CWE-295

Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

CVE-2026-33753 (GCVE-0-2026-33753)

Vulnerability from cvelistv5 – Published: 2026-04-08 14:54 – Updated: 2026-04-08 16:12
VLAI
Title
Improper Certificate Validation in rfc3161-client
Summary
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any attacker to impersonate a trusted TimeStamping Authority (TSA). By exploiting a logic flaw in how the library extracts the leaf certificate from an unordered PKCS#7 bag of certificates, an attacker can append a spoofed certificate matching the target common_name and Extended Key Usage (EKU) requirements. This tricks the library into verifying these authorization rules against the forged certificate while validating the cryptographic signature against an actual trusted TSA (such as FreeTSA), thereby bypassing the intended TSA authorization pinning entirely. This vulnerability is fixed in 1.0.6.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
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CVE-2026-33896 (GCVE-0-2026-33896)

Vulnerability from cvelistv5 – Published: 2026-03-27 20:50 – Updated: 2026-03-30 18:53
VLAI
Title
Forge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violation)
Summary
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, `pki.verifyCertificateChain()` does not enforce RFC 5280 basicConstraints requirements when an intermediate certificate lacks both the `basicConstraints` and `keyUsage` extensions. This allows any leaf certificate (without these extensions) to act as a CA and sign other certificates, which node-forge will accept as valid. Version 1.4.0 patches the issue.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
digitalbazaar forge Affected: < 1.4.0
Create a notification for this product.
Show details on NVD website
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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
1.7 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
pyca cryptography Affected: < 46.0.6
Create a notification for this product.
Show details on NVD website
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CVE-2026-34580 (GCVE-0-2026-34580)

Vulnerability from cvelistv5 – Published: 2026-04-07 21:12 – Updated: 2026-04-09 03:56
VLAI
Title
Botan has a certificate authentication bypass due to trust anchor confusion
Summary
Botan is a C++ cryptography library. In 3.11.0, the function Certificate_Store::certificate_known had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of the argument. It did not check that the cert it found and the cert it was passed were actually the same certificate. In 3.11.0 an extension of path validation logic was made which assumed that certificate_known only returned true if the certificates were in fact identical. The impact is that if an end entity certificate is presented, and its DN (and subject key identifier, if set) match that of any trusted root, the end entity certificate is accepted immediately as if it itself were a trusted root. , This vulnerability is fixed in 3.11.1.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
randombit botan Affected: >= 3.11.0, < 3.11.1
Create a notification for this product.
Show details on NVD website
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CVE-2026-35207 (GCVE-0-2026-35207)

Vulnerability from cvelistv5 – Published: 2026-04-09 17:48 – Updated: 2026-04-13 20:13
VLAI
Title
deepinid plugin in dde-control-center is configured to skip TLS certificate verification when downloading avatar from remote server
Summary
dde-control-center is the control panel of DDE, the Deepin Desktop Environment. plugin-deepinid is a plugin in dde-control-center, which provides the deepinid cloud service. Prior to 6.1.80, plugin-deepinid is configured to skip TLS certificate verification when fetching the user's avatar from openapi.deepin.com or other providers. An MITM attacker could intercept the traffic, replace the avatar with a malicious or misleading image, and potentially identify the user by the avatar. This vulnerability is fixed in dde-control-center 6.1.80 and 5.9.9.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
linuxdeepin dde-control-center Affected: >= 6.1.35, < 6.1.80
Affected: >= 5.5.3, < 5.9.9
Create a notification for this product.
linuxdeepin deepin-deepinid-plugin Affected: >= 2.0.1, <= 2.0.9
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-35389 (GCVE-0-2026-35389)

Vulnerability from cvelistv5 – Published: 2026-04-06 20:11 – Updated: 2026-04-07 16:19
VLAI
Title
Bulwark Webmail S/MIME signature verification accepted self-signed certificates
Summary
Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, S/MIME signature verification did not validate the certificate trust chain (checkChain: false). Any email signed with a self-signed or untrusted certificate was displayed as having a valid signature. This vulnerability is fixed in 1.4.11.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
bulwarkmail webmail Affected: < 1.4.11
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-35560 (GCVE-0-2026-35560)

Vulnerability from cvelistv5 – Published: 2026-04-03 20:10 – Updated: 2026-04-07 13:09
VLAI
Title
Improper certificate validation in identity provider connection components in Amazon Athena ODBC driver
Summary
Improper certificate validation in the identity provider connection components in Amazon Athena ODBC driver before 2.1.0.0 might allow a man-in-the-middle threat actor to intercept authentication credentials due to insufficient default transport security when connecting to identity providers. This only applies to connections with external identity providers and does not apply to connections with Athena. To remediate this issue, users should upgrade to version 2.1.0.0.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-3822 (GCVE-0-2026-3822)

Vulnerability from cvelistv5 – Published: 2026-03-09 03:38 – Updated: 2026-03-11 06:49
VLAI
Title
Taipower｜Taipower APP(Android) - Improper Certificate Validation
Summary
Taipower APP for Andorid developed by Taipower has an Improper Certificate Validation vulnerability. When establishing an HTTPS connection with the server, the application fails to verify the server-side TLS/SSL certificate. This flaw allows an unauthenticated remote attackers to exploit the vulnerability to perform a Man-in-the-Middle (MITM) attack to read and tamper with network packets.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE
  • CWE-295 - Improper certificate validation
Assigner
References
Impacted products
Vendor Product Version
Taipower Taipower APP Affected: 0 , ≤ 3.4.4 (custom)
Create a notification for this product.
Date Public
2026-03-09 03:29
Show details on NVD website
To clipboard 

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CVE-2026-39388 (GCVE-0-2026-39388)

Vulnerability from cvelistv5 – Published: 2026-04-21 00:43 – Updated: 2026-04-21 19:36
VLAI
Title
OpenBao's Certificate Authentication Allows Token Renewal With Different Certificate
Summary
OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, OpenBao's Certificate authentication method, when a token renewal is requested and `disable_binding=true` is set, attempts to verify the current request's presented mTLS certificate matches the original. Token renewals for other authentication methods do not require any supplied login information. Due to incorrect matching, the certificate authentication method would allow renewal of tokens for which the attacker had a sibling certificate+key signed by the same CA, but which did not necessarily match the original role or the originally supplied certificate. This implies an attacker could still authenticate to OpenBao in a similar scope, however, token renewal implies that an attacker may be able to extend the lifetime of dynamic leases held by the original token. This attack requires knowledge of either the original token or its accessor. This vulnerability is original from HashiCorp Vault. This is addressed in v2.5.3. As a workaround, ensure privileged roles are tightly scoped to single certificates.
Severity
2 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
openbao openbao Affected: < 2.5.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-39984 (GCVE-0-2026-39984)

Vulnerability from cvelistv5 – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
VLAI
Title
Sigstore Timestamp Authority has Improper Certificate Validation in verifier
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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Mitigation

Phases: Architecture and Design, Implementation

Description:

  • Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation

Phase: Implementation

Description:

  • If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
CAPEC-459: Creating a Rogue Certification Authority Certificate

An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.

CAPEC-475: Signature Spoofing by Improper Validation

An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

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