{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35189","assignerOrgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","state":"PUBLISHED","assignerShortName":"openssl","dateReserved":"2026-04-01T17:36:26.323Z","datePublished":"2026-09-29T15:32:11.889Z","dateUpdated":"2026-09-30T20:11:09.577Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"4.0.3","status":"affected","version":"4.0.0","versionType":"semver"},{"lessThan":"3.6.5","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.9","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.8","status":"affected","version":"3.4.0","versionType":"semver"},{"lessThan":"3.0.23","status":"affected","version":"3.0.0","versionType":"semver"},{"lessThan":"1.1.1zj","status":"affected","version":"1.1.1","versionType":"custom"},{"lessThan":"1.0.2zs","status":"affected","version":"1.0.2","versionType":"custom"}]}],"credits":[{"lang":"en","type":"reporter","value":"Fuzz0x (ZKSC Institute of Security Research)"},{"lang":"en","type":"remediation developer","value":"Viktor Dukhovni"}],"datePublic":"2026-09-29T14:21:57.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Issue summary: A certificate with many nameRelativeToCRLIssuer CRL<br>distribution points causes disproportionate heap growth when OpenSSL caches<br>X.509 extensions.<br><br>Impact summary: Receiving a crafted certificate from a malicious peer can lead<br>to significant memory pressure and possible Denial of Service in clients or<br>in servers that solicit client certificates.<br><br>CWE: CWE-770: Allocation of Resources Without Limits or Throttling<br><br>Description: A certificate or a set of certificates that fits under the limit for<br>size of certificates accepted from the peer (~100 KiB) can result in allocation<br>of several hundred MiB of resident memory on the receiving side<br>during a normal TLS handshake.  This may be enough to crash the client or<br>server, if multiple concurrent connections lead to similarly large memory<br>allocations.<br><br>The fix postpones processing of the CRL distribution points extensions in<br>certificates to the time when the processed value is required for CRL processing.<br>This avoids keeping large memory allocations for a long time when such<br>certificates are received.<br><br>FIPS impact: no<br>The affected code is outside the FIPS module boundary."}],"value":"Issue summary: A certificate with many nameRelativeToCRLIssuer CRL\ndistribution points causes disproportionate heap growth when OpenSSL caches\nX.509 extensions.\n\nImpact summary: Receiving a crafted certificate from a malicious peer can lead\nto significant memory pressure and possible Denial of Service in clients or\nin servers that solicit client certificates.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: A certificate or a set of certificates that fits under the limit for\nsize of certificates accepted from the peer (~100 KiB) can result in allocation\nof several hundred MiB of resident memory on the receiving side\nduring a normal TLS handshake.  This may be enough to crash the client or\nserver, if multiple concurrent connections lead to similarly large memory\nallocations.\n\nThe fix postpones processing of the CRL distribution points extensions in\ncertificates to the time when the processed value is required for CRL processing.\nThis avoids keeping large memory allocations for a long time when such\ncertificates are received.\n\nFIPS impact: no\nThe affected code is outside the FIPS module boundary."}],"metrics":[{"format":"other","other":{"content":{"text":"Low"},"type":"https://openssl-library.org/policies/general/security-policy/"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","shortName":"openssl","dateUpdated":"2026-09-29T15:32:11.889Z"},"references":[{"name":"OpenSSL Advisory","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260929.txt"},{"name":"4.0.3 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/2b93c73b2c70ddc4c61c5e4bfaaa6bd71379eb84"},{"name":"3.6.5 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/8e0efc7549b7ff8246d40e585e3fd604f728473f"},{"name":"3.5.9 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/3842516cc15e8b2cf55747011045e77547e71d89"},{"name":"3.4.8 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/c72ae182cac17a82e4246c6ecd4e9c4ec3586ec9"}],"source":{"discovery":"UNKNOWN"},"title":"Excessive Memory Allocation in Relative CRLDP Processing","x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2026-35189","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-30T19:36:26.041392Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-30T20:11:09.577Z"}}]}}