor Advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-54891 | Third Party Advisory |
| https://www.erlang.org/doc/system/versions.html#order-of-versions | Release Notes |
Configurations
Configuration 1 (hide)
|
History
24 Jul 2026, 15:18
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (en) 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 OTP 29.0.3, OTP 28.5.0.3 and OTP 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. |
07 Jul 2026, 14:46
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://cna.erlef.org/cves/CVE-2026-54891.html - Vendor Advisory | |
| References | () https://github.com/erlang/otp/commit/07d2d0e93f6aaf7652a81e8df075fc1728da5e96 - Patch | |
| References | () https://github.com/erlang/otp/security/advisories/GHSA-gf6r-99xw-6qg6 - Vendor Advisory | |
| References | () https://osv.dev/vulnerability/EEF-CVE-2026-54891 - Third Party Advisory | |
| References | () https://www.erlang.org/doc/system/versions.html#order-of-versions - Release Notes | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 3.7 |
| CPE | cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* cpe:2.3:a:erlang:erlang\/ssl:*:*:*:*:*:*:*:* |
|
| First Time |
Erlang erlang\/ssl
Erlang erlang\/otp Erlang |
02 Jul 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-02 17:17
Updated : 2026-07-24 15:18
NVD link : CVE-2026-54891
Mitre link : CVE-2026-54891
CVE.ORG link : CVE-2026-54891
JSON object : View
Products Affected
erlang
- erlang\/ssl
- erlang\/otp
CWE
CWE-924
Improper Enforcement of Message Integrity During Transmission in a Communication Channel