7.5

CVE-2026-28389

Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
OpenSSL ≫ OpenSSL Version >= 1.0.2 < 1.0.2zp
OpenSSL ≫ OpenSSL Version >= 1.1.1 < 1.1.1zg
OpenSSL ≫ OpenSSL Version >= 3.0.0 < 3.0.20
OpenSSL ≫ OpenSSL Version >= 3.3.0 < 3.3.7
OpenSSL ≫ OpenSSL Version >= 3.4.0 < 3.4.5
OpenSSL ≫ OpenSSL Version >= 3.5.0 < 3.5.6
OpenSSL ≫ OpenSSL Version >= 3.6.0 < 3.6.2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.81% 0.519
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

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