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7 vulnerabilities by pyca
CVE-2026-34073 (GCVE-0-2026-34073)
Vulnerability from cvelistv5 – Published: 2026-03-31 02:04 – Updated: 2026-03-31 13:52
VLAI?
Title
cryptography has incomplete DNS name constraint enforcement on peer names
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.
Severity ?
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pyca | cryptography |
Affected:
< 46.0.6
|
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CVE-2026-27459 (GCVE-0-2026-27459)
Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-03-18 19:52
VLAI?
Title
pyOpenSSL DTLS cookie callback buffer overflow
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.
Severity ?
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2026-27448 (GCVE-0-2026-27448)
Vulnerability from cvelistv5 – Published: 2026-03-17 23:24 – Updated: 2026-03-18 20:18
VLAI?
Title
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
Severity ?
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2026-26007 (GCVE-0-2026-26007)
Vulnerability from cvelistv5 – Published: 2026-02-10 21:42 – Updated: 2026-02-11 21:28
VLAI?
Title
cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() and load_pem_public_key() functions do not verify that the point belongs to the expected prime-order subgroup of the curve. This missing validation allows an attacker to provide a public key point P from a small-order subgroup. This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victim_private_key]P via ECDH, this leaks information about victim_private_key mod (small_subgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup. Only SECT curves are impacted by this. This vulnerability is fixed in 46.0.5.
Severity ?
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pyca | cryptography |
Affected:
< 46.0.5
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CVE-2024-26130 (GCVE-0-2024-26130)
Vulnerability from cvelistv5 – Published: 2024-02-21 16:28 – Updated: 2024-08-14 20:01
VLAI?
Title
cryptography NULL pointer deference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Starting in version 38.0.0 and prior to version 42.0.4, if `pkcs12.serialize_key_and_certificates` is called with both a certificate whose public key did not match the provided private key and an `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)`, then a NULL pointer dereference would occur, crashing the Python process. This has been resolved in version 42.0.4, the first version in which a `ValueError` is properly raised.
Severity ?
7.5 (High)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pyca | cryptography |
Affected:
>= 38.0.0, < 42.0.4
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CVE-2023-49083 (GCVE-0-2023-49083)
Vulnerability from cvelistv5 – Published: 2023-11-29 18:50 – Updated: 2025-12-18 15:32
VLAI?
Title
cryptography vulnerable to NULL-dereference when loading PKCS7 certificates
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.
Severity ?
5.9 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pyca | cryptography |
Affected:
>= 3.1, < 41.0.6
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CVE-2023-23931 (GCVE-0-2023-23931)
Vulnerability from cvelistv5 – Published: 2023-02-07 20:54 – Updated: 2025-11-03 21:47
VLAI?
Title
Cipher.update_into can corrupt memory in pyca cryptography
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.
Severity ?
4.8 (Medium)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pyca | cryptography |
Affected:
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