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CVE Vulnerability Details :
CVE-2026-42766
PUBLISHED
More InfoOfficial Page
Assigner-openssl
Assigner Org ID-3a12439a-ef3a-4c79-92e6-6081a721f1e5
View Known Exploited Vulnerability (KEV) details
Published At-09 Jun, 2026 | 16:03
Updated At-10 Jun, 2026 | 07:48
Rejected At-
▼CVE Numbering Authority (CNA)
Possible NULL Dereference in Password-Based CMS Decryption

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.

Affected Products
Vendor
OpenSSLOpenSSL
Product
OpenSSL
Default Status
unaffected
Versions
Affected
  • From 4.0.0 before 4.0.1 (semver)
  • From 3.6.0 before 3.6.3 (semver)
  • From 3.5.0 before 3.5.7 (semver)
  • From 3.4.0 before 3.4.6 (semver)
  • From 3.0.0 before 3.0.21 (semver)
  • From 1.1.1 before 1.1.1zh (custom)
  • From 1.0.2 before 1.0.2zq (custom)
Problem Types
TypeCWE IDDescription
CWECWE-476CWE-476 NULL Pointer Dereference
Type: CWE
CWE ID: CWE-476
Description: CWE-476 NULL Pointer Dereference
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
https://openssl-library.org/policies/general/security-policy/
text:
Low
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

reporter
Mayank Jangid
reporter
Kushal Khemka
reporter
Hari Priandana
reporter
Bhabani Sankar Das
reporter
Qifan Zhang (Palo Alto Networks)
remediation developer
Igor Ustinov
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://openssl-library.org/news/secadv/20260609.txt
vendor-advisory
https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
patch
https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
patch
https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce
patch
https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
patch
https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
patch
Hyperlink: https://openssl-library.org/news/secadv/20260609.txt
Resource:
vendor-advisory
Hyperlink: https://github.com/openssl/openssl/commit/12bc26ffb3a2be728c9b86e1cae277de5b33dfa4
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/da26f368732b83e40e9d356fe61c3d3aaab6d2e8
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/056d06c1918fafbb98c1c85a02e4c47cc4e199ce
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/ab52d88cb5374876d59aee3c91f9e4ccce2b7ce4
Resource:
patch
Hyperlink: https://github.com/openssl/openssl/commit/3ff64913615d648cfbb6a6f1cf5529ae7ea829d7
Resource:
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.15.9MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Details not found