NULL Pointer Dereference in CRMF EncryptedValue Decryption

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Summary

CVECVE-2026-42767
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 17:17:08 UTC
Updated2026-06-16 02:58:39 UTC
DescriptionIssue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003440000 probability, percentile 0.260440000 (date 2026-06-16)

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openssl Openssl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected 4.0.0 4.0.1 semver Not specified
CNA OpenSSL OpenSSL affected 3.6.0 3.6.3 semver Not specified
CNA OpenSSL OpenSSL affected 3.5.0 3.5.7 semver Not specified
CNA OpenSSL OpenSSL affected 3.4.0 3.4.6 semver Not specified
CNA OpenSSL OpenSSL affected 3.0.0 3.0.21 semver Not specified

References

ReferenceSourceLinkTags
github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774 [email protected] github.com Patch
github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 [email protected] github.com Patch
github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 [email protected] github.com Patch
openssl-library.org/news/secadv/20260609.txt [email protected] openssl-library.org Vendor Advisory
github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d [email protected] github.com Patch
github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f [email protected] github.com Patch
github.com/openssl/security/commit/61a86a8cd73546c9fea916f3d304c1293e05c046 MITRE github.com
github.com/openssl/security/commit/665d5254083affde9982efca7c41dd01cacc8774 MITRE github.com
github.com/openssl/security/commit/810b722f772652ad48042bcc7ab07e3414b11d0f MITRE github.com
github.com/openssl/security/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873 MITRE github.com
github.com/openssl/security/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zhanpeng Liu (Tencent Xuanwu Lab) (en)

CNA: Guannan Wang (Tencent Xuanwu Lab) (en)

CNA: Guancheng Li (Tencent Xuanwu Lab) (en)

CNA: Bhabani Sankar Das (en)

CNA: Igor Ustinov (en)

CNA: Tomáš Mráz (en)

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