CVE-2023-0464

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies() function.

OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols.

Security Fix(es):

A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification. As suddenly enabling the policy check could break existing deployments it was decided to keep the existing behavior of the X509_VERIFY_PARAM_add0_policy() function. Instead the applications that require OpenSSL to perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument. Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.(CVE-2023-0466)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

Node.js is an open-source, cross-platform, JavaScript runtime environment, it executes JavaScript code outside of a browser.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.(CVE-2023-44487)

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Initial UEFI bootloader that handles chaining to a trusted full \ bootloader under secure boot environments.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

EDK II is a modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications.

Security Fix(es):

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0464)

Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks.

Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.(CVE-2023-0465)

The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification.

As suddenly enabling the policy check could break existing deployments it was decided to keep the existing behavior of the X509_VERIFY_PARAM_add0_policy() function.

Instead the applications that require OpenSSL to perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument.

Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.(CVE-2023-0466)

Issue summary: Processing some specially crafted ASN.1 object identifiers or data containing them may be very slow.

Impact summary: Applications that use OBJ_obj2txt() directly, or use any of the OpenSSL subsystems OCSP, PKCS7/SMIME, CMS, CMP/CRMF or TS with no message size limit may experience notable to very long delays when processing those messages, which may lead to a Denial of Service.

An OBJECT IDENTIFIER is composed of a series of numbers - sub-identifiers - most of which have no size limit. OBJ_obj2txt() may be used to translate an ASN.1 OBJECT IDENTIFIER given in DER encoding form (using the OpenSSL type ASN1_OBJECT) to its canonical numeric text form, which are the sub-identifiers of the OBJECT IDENTIFIER in decimal form, separated by periods.

When one of the sub-identifiers in the OBJECT IDENTIFIER is very large (these are sizes that are seen as absurdly large, taking up tens or hundreds of KiBs), the translation to a decimal number in text may take a very long time. The time complexity is O(n^2) with 'n' being the size of the sub-identifiers in bytes (*).

With OpenSSL 3.0, support to fetch cryptographic algorithms using names / identifiers in string form was introduced. This includes using OBJECT IDENTIFIERs in canonical numeric text form as identifiers for fetching algorithms.

Such OBJECT IDENTIFIERs may be received through the ASN.1 structure AlgorithmIdentifier, which is commonly used in multiple protocols to specify what cryptographic algorithm should be used to sign or verify, encrypt or decrypt, or digest passed data.

Applications that call OBJ_obj2txt() directly with untrusted data are affected, with any version of OpenSSL.…

A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the X509_VERIFY_PARAM_set1_policies()' function.

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

• openssl: Possible DoS translating ASN.1 object identifiers (CVE-2023-2650)
• openssl: Denial of service by excessive resource usage in verifying X509 policy constraints (CVE-2023-0464)
• openssl: Invalid certificate policies in leaf certificates are silently ignored (CVE-2023-0465)
• openssl: Certificate policy check not enabled (CVE-2023-0466)
• openssl: Input buffer over-read in AES-XTS implementation on 64 bit ARM (CVE-2023-1255)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• In FIPS mode, openssl KDFs should only allow selected hash algorithms (BZ#2175860)
• In FIPS mode, openssl should reject short KDF input or output keys or provide an indicator (BZ#2175864)
• In FIPS mode, openssl should provide an indicator for AES-GCM to query whether the IV was generated internally or provided externally (BZ#2175868)
• openssl FIPS mode self-test should zeroize out in verify_integrity in providers/fips/self_test.c (BZ#2175873)
• In FIPS mode, openssl should not support RSA encryption or decryption without padding (outside of RSASVE) or provide an indicator (BZ#2178029)
• In FIPS mode, openssl should reject EVP_PKEY_fromdata() for short DHX keys, or provide an indicator (BZ#2178030)
• In FIPS mode, openssl should not use the legacy ECDSA_do_sign(), RSA_public_encrypt(), RSA_private_decrypt() functions for pairwise consistency tests (BZ#2178034)
• In FIPS mode, openssl should enter error state when DH PCT fails (BZ#2178039)
• In FIPS mode, openssl should always run the PBKDF2 lower bounds checks or provide an indicator when the pkcs5 parameter is set to 1 (BZ#2178137)
• Support requiring EMS in TLS 1.2, default to it when in FIPS mode (BZ#2188046)
• OpenSSL rsa_verify_recover doesn't use the same key checks as rsa_verify in FIPS mode (BZ#2188052)
• AlmaLinux9.0 - sshd dumps core when ibmca engine is configured with default_algorithms = CIPHERS or ALL (openssl) (BZ#2211396)

