{"id":"UBUNTU-CVE-2026-42791","details":"Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP responses signed with an expired responder certificate to be accepted as valid. OCSP response verification in pubkey_ocsp:verify_response/5 and pubkey_ocsp:is_authorized_responder/3 in lib/public_key/src/pubkey_ocsp.erl does not check the validity period (notBefore/notAfter) of the OCSP responder certificate. An attacker who has obtained the private key of an expired CA-designated OCSP responder certificate can forge OCSP responses that Erlang/OTP accepts as valid. This affects TLS clients using OCSP stapling via the ssl application: a malicious or compromised server can present a revoked TLS certificate together with a forged OCSP response signed by an expired responder key, and the client will accept the revoked certificate as valid. It also affects applications calling public_key:pkix_ocsp_validate/5 directly, where the impact depends on the use case — server-side client certificate validation using this API may allow authentication bypass with a revoked client certificate. This issue affects OTP from OTP 27.0 before OTP 29.0.1, OTP 28.5.0.1 and OTP 27.3.4.12, corresponding to public_key from 1.16 before 1.21.1, 1.20.3.1 and 1.17.1.3.","modified":"2026-07-29T10:18:19.845186209Z","published":"2026-05-27T14:16:00Z","upstream":["CVE-2026-42791"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42791"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-42791"},{"type":"REPORT","url":"https://github.com/erlang/otp/security/advisories/GHSA-cjxj-wj6x-3fff"},{"type":"REPORT","url":"https://cna.erlef.org/cves/CVE-2026-42791.html"},{"type":"REPORT","url":"https://osv.dev/vulnerability/EEF-CVE-2026-42791"},{"type":"REPORT","url":"https://github.com/erlang/otp/commit/7995f1fdaee3da569bb810358ce0f546471d169b"},{"type":"REPORT","url":"https://github.com/erlang/otp/commit/b3870e02405c709a872b01ba6086065620cdfe76"},{"type":"REPORT","url":"https://github.com/erlang/otp/commit/7995f1fdaee3da569bb810358ce0f546471d169b"},{"type":"REPORT","url":"https://github.com/erlang/otp/commit/b3870e02405c709a872b01ba6086065620cdfe76"},{"type":"REPORT","url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"}],"affected":[{"package":{"name":"erlang","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/erlang?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:16.b.1-dfsg-4ubuntu1","1:16.b.2-dfsg-1ubuntu1","1:16.b.2-dfsg-2ubuntu1","1:16.b.3-dfsg-1ubuntu1","1:16.b.3-dfsg-1ubuntu2","1:16.b.3-dfsg-1ubuntu2.1","1:16.b.3-dfsg-1ubuntu2.2","1:16.b.3-dfsg-1ubuntu2.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-appmon"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-asn1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-base"},{"binary_name":"erlang-base-hipe","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-common-test","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-corba","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-crypto"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-debugger"},{"binary_name":"erlang-dialyzer","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-diameter"},{"binary_name":"erlang-edoc","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-eldap","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-erl-docgen"},{"binary_name":"erlang-et","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-eunit"},{"binary_name":"erlang-examples","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-gs"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-ic"},{"binary_name":"erlang-ic-java","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-inets"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-jinterface"},{"binary_name":"erlang-manpages","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-megaco","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-mnesia","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-mode"},{"binary_name":"erlang-nox","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-observer","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-odbc","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-os-mon","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-parsetools","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-percept","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-pman","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-public-key","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-reltool","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-runtime-tools"},{"binary_name":"erlang-snmp","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-src","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-ssh","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-ssl"},{"binary_name":"erlang-syntax-tools","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_name":"erlang-test-server","binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1"},{"binary_version":"1:16.b.3-dfsg-1ubuntu2.2+esm1","binary_name":"erlang-toolbar"},{"bina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