Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
2121 vulnerabilities reference this CWE, most recent first.
CVE-2026-35560 (GCVE-0-2026-35560)
Vulnerability from cvelistv5 – Published: 2026-04-03 20:10 – Updated: 2026-04-07 13:09
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 03:55 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
6 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Amazon | Amazon Athena ODBC driver |
Unaffected:
2.1.0.0
|
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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
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-07 16:19 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/bulwarkmail/webmail/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| bulwarkmail | webmail |
Affected:
< 1.4.11
|
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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
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 20:12 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/linuxdeepin/developer-center/s… | x_refsource_CONFIRM |
| https://github.com/linuxdeepin/dde-control-center… | x_refsource_MISC |
| https://github.com/linuxdeepin/dde-control-center… | x_refsource_MISC |
| https://github.com/linuxdeepin/dde-control-center… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| linuxdeepin | dde-control-center |
Affected:
>= 6.1.35, < 6.1.80
Affected: >= 5.5.3, < 5.9.9 |
|
| linuxdeepin | deepin-deepinid-plugin |
Affected:
>= 2.0.1, <= 2.0.9
|
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CVE-2026-34580 (GCVE-0-2026-34580)
Vulnerability from cvelistv5 – Published: 2026-04-07 21:12 – Updated: 2026-07-15 01:04
VLAI
EPSS
VEX
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
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 00:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/randombit/botan/security/advis… | x_refsource_CONFIRM |
| https://access.redhat.com/security/cve/CVE-2026-34580 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2456288 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| randombit | botan |
Affected:
>= 3.11.0, < 3.11.1
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
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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
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-31 13:50 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/pyca/cryptography/security/adv… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pyca | cryptography |
Affected:
< 46.0.6
|
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CVE-2026-33896 (GCVE-0-2026-33896)
Vulnerability from cvelistv5 – Published: 2026-03-27 20:50 – Updated: 2026-09-04 12:04
VLAI
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 18:53 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/digitalbazaar/forge/security/a… | x_refsource_CONFIRM |
| https://github.com/digitalbazaar/forge/commit/2e4… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-33896 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2452458 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:24761 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:34342 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:9742 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:13826 | vendor-advisoryx_refsource_REDHAT |
Impacted products
19 products
| Vendor | Product | Version | |
|---|---|---|---|
| digitalbazaar | forge |
Affected:
< 1.4.0
|
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
Unaffected:
0:2.5.20260422-3.el8ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
Unaffected:
0:2.5.20260422-3.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el9 |
|
| Red Hat | Cluster Observability Operator 1.5.0 |
Unaffected:
1782839279 , < *
(rpm)
cpe:/a:redhat:cluster_observability_operator:1.5::el9 |
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1776784286 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1777903262 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Cryostat 4 |
cpe:/a:redhat:cryostat:4
|
|
| Red Hat | Logging Subsystem for Red Hat OpenShift |
cpe:/a:redhat:logging:5
|
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
|
| Red Hat | Red Hat build of Apache Camel - HawtIO 4 |
cpe:/a:redhat:apache_camel_hawtio:4
|
|
| Red Hat | Red Hat build of Apicurio Registry 2 |
cpe:/a:redhat:service_registry:2
|
|
| Red Hat | Red Hat Build of Podman Desktop |
cpe:/a:redhat:podman_desktop:1
|
|
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat Process Automation 7 |
cpe:/a:redhat:jboss_enterprise_bpms_platform:7
|
|
| Red Hat | Red Hat Quay 3 |
cpe:/a:redhat:quay:3
|
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CVE-2026-33753 (GCVE-0-2026-33753)
Vulnerability from cvelistv5 – Published: 2026-04-08 14:54 – Updated: 2026-04-08 16:12
VLAI
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 16:08 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/trailofbits/rfc3161-client/sec… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| trailofbits | rfc3161-client |
Affected:
< 1.0.6
|
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CVE-2026-33542 (GCVE-0-2026-33542)
Vulnerability from cvelistv5 – Published: 2026-03-26 22:32 – Updated: 2026-03-30 11:47
VLAI
EPSS
VEX
Title
Incus does not verify combined fingerprint when downloading images from simplestreams servers
Summary
Incus is a system container and virtual machine manager. Prior to version 6.23.0, a lack of validation of the image fingerprint when downloading from simplestreams image servers opens the door to image cache poisoning and under very narrow circumstances exposes other tenants to running attacker controlled images rather than the expected one. Version 6.23.0 patches the issue.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 11:47 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
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CVE-2026-33308 (GCVE-0-2026-33308)
Vulnerability from cvelistv5 – Published: 2026-03-24 01:36 – Updated: 2026-03-24 13:34
VLAI
EPSS
VEX
Title
mod_gnutls missing key purpose check in client certificate verification
Summary
Mod_gnutls is a TLS module for Apache HTTPD based on GnuTLS. Prior to version 0.13.0, code for client certificate verification did not check the key purpose as set in the Extended Key Usage extension. An attacker with access to the private key for a valid certificate issued by a CA trusted for TLS client authentication but designated for a different purpose could have used that certificate to improperly access resources requiring TLS client authentication. Server configurations that do not use client certificates (`GnuTLSClientVerify ignore`, the default) are not affected. The problem has been fixed in version 0.13.0 by rewriting certificate verification to use `gnutls_certificate_verify_peers()`, and requiring key purpose id-kp-clientAuth (also known as `tls_www_client` in GnuTLS) by default if the Extended Key Usage extension is present. The new `GnuTLSClientKeyPurpose` option allows overriding the expected key purpose if needed (please see the manual for details). Behavior for certificates without an Extended Key Usage extension is unchanged. If dedicated (sub-)CAs are used for issuing TLS client certificates only (not for any other purposes) the issue has no practical impact.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-24 13:33 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/airtower-luna/mod_gnutls/secur… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| airtower-luna | mod_gnutls |
Affected:
< 0.13.0
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CVE-2026-33248 (GCVE-0-2026-33248)
Vulnerability from cvelistv5 – Published: 2026-03-25 20:18 – Updated: 2026-03-26 19:52
VLAI
EPSS
VEX
Title
NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching
Summary
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-26 19:35 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/nats-io/nats-server/security/a… | x_refsource_CONFIRM |
| https://advisories.nats.io/CVE/secnote-2026-13.txt | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nats-io | nats-server |
Affected:
< 2.11.15
Affected: >= 2.12.0-RC.1, < 2.12.6 |
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Mitigation
Architecture and Design
Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation
Implementation
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.