CVE-2026-42766 (GCVE-0-2026-42766)

Vulnerability from cvelistv5 – Published: 2026-06-09 16:03 – Updated: 2026-06-10 07:48
VLAI
Title
Possible NULL Dereference in Password-Based CMS Decryption
Summary
Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present. An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service. Applications that process password-encrypted CMS messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 4.0.0 , < 4.0.1 (semver)
Affected: 3.6.0 , < 3.6.3 (semver)
Affected: 3.5.0 , < 3.5.7 (semver)
Affected: 3.4.0 , < 3.4.6 (semver)
Affected: 3.0.0 , < 3.0.21 (semver)
Affected: 1.1.1 , < 1.1.1zh (custom)
Affected: 1.0.2 , < 1.0.2zq (custom)
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Date Public
2026-06-09 14:00
Credits
Mayank Jangid Kushal Khemka Hari Priandana Bhabani Sankar Das Qifan Zhang (Palo Alto Networks) Igor Ustinov
Show details on NVD website
To clipboard 

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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42766\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-09T19:46:24.673332Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-09T19:46:17.520Z\"}}], \"cna\": {\"title\": \"Possible NULL Dereference in Password-Based CMS Decryption\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Mayank Jangid\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Kushal Khemka\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Hari Priandana\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Bhabani Sankar Das\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Qifan Zhang (Palo Alto Networks)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Igor Ustinov\"}], \"metrics\": [{\"other\": {\"type\": \"https://openssl-library.org/policies/general/security-policy/\", \"content\": {\"text\": \"Low\"}}, \"format\": \"other\"}], \"affected\": [{\"vendor\": \"OpenSSL\", \"product\": \"OpenSSL\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.0.0\", \"lessThan\": \"4.0.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.5.0\", \"lessThan\": \"3.5.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.4.0\", \"lessThan\": \"3.4.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.0.0\", \"lessThan\": \"3.0.21\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.1.1\", \"lessThan\": \"1.1.1zh\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"1.0.2\", \"lessThan\": \"1.0.2zq\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-06-09T14:00:00.000Z\", \"references\": [{\"url\": \"https://openssl-library.org/news/secadv/20260609.txt\", \"name\": \"OpenSSL Advisory\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4\", \"name\": \"4.0.1 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8\", \"name\": \"3.6.3 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce\", \"name\": \"3.5.7 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4\", \"name\": \"3.4.6 git commit\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7\", \"name\": \"3.0.21 git commit\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Issue summary: A specially crafted password-encrypted CMS message\\ncan trigger a NULL pointer dereference during CMS decryption.\\n\\nImpact summary: This NULL pointer dereference leads to an application crash\\nand a Denial of Service.\\n\\nThe CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as\\nOPTIONAL in the ASN.1 specification and may therefore be absent in specially\\ncrafted inputs. During the password-based CMS decryption the OpenSSL\\nCMS implementation dereferences this field without first checking whether it\\nwas present.\\n\\nAn attacker who supplies such a CMS message to an application performing\\npassword-based CMS decryption can trigger an application crash, leading to\\na Denial of Service.\\n\\nApplications that process password-encrypted CMS messages may be affected.\\n\\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\\nissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: A specially crafted password-encrypted CMS message\u003cbr\u003ecan trigger a NULL pointer dereference during CMS decryption.\u003cbr\u003e\u003cbr\u003eImpact summary: This NULL pointer dereference leads to an application crash\u003cbr\u003eand a Denial of Service.\u003cbr\u003e\u003cbr\u003eThe CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as\u003cbr\u003eOPTIONAL in the ASN.1 specification and may therefore be absent in specially\u003cbr\u003ecrafted inputs. During the password-based CMS decryption the OpenSSL\u003cbr\u003eCMS implementation dereferences this field without first checking whether it\u003cbr\u003ewas present.\u003cbr\u003e\u003cbr\u003eAn attacker who supplies such a CMS message to an application performing\u003cbr\u003epassword-based CMS decryption can trigger an application crash, leading to\u003cbr\u003ea Denial of Service.\u003cbr\u003e\u003cbr\u003eApplications that process password-encrypted CMS messages may be affected.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\u003cbr\u003eissue, as the affected code is outside the OpenSSL FIPS module boundary.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-06-10T07:48:01.992Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42766\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-10T07:48:01.992Z\", \"dateReserved\": \"2026-04-29T09:22:27.968Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-06-09T16:03:26.679Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.