CVE-2026-28389

HIGH EPSS 52.1%
Published Apr 7, 20262mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

Description

Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyAgreeRecipientInfo is processed, the optional parameters field of KeyEncryptionAlgorithmIdentifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
52.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
opensslopenssl*≥1.0.2  –  <1.0.2zp
opensslopenssl*≥1.1.1  –  <1.1.1zg
opensslopenssl*≥3.0.0  –  <3.0.20
opensslopenssl*≥3.3.0  –  <3.3.7
opensslopenssl*≥3.4.0  –  <3.4.5
opensslopenssl*≥3.5.0  –  <3.5.6
opensslopenssl*≥3.6.0  –  <3.6.2

References 8

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-032379.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • github.com https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5
    Patch
  • github.com https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616
    Patch
  • github.com https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f
    Patch
  • github.com https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a
    Patch
  • github.com https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260407.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5
    Patch
  • github.com https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616
    Patch
  • github.com https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f
    Patch
  • github.com https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a
    Patch
  • github.com https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686
    Patch