{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-89422 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-89422 is a critical vulnerability in Erlang OTP, published on 22 Sep 2026."},"fix_prompt":"Check this codebase for CVE-2026-89422 and fix it if it is affected.\n\nWhat it is: CVE-2026-89422 is a critical vulnerability in Erlang OTP, published on 22 Sep 2026. \nExploitation: There is no known exploitation of CVE-2026-89422 in the wild and no public exploit code.\n\nAffected product: Erlang OTP. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-89422/ (Markdown: https://insights.sbomify.com/CVE-2026-89422/index.md)","id":"CVE-2026-89422","markdown":"https://insights.sbomify.com/CVE-2026-89422/index.md","name":"CVE-2026-89422","record":{"aliases":["AZL-103428","DEBIAN-CVE-2026-89422","EEF-CVE-2026-89422","GHSA-rgxr-4g4w-j875","UBUNTU-CVE-2026-89422"],"analysis":null,"analysis_generated_by":null,"assigner":"EEF","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-322","name":"Key Exchange without Entity Authentication"}],"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.\n\ntls_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.\n\nThis 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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension","id":"CVE-2026-89422","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"Duplicate Post \u003c= 1.5.6 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'noti_token' Parameter","id":"CVE-2026-89424"},"packages":[],"prev":{"headline":"Session voucher adding no new funds is accepted without a charge in mpp, serving paid resources for free","id":"CVE-2026-89420"},"products":["OTP"],"published":"2026-09-22","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-22","vendors":["Erlang"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-89422/"}