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CVE-2026-42791

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6d2215c6fadf66dd9a05cac062bd7797f250dfef2bd3c875138e9635ee49c591
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_ocsp"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/public_key/src/pubkey_ocsp.erl"],"programRoutines":[{"name":"pubkey_ocsp:verify_response/5"},{"name":"pubkey_ocsp:is_authorized_responder/3"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"27.3.4.12","status":"unaffected"},{"at":"28.5.0.1","status":"unaffected"},{"at":"29.0.1","status":"unaffected"}],"lessTha…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/affected/1

{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_ocsp"],"packageName":"public_key","packageURL":"pkg:otp/public_key?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/pubkey_ocsp.erl"],"programRoutines":[{"name":"pubkey_ocsp:verify_response/5"},{"name":"pubkey_ocsp:is_authorized_responder/3"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"1.17.1.3","status":"unaffected"},{"at":"1.20.3.1","status":"unaffec…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/affected/0
cwe · 2 assertions

{"cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-672","description":"CWE-672 Operation on a Resource after Expiration or Release","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_ocsp"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/public_key/src/pubkey_ocsp.erl"],"programRoutines":[{"name":"pubkey_ocsp:verify_response/5"},{"name":"pubkey_ocsp:is_authorized_responder/3"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"27.3.4.12","status":"unaffected"},{"at":"28.5.0.1","status":"unaffected"},{"at":"29.0.1","status":"unaffected"}],"lessTha…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/affected/1
{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["pubkey_ocsp"],"packageName":"public_key","packageURL":"pkg:otp/public_key?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/pubkey_ocsp.erl"],"programRoutines":[{"name":"pubkey_ocsp:verify_response/5"},{"name":"pubkey_ocsp:is_authorized_responder/3"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"1.17.1.3","status":"unaffected"},{"at":"1.20.3.1","status":"unaffec…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-295","description":"CWE-295 Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-672","description":"CWE-672 Operation on a Resource after Expiration or Release","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/problemTypes/0/descriptions/1

Source references

6 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-42791.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/7995f1fdaee3da569bb810358ce0f546471d169b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/b3870e02405c709a872b01ba6086065620cdfe76"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/5
{"tags":["vendor-advisory","related"],"url":"https://github.com/erlang/otp/security/advisories/GHSA-cjxj-wj6x-3fff"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-42791"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/2
{"tags":["x_version-scheme"],"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:667443a085230a45411ecd5f4503c9fb8c2dfaf800dc34f21170ccfdb7148840 · sha256:2cbc8cdc25b4283d… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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