erlang: Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP respon...
CVE-2026-42791 is fixed in 37 products on 1 platform, first by SUSE-SU-2026:22082-1, released June 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| erlang · Debian 13.5 (trixie) | 1:27.3.4.1+dfsg-1+deb13u3 | DEBIAN-CVE-2026-42791 | Jun 24, 2026 |
| erlang · Debian 14 | 1:27.3.4.12+dfsg-1 | DEBIAN-CVE-2026-42791 | Jun 24, 2026 |
| erlang · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang · opensuse-leap 16.0 | 27.1.3-160000.5.1 | OPENSUSE-SU-2026:20907-1 | Jun 5, 2026 |
| erlang · sles 16.0 | 27.1.3-160000.5.1 | SUSE-SU-2026:22082-1 | Jun 5, 2026 |
| erlang-asn1 · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-asn1 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-base · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-base 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-common-test · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-common-test 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-crypto · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-crypto 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-debugger · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-debugger 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-dialyzer · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-dialyzer 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-diameter · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-diameter 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-edoc · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-edoc 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-eldap · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-eldap 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-et · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-et 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-eunit · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-eunit 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-examples · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-examples 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-ftp · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-ftp 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-inets · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-inets 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-jinterface · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-jinterface 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-megaco · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-megaco 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-mnesia · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-mnesia 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-mode · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-mode 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-nox · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-nox 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-observer · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-observer 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-odbc · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-odbc 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-os-mon · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-os-mon 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-parsetools · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-parsetools 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-public-key · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-public-key 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-reltool · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-reltool 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-runtime-tools · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-runtime-tools 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-snmp · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-snmp 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-src · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-src 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-ssh · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-ssh 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-ssl · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-ssl 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-syntax-tools · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-syntax-tools 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-tftp · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-tftp 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-tools · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-tools 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-wx · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-wx 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-x11 · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-x11 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
| erlang-xmerl · Ubuntu 26.04.1 LTS (resolute) | 1:27.3.4.6+dfsg-1ubuntu0.2 | erlang-xmerl 1:27.3.4.6+dfsg-1ubuntu0.2 | Sep 22, 2026 |
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