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CVE-2026-89422— TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension

一分钟漏洞结论

影响对象
Erlang OTP
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client

CVSS 9.3 · Critical EPSS 0.37% · P31

影响版本矩阵 3

厂商产品 版本范围状态
Erlang OTP 22.2< * affected
9.5< * affected
21b8a1b0ad0adf200682b3854bc50114ab2b8c62< * affected
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一、 漏洞 CVE-2026-89422 基础信息

漏洞信息

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Vulnerability Title
TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension
来源: CVE Program / CVE List V5
Vulnerability Description
Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session. tls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero "no PSK" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not. This issue affects OTP from OTP 22.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
未进行实体认证的密钥交换
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
Erlang OTP 22.2 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 9.5 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 21b8a1b0ad0adf200682b3854bc50114ab2b8c62 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

二、漏洞 CVE-2026-89422 的公开POC

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三、漏洞 CVE-2026-89422 的情报信息

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CVE-2026-89422 补丁与修复 (4)

CVE-2026-89422 其他参考 (3)

同批安全公告 · Erlang · 2026-09-22 · 共 3 条

CVE-2026-65634 8.2 HIGH Superlinear CPU denial of service in Erlang/OTP ASN.1 OBJECT IDENTIFIER decoder
CVE-2026-68956 7.1 HIGH SSH daemon allocates unbounded idle session channels, bypassing max_channels

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-322

V. Comments for CVE-2026-89422

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