{"affected":[{"defaultStatus":"unaffected","ecosystem":"software-id","packageName":"otp","product":"OTP","source":"CNA: EEF","vendor":"Erlang","versions":[{"changes":[{"at":"27.3.4.14","status":"unaffected"},{"at":"28.5.0.3","status":"unaffected"},{"at":"29.0.3","status":"unaffected"}],"lessThan":"*","status":"affected","version":"22.2","versionType":"otp"}]},{"defaultStatus":"unaffected","ecosystem":"otp","packageName":"ssl","product":"OTP","source":"CNA: EEF","vendor":"Erlang","versions":[{"changes":[{"at":"11.2.12.10","status":"unaffected"},{"at":"11.6.0.3","status":"unaffected"},{"at":"11.7.3","status":"unaffected"}],"lessThan":"*","status":"affected","version":"9.5","versionType":"otp"}]},{"defaultStatus":"unaffected","ecosystem":"github","packageName":"erlang/otp","product":"OTP","source":"CNA: EEF","vendor":"Erlang","versions":[{"changes":[{"at":"095f744713c325acdbd18c23e397f04593c06275","status":"unaffected"},{"at":"e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce","status":"unaffected"},{"at":"2c3e599797644310e5d4aa39c7193420e59dadff","status":"unaffected"},{"at":"9b5437c72fa3403a75c1aba28e5c532bc191c662","status":"unaffected"}],"lessThan":"*","status":"affected","version":"339a279f02ce38a7b23010e56000613e19abb21f","versionType":"git"}]}],"cveId":"CVE-2026-55952","cwes":["CWE-1284"],"description":"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.\n\nAn 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.\n\nThis issue affects OTP from OTP 22.2 before OTP 27.3.4.14, OTP 28.5.0.3, and OTP 29.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.","epss":{"date":"2026-11-10","percentile":0.41785,"score":0.00481},"exploits":[],"kev":null,"metrics":[{"score":8.2,"severity":"high","source":"CNA: EEF","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1794409112325,"publishedAt":1783008368474,"references":[{"source":"CNA: EEF","tags":["vendor-advisory","related"],"url":"https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59"},{"source":"CNA: EEF","tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-55952.html"},{"source":"CNA: EEF","tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-55952"},{"source":"CNA: EEF","tags":["x_version-scheme"],"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"},{"source":"CNA: EEF","tags":["related"],"url":"https://github.com/erlang/otp/commit/339a279f02ce38a7b23010e56000613e19abb21f"},{"source":"CNA: EEF","tags":["patch"],"url":"https://github.com/erlang/otp/commit/095f744713c325acdbd18c23e397f04593c06275"},{"source":"CNA: EEF","tags":["patch"],"url":"https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce"},{"source":"CNA: EEF","tags":["patch"],"url":"https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff"},{"source":"CNA: EEF","tags":["patch"],"url":"https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662"}],"remediation":[{"kind":"workaround","source":"CNA: EEF","text":"* Disable session tickets on TLS 1.3 servers by setting session_tickets to disabled in the server's ssl options.\n* Restrict the server to TLS 1.2 by setting versions to ['tlsv1.2'] in the server's ssl options."},{"kind":"fix","source":"CNA: EEF","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/erlang/otp/commit/095f744713c325acdbd18c23e397f04593c06275"},{"kind":"fix","source":"CNA: EEF","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce"},{"kind":"fix","source":"CNA: EEF","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff"},{"kind":"fix","source":"CNA: EEF","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662"}],"revision":"e4897e945a6957ffe92b2d221484c442b9cb0d641cee309c50032e01cc55536e","sources":[{"modifiedAt":1794409112325,"name":"CNA: EEF","retrievedAt":1794409736928,"url":"https://www.cve.org/CVERecord?id=CVE-2026-55952"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794409763233,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55952"}],"ssvc":{"assessedAt":1783013289569,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension","updatedAt":1794409763233}