The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.
An unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.
This issue affects OTP from OTP 22.2 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10.
References
| Link | Resource |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-55952.html | Mitigation Vendor Advisory |
| https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff | Patch |
| https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662 | Patch |
| https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce | Patch |
| https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59 | Vendor Advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-55952 | Mitigation 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) The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process. An unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected. This issue affects OTP from OTP 22.2 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10. |
07 Jul 2026, 14:44
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| References | () https://cna.erlef.org/cves/CVE-2026-55952.html - Mitigation, Vendor Advisory | |
| References | () https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff - Patch | |
| References | () https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662 - Patch | |
| References | () https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce - Patch | |
| References | () https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59 - Vendor Advisory | |
| References | () https://osv.dev/vulnerability/EEF-CVE-2026-55952 - Mitigation, Third Party Advisory | |
| References | () https://www.erlang.org/doc/system/versions.html#order-of-versions - Release Notes | |
| First Time |
Erlang erlang\/ssl
Erlang erlang\/otp Erlang |
|
| CPE | cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* cpe:2.3:a:erlang:erlang\/ssl:*:*:*:*:*:*:*:* |
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-2026-55952
Mitre link : CVE-2026-55952
CVE.ORG link : CVE-2026-55952
JSON object : View
Products Affected
erlang
- erlang\/ssl
- erlang\/otp
CWE
CWE-1284
Improper Validation of Specified Quantity in Input