{"schemaVersion":3,"id":"CVE-2026-42765","aliases":["UBUNTU-CVE-2026-42765","DEBIAN-CVE-2026-42765","CGA-423r-p3g2-v2wq","CGA-4m7p-5hcw-cpv8","CGA-rgfj-c398-6gv5","CGA-xj7p-6685-j9jr","CGA-2m7r-rvfx-699m","CGA-5vfq-g5rh-8fg4","CGA-8p7p-w96p-vvch","CGA-cc59-fgwr-8jh8","CGA-cgx4-pgc3-m5ph","CGA-pvph-7wwm-qc56"],"status":"published","duplicateOf":null,"title":null,"description":"Issue summary: When a partial-chain certificate verification is enabled\ntogether with OCSP response checking for the whole chain, a NULL dereference\nwill happen if the verified chain does not have a self-signed trusted anchor,\ncrashing the process.\n\nImpact summary: A NULL pointer dereference can trigger a crash which leads to a\nDenial of Service for an application.\n\nWhen performing OCSP response checking for certificates in the verification\nchain, the code always tries to access the next certificate as the issuer.\nThere is a check for a self-signed certificate. However with the partial\nchain verification enabled when the chain does not have a self-signed trusted\nanchor, the issuer will be NULL for the last certificate in the chain. A NULL\npointer dereference then happens.\n\nThis issue affects only applications which enable both OCSP verification\nof the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial\nchain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate\nverification. Both flags are disabled by default. For that reason, we have\nassigned Low severity to the issue.\n\nNo FIPS modules are affected by this issue as the affected code is outside\nthe OpenSSL FIPS module boundary.","dates":{"published":"2026-06-09T16:03:25.934Z","modified":"2026-06-10T07:48:00.427Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Wolfi","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Chainguard","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00477,"percentile":0.39828,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-0.031000000000000038,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00508},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00477,"percentile":0.39828}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00508,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00477,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00477,"percentile":0.39828}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"chainguard","product":"libcrypto3","name":"libcrypto3","label":"libcrypto3","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/libcrypto3","purlType":"apk","versions":[{"text":"< 3.6.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-r0","eol":null,"hubHref":null},{"vendor":"chainguard","product":"libcrypto3-2.34","name":"libcrypto3-2.34","label":"libcrypto3-2.34","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/libcrypto3-2.34","purlType":"apk","versions":[{"text":"< 3.6.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-r0","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl","purlType":"apk","versions":[{"text":"< 3.6.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-r0","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.6.0","name":"openssl-provider-fips-3.6.0","label":"openssl-provider-fips-3.6.0","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.6.0","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.6.0-dbg","name":"openssl-provider-fips-3.6.0-dbg","label":"openssl-provider-fips-3.6.0-dbg","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.6.0-dbg","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"wolfi","product":"libcrypto3","name":"libcrypto3","label":"libcrypto3","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/libcrypto3","purlType":"apk","versions":[{"text":"< 3.6.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-r0","eol":null,"hubHref":null},{"vendor":"wolfi","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/openssl","purlType":"apk","versions":[{"text":"< 3.6.3-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/openssl","purlType":"deb","versions":[{"text":"< 3.6.3-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.3-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"nodejs","name":"nodejs","label":"nodejs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nodejs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"openssl","product":"openssl","name":"OpenSSL","label":"openssl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, < 4.0.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.6.0, < 3.6.3","noFixRecorded":false,"fixedIn":null},{"text":"4.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 4.0.1 | ≥ 3.6.0, < 3.6.3 | 4.0.0","eol":{"isEol":false,"eolDate":"2027-05-14T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"4.0","label":"4.0","eolFrom":"2027-05-14T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"4.0.3"},"product":{"name":"openssl","label":"OpenSSL","category":"framework"}},"hubHref":"/vendor/openssl/openssl"}],"affectedCount":10,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://openssl-library.org/news/secadv/20260609.txt","label":"openssl-library.org/news/secadv/20260609.txt","hostname":"openssl-library.org","tags":["Vendor Advisory","Advisory"]},{"url":"https://github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334","label":"github.com/openssl/openssl/commit/14340b7fa1d444615486bc137014b064e64ec334","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97","label":"github.com/openssl/openssl/commit/eb345da18ce2216b2f3ade9c2bc23e068487fa97","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://ubuntu.com/security/CVE-2026-42765","label":"ubuntu.com/security/CVE-2026-42765","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42765","label":"www.cve.org/CVERecord?id=CVE-2026-42765","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-42765","label":"security-tracker.debian.org/tracker/CVE-2026-42765","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42765.json","label":"github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42765.json","hostname":"github.com","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42765","label":"nvd.nist.gov/vuln/detail/CVE-2026-42765","hostname":"nvd.nist.gov","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:42825","RHSA-2026:55543","RHSA-2026:59635","RHSA-2026:59641","RHSA-2026:62562","RHSA-2026:62563","RHSA-2026:62790","RHSA-2026:67551"],"duplicates":[],"related":["CGA-2R3F-8XVR-3672"]},"timeline":[{"kind":"published","date":"2026-06-09T16:03:25.934Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-10T07:48:00.427Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T06:49:09.004Z","stale":false,"partial":false}}