CVE-2026-54891
published 2026-07-02CVE-2026-54891: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a…
PriorityP418low3.7CVSS 3.1
AVNACHPRNUINSUCNILAN
EPSS
0.14%
3.4th percentile
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.
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. Whether OTP before OTP R13B03, corresponding to ssl before 3.10.7, is affected is unknown.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | erlang | — | — |
| erlang | erlang_otp | >= 17.0 < 27.3.4.14 | 27.3.4.14 |
| erlang | erlang_otp | >= 28.0 < 28.5.0.3 | 28.5.0.3 |
| erlang | erlang_otp | >= 29.0 < 29.0.3 | 29.0.3 |
| erlang | erlang_ssl | >= 11.3 < 11.6.0.3 | 11.6.0.3 |
| erlang | erlang_ssl | >= 11.7 < 11.7.3 | 11.7.3 |
| erlang | erlang_ssl | >= 5.3.4 < 11.2.12.10 | 11.2.12.10 |
| erlang | otp | >= 11.3 < 11.6.0.3 | 11.6.0.3 |
| erlang | otp | >= 11.7 < 11.7.3 | 11.7.3 |
| erlang | otp | >= 28.0 < 28.5.0.3 | 28.5.0.3 |
| erlang | otp | >= 29.0 < 29.0.3 | 29.0.3 |
| erlang | otp | >= 3.10.7 < 11.2.12.10 | 11.2.12.10 |
| erlang | otp | >= 84adefa331c4159d432d22840663c38f155cd4c1 < 07d2d0e93f6aaf7652a81e8df075fc1728da5e96 | 07d2d0e93f6aaf7652a81e8df075fc1728da5e96 |
| erlang | otp | >= R13B03 < 27.3.4.14 | 27.3.4.14 |
CVSS provenance
nvdv3.13.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
nvdv4.06.3MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat6.3MEDIUM
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VulDB
Erlang OTP up to 29.0.2 TLS Endpoint tls_gen_connection.erl message integrity
vuldb·2026-07-02·CVSS 6.3
CVE-2026-54891 [MEDIUM] Erlang OTP up to 29.0.2 TLS Endpoint tls_gen_connection.erl message integrity
A vulnerability, which was classified as critical, was found in Erlang OTP up to 29.0.2. This vulnerability affects unknown code in the library lib/ssl/src/tls_gen_connection.erl of the component TLS Endpoint. The manipulation results in improper enforcement of message integrity.
This vulnerability is reported as CVE-2026-54891. The attacker must have access to the local network to execute the attack. No exploit exists.
You should upgrade the affected component.
Red Hat
erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
vendor_redhat·2026-07-02·CVSS 6.3
CVE-2026-54891 [MEDIUM] CWE-924 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
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 t
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [fedora-all]
bugzilla·2026-07-03·CVSS 6.3
CVE-2026-54891 [MEDIUM] CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [fedora-all]
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 n
Bugzilla
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [epel-all]
bugzilla·2026-07-03·CVSS 6.3
CVE-2026-54891 [MEDIUM] CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [epel-all]
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
bugzilla·2026-07-02·CVSS 6.3
CVE-2026-54891 [MEDIUM] CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
CVE-2026-54891 erlang: Erlang SSL: Unauthenticated data injection during TLS handshake
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 successfu
https://cna.erlef.org/cves/CVE-2026-54891.htmlhttps://github.com/erlang/otp/commit/07d2d0e93f6aaf7652a81e8df075fc1728da5e96https://github.com/erlang/otp/security/advisories/GHSA-gf6r-99xw-6qg6https://osv.dev/vulnerability/EEF-CVE-2026-54891https://www.erlang.org/doc/system/versions.html#order-of-versions
2026-07-02
Published