• CVE-2023-0464: Fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: Fix documentation of X509_VERIFY_PARAM_add0_policy()
• CVE-2022-3996: Drop redundant flag setting in policy_cache_set_mapping()

• CVE-2023-0464: Fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: Fix documentation of X509_VERIFY_PARAM_add0_policy()
• CVE-2022-3996: Drop redundant flag setting in policy_cache_set_mapping()

• CVE-2023-0464: Fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: Fix documentation of X509_VERIFY_PARAM_add0_policy()
• CVE-2022-3996: Drop redundant flag setting in policy_cache_set_mapping()

• SECURITY UPDATE: Excessive resource use verifying X.509 policy constraints
  • debian/patches/CVE-2023-0464.patch: Limit X.509 certificate tree size to avoid exponential use of computational resources
  • CVE-2023-0464
• SECURITY UPDATE: Incorrecly documented X509_VERIFY_PARAM_add0_policy()
  • debian/patches/CVE-2023-0466.patch: Align documentation with actual implementation
  • CVE-2023-0466
• SECURITY UPDATE: Double locking in X.509 policy cache handling
  • debian/patches/CVE-2022-3996.patch: Revert previously introduced redundant flag setting and so avoid locking at all
  • CVE-2022-3996

• CVE-2023-0464: Fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: Fix documentation of X509_VERIFY_PARAM_add0_policy()
• CVE-2022-3996: Drop redundant flag setting in policy_cache_set_mapping()

• CVE-2023-0215: bio_ndef: fix a UAF resulting from a bug in BIO_new_NDEF
• CVE-2023-0464: x509v3: Limit X.509 certificate tree size to avoid exponential use of computational resources

• CVE-2023-0464: fix excessive resource use when verifying X.509 policy constraints

• CVE-2021-3711: fix SM2 decryption buffer overflow; check the plaintext buffer is large enough when decrypting SM2; add extended tests for SM2
• CVE-2022-3996: fix X.509 policy constraints double-locking denial of service
• CVE-2023-0464: fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: fix X509_VERIFY_PARAM_add0_policy() does not enable policy check
• CVE-2023-2650: restrict the size of OBJECT IDENTIFIERs that OBJ_obj2txt translates
• CVE-2024-13176: fix timing side-channel in ECDSA signature computation
• CVE-2024-5535: validate provided client list in SSL_select_next_proto
• CVE-2025-9230: fix out-of-bounds read and write in RFC 3211 KEK unwrap
• CVE-2025-69419: fix one-byte write-before-buffer in PKCS#12 BMPString conversion
• CVE-2025-69421: fix NULL dereference in PKCS12_item_decrypt_d2i_ex()
• CVE-2026-28387: fix use-after-free / double-free in dane_match()
• CVE-2026-28388: fix NULL dereference in check_delta_base()
• CVE-2026-28389: fix NULL dereference in dh/ecdh_cms_set_shared_info()
• CVE-2026-28390: fix NULL dereference in rsa_cms_decrypt()

