openssl, openssl3 — security advisory
There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.
- Products
- openssl, openssl3
- Affected versions
- Not specified
- Fixed versions
- 1.1.1t-r0, 3.0.8-r0
- CVEs
- CVE-2023-0286
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 14:53 UTC · Revision 1
Source evidence
There is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. X.400 addresses were parsed as an ASN1_STRING but the public structure definition for GENERAL_NAME incorrectly specified the type of the x400Address field as ASN1_TYPE. This field is subsequently interpreted by the OpenSSL function GENERAL_NAME_cmp as an ASN1_TYPE rather than an ASN1_STRING. When CRL checking is enabled (i.e. the application sets the X509_V_FLAG_CRL_CHECK flag), this vulnerability may allow an attacker to pass arbitrary pointers to a memcmp call, enabling them to read memory contents or enact a denial of service. In most cases, the attack requires the attacker to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one of these inputs, the other input must already contain an X.400 address as a CRL distribution point, which is uncommon. As such, this vulnerability is most likely to only affect applications which have implemented their own functionality for retrieving CRLs over a network.
osv:ALPINE-CVE-2023-0286
openssl
Fixed versions: 1.1.1t-r0
openssl
Fixed versions: 1.1.1t-r0
openssl
Fixed versions: 1.1.1t-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl
Fixed versions: 3.0.8-r0
openssl3
Fixed versions: 3.0.8-r0
openssl3
Fixed versions: 3.0.8-r0
Complete source record
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"modified": "2026-10-26T17:17:58.599647919Z",
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