CVE-2026-75805

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Source
https://cve.org/CVERecord?id=CVE-2026-75805
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75805.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-75805
Downstream
ALPINE (1)
AZL (9)
BELL (1)
CGA (8)
CLEANSTART (1)
DEBIAN (1)
ECHO (1)
MGASA (1)
MINI (1)
openSUSE (1)
RHSA (2)
SUSE (7)
UBUNTU (1)
Related
openSUSE (1)
SUSE (7)
Published
2026-09-29T15:32:20Z
Modified
2026-10-21T17:42:30Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
NULL Pointer Dereference in CMP Client Revocation Response Handling
Details

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response.

Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application.

CWE: CWE-476: NULL-pointer dereference

Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API.

A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash.

The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected.

FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

Database specific 
{
    "cna_assigner":  "openssl",
    "cwe_ids":  [
        "CWE-476"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75805.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "3.0.0"
                        },
                        {
                            "fixed":  "3.0.23"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type
GIT
Repo
https://github.com/openssl/openssl
Events
Introduced
98acb6b02839c609ef5b837794e08d906d965335
Fixed
e72c946f6f6d94c8ba5119acb25340b7b6b2073f
Introduced
636dfadc70ce26f2473870570bfd9ec352806b1d
Fixed
45e844fa2a14ec92d146bd8f5778ac130b6625fb
Introduced
7b371d80d959ec9ab4139d09d78e83c090de9779
Fixed
c8bd5a57108599ac650bbae77fcabe3109dab2e8
Introduced
11b7b6ea3b65a584e1d31408ed1bdb139465cffd
Fixed
af1775b60dfa141a4ad762585052cabeb9f37e9e
Fixed
7588db7fef14209c3caa3a101d11a02006b19166
Fixed
7ca0ccb5172a577e9b87267d77bfe21e5481a5e7
Fixed
9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3
Fixed
abf02872a4b71767ecc72293424420f5b009190f
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.4.0"
                },
                {
                    "fixed":  "3.4.8"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.5.0"
                },
                {
                    "fixed":  "3.5.9"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.6.0"
                },
                {
                    "fixed":  "3.6.5"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.3"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "7588db7fef14209c3caa3a101d11a02006b19166"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "abf02872a4b71767ecc72293424420f5b009190f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

3.*
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
openssl-3.*
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.4.6
openssl-3.4.7
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.5.7
openssl-3.5.8
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-3.6.3
openssl-3.6.4
openssl-4.*
openssl-4.0.0
openssl-4.0.1
openssl-4.0.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75805.json"
vanir_signatures 
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        "source":  "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7",
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]
vanir_signatures_modified 
"2026-10-21T10:42:51Z"