• CVE-2021-3711: fix SM2 decryption buffer overflow; check the plaintext buffer is large enough when decrypting SM2; add extended tests for SM2
• CVE-2022-3996: fix X.509 policy constraints double-locking denial of service
• CVE-2023-0464: fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: fix X509_VERIFY_PARAM_add0_policy() does not enable policy check
• CVE-2023-2650: restrict the size of OBJECT IDENTIFIERs that OBJ_obj2txt translates
• CVE-2024-13176: fix timing side-channel in ECDSA signature computation
• CVE-2024-5535: validate provided client list in SSL_select_next_proto
• CVE-2025-9230: fix out-of-bounds read and write in RFC 3211 KEK unwrap
• CVE-2025-69419: fix one-byte write-before-buffer in PKCS#12 BMPString conversion
• CVE-2025-69421: fix NULL dereference in PKCS12_item_decrypt_d2i_ex()
• CVE-2026-28387: fix use-after-free / double-free in dane_match()
• CVE-2026-28388: fix NULL dereference in check_delta_base()
• CVE-2026-28389: fix NULL dereference in dh/ecdh_cms_set_shared_info()
• CVE-2026-28390: fix NULL dereference in rsa_cms_decrypt()

• CVE-2021-3711: fix SM2 decryption buffer overflow; check the plaintext buffer is large enough when decrypting SM2; add extended tests for SM2
• CVE-2022-3996: fix X.509 policy constraints double-locking denial of service
• CVE-2023-0464: fix excessive resource use verifying X.509 policy constraints
• CVE-2023-0466: fix X509_VERIFY_PARAM_add0_policy() does not enable policy check
• CVE-2023-2650: restrict the size of OBJECT IDENTIFIERs that OBJ_obj2txt translates
• CVE-2024-13176: fix timing side-channel in ECDSA signature computation
• CVE-2024-5535: validate provided client list in SSL_select_next_proto
• CVE-2025-9230: fix out-of-bounds read and write in RFC 3211 KEK unwrap
• CVE-2025-69419: fix one-byte write-before-buffer in PKCS#12 BMPString conversion
• CVE-2025-69421: fix NULL dereference in PKCS12_item_decrypt_d2i_ex()
• CVE-2026-28387: fix use-after-free / double-free in dane_match()
• CVE-2026-28388: fix NULL dereference in check_delta_base()
• CVE-2026-28389: fix NULL dereference in dh/ecdh_cms_set_shared_info()
• CVE-2026-28390: fix NULL dereference in rsa_cms_decrypt()

A read buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed the malicious certificate or for the application to continue certificate verification despite failure to construct a path to a trusted issuer. The read buffer overrun might result in a crash which could lead to a denial of service attack. In theory it could also result in the disclosure of private memory contents (such as private keys, or sensitive plaintext) although we are not aware of any working exploit leading to memory contents disclosure as of the time of release of this advisory. In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects. (CVE-2022-4203)

A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE. For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection. (CVE-2022-4304)

The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue. (CVE-2022-4450)

The public API function BIO_new_NDEF is a helper function used for streaming ASN.1 data via a BIO. It is primarily used internally to OpenSSL to support the SMIME, CMS and PKCS7 streaming capabilities, but may also be called directly by end user applications. The function receives a BIO from the caller, prepends a new BIO_f_asn1 filter BIO onto the front of it to form a BIO chain, and then returns the new head of the BIO chain to the caller. Under certain conditions, for example if a CMS recipient public key is invalid, the new filter BIO is freed and the function returns a NULL result indicating a failure.…

These are all security issues fixed in the libopenssl-1_0_0-devel-1.0.2u-14.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libopenssl-1_1-devel-1.1.1t-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libopenssl-3-devel-3.1.1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the python311-pymssql-2.3.12-1.1 package on the GA media of openSUSE Tumbleweed.

This update for openssl-1_0_0 fixes the following issues:

Security fixes:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).

Other fixes:

• Fix DH key generation in FIPS mode, add support for constant BN for DH parameters (bsc#1202062)

This update for openssl-1_0_0 fixes the following issues:

Security fixes:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).

Other fixes:

• Fix DH key generation in FIPS mode, add support for constant BN for DH parameters (bsc#1202062)

This update for compat-openssl098 fixes the following issues:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).

This update for openssl fixes the following issues:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).

This update for openssl-1_1 fixes the following issues:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).

This update for openssl-3 fixes the following issues:

• CVE-2023-0464: Fixed excessive Resource Usage Verifying X.509 Policy Constraints (bsc#1209624).