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OpenSSL CVE-2026-22796

MEDIUM
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-01-27 openssl-security@openssl.org
OpenSSL Denial Of Service
5.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SUSE
MEDIUM
qualitative
Red Hat
5.9 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
Patch released
Feb 02, 2026 - 18:40 nvd
Patch available
CVE Published
Jan 27, 2026 - 16:16 nvd
MEDIUM 5.3

DescriptionCVE.org

Issue summary: A type confusion vulnerability exists in the signature verification of signed PKCS#7 data where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing malformed PKCS#7 data.

Impact summary: An application performing signature verification of PKCS#7 data or calling directly the PKCS7_digest_from_attributes() function can be caused to dereference an invalid or NULL pointer when reading, resulting in a Denial of Service.

The function PKCS7_digest_from_attributes() accesses the message digest attribute value without validating its type. When the type is not V_ASN1_OCTET_STRING, this results in accessing invalid memory through the ASN1_TYPE union, causing a crash.

Exploiting this vulnerability requires an attacker to provide a malformed signed PKCS#7 to an application that verifies it. The impact of the exploit is just a Denial of Service, the PKCS7 API is legacy and applications should be using the CMS API instead. For these reasons the issue was assessed as Low severity.

The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the PKCS#7 parsing implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.

AnalysisAI

OpenSSL's PKCS#7 signature verification fails to validate ASN1_TYPE union members before access, allowing attackers to trigger null pointer dereference crashes by submitting malformed PKCS#7 data. Applications performing signature verification or using PKCS7_digest_from_attributes() directly are vulnerable to denial of service attacks. A patch is available to address this type confusion vulnerability.

Technical ContextAI

Classified as CWE-754 (Improper Check for Unusual or Exceptional Conditions). Affects the a Denial of component of Openssl. Issue summary: A type confusion vulnerability exists in the signature verification of signed PKCS#7 data where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing malformed PKCS#7 data.

Impact summary: An application performing signature verification of PKCS#7 data or calling directly the PKCS7_digest_from_attributes() function can be caused to dereference an invalid or NULL pointer when reading, resulting in a

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container private-registry/harbor-portal:1.1.1-1.16 Container suse/multi-linux-manager/5.1/x86_64/server-postgresql:5.1.2.6.13.1 Image server-postgresql-image Affected
Container suse/ltss/sle12.5/sles12sp5:8.5.188 Image SLES12-SP5-EC2-ECS-On-Demand Image SLES12-SP5-EC2-On-Demand Affected
Container suse/manager/4.3/proxy-httpd:4.3.16.2.9.73.10 Container suse/manager/4.3/proxy-squid:4.3.16.2.9.72.8 Container suse/manager/4.3/proxy-ssh:4.3.16.2.9.63.8 Affected
Container suse/manager/4.3/proxy-salt-broker:4.3.16.2.9.63.10 Container suse/manager/4.3/proxy-tftpd:4.3.16.2.9.63.9 Affected
Container suse/manager/5.0/x86_64/proxy-httpd:latest Container suse/manager/5.0/x86_64/proxy-ssh:latest Container suse/manager/5.0/x86_64/server-migration-14-16:latest Affected

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CVE-2026-22796 vulnerability details – vuln.today
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