Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
2225 vulnerabilities reference this CWE, most recent first.
CVE-2026-97687 (GCVE-0-2026-97687)
Vulnerability from cvelistv5 – Published: 2026-09-29 15:30 – Updated: 2026-09-30 20:11
VLAI
EPSS
VEX
Title
urllib3: HTTPS proxy TLS configuration may be ignored or overridden
Summary
urllib3 is an HTTP client library for Python. From 1.26.0 until 2.8.0, the proxy_ssl_context, proxy_assert_hostname, proxy_assert_fingerprint, ssl_context, cert_reqs, verify_mode, use_forwarding_for_https=True, and CERT_NONE configuration paths fail to remain separated because target-server TLS settings are incorrectly applied to the HTTPS proxy connection. The trigger is that an application uses an HTTPS proxy and configures target-server TLS settings that must remain separate from the proxy TLS handshake, including HTTPS forwarding with target-specific identity or credentials. Applying cert_reqs=CERT_NONE can overwrite proxy_ssl_context.verify_mode in place, and the mutation persists so later connections reusing the same context may connect to the HTTPS proxy without certificate verification. The attack mechanism is that an attacker intercepts and impersonates the HTTPS proxy after the effective proxy policy accepts the attacker's certificate. The impact is that the attacker can observe or modify forwarded traffic or receive a target TLS client certificate, while CONNECT tunneling still preserves the separate end-to-end target TLS connection. This issue is fixed in version 2.8.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:48 UTC
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/urllib3/urllib3/security/advis… | x_refsource_CONFIRM |
| https://github.com/urllib3/urllib3/pull/5093 | x_refsource_MISC |
| https://github.com/urllib3/urllib3/commit/07408ce… | x_refsource_MISC |
| https://github.com/urllib3/urllib3/commit/b644729… | x_refsource_MISC |
| https://github.com/urllib3/urllib3/releases/tag/2.8.0 | x_refsource_MISC |
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CVE-2026-93601 (GCVE-0-2026-93601)
Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-09-18 17:49
VLAI
EPSS
VEX
Title
rustls webpki 0.101.0 before 0.103.12 Name Constraint Bypass
Summary
rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:49 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/rustls/webpki/security/advisor… | vendor-advisory |
| https://www.vulncheck.com/advisories/rustls-webpk… | third-party-advisory |
Impacted products
Date Public
2026-04-15 00:00
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CVE-2026-93600 (GCVE-0-2026-93600)
Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-09-21 20:51
VLAI
EPSS
VEX
Title
rustls webpki Name Constraints URI Validation Bypass
Summary
rustls-webpki (rustls/webpki) versions 0.101.0 through 0.103.11 and 0.104.0-alpha releases before 0.104.0-alpha.6 ignore X.509 name constraints that apply to URI names, causing such constraints to be accepted rather than enforced. Because name constraints are restrictions on otherwise properly issued certificates, the flaw is only reachable after successful signature verification and requires a misissued certificate to exploit; the library also provides no API for asserting URI names, and URI name constraints are otherwise unimplemented. Versions 0.103.12 and 0.104.0-alpha.6 reject URI name constraints unconditionally.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 16:22 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/rustls/webpki/security/advisor… | vendor-advisory |
| https://www.vulncheck.com/advisories/rustls-webpk… | third-party-advisory |
Impacted products
Date Public
2026-04-15 00:00
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CVE-2026-93302 (GCVE-0-2026-93302)
Vulnerability from cvelistv5 – Published: 2026-09-27 09:07 – Updated: 2026-09-29 16:41
VLAI
EPSS
VEX
Title
Trusted peer certificate match ignores public key, allowing forged CA clones
Summary
MatchTrustedPeer ignores the public key used, leading to forged CA clones passing verification. Affected builds are any that enable the macro WOLFSSL_TRUST_PEER_CERT and load CA certificates with wolfSSL_CTX_trust_peer_cert() or wolfSSL_trust_peer_cert(). The peer must know the certificates being loaded to either of those APIs to take advantage of the issue. When OPENSSL_COMPATIBLE_DEFAULTS is also defined this widens the affected API to include all CA certificate loading. Both macros are defined when using autoconf builds such as (nginx, haproxy, stunnel, wpas, apache httpd, hitch, bind, rsyslog, ffmpeg, all, distro). When the certificate is listed as a trusted peer certificate the issue previously allowed for a malicious (D)TLS server to bypass authentication once knowing which CA’s the client would accept. This also affects mutual authentication cases where the client knows which CA’s the server has loaded. If building with any of these configurations and using (D)TLS where the loaded CA’s could be known and authentication of the peer is desired, users should either: update to the latest wolfSSL version, apply the fix patch, or use the configure flag --disable-openssl-compatible-defaults and not load CA’s with wolfSSL_CTX_trust_peer_cert() or wolfSSL_trust_peer_cert() to mitigate the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 16:40 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
Date Public
2026-09-26 12:00
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CVE-2026-93291 (GCVE-0-2026-93291)
Vulnerability from cvelistv5 – Published: 2026-09-24 19:27 – Updated: 2026-09-24 19:33
VLAI
EPSS
VEX
Title
Improper certificate validation in Eufy Omni C20
Summary
Omni C20 lacks proper certificate validation which could allow an attacker to perform a man-in-the-middle attack which could allow them to execute arbitrary code.
Severity
9.4 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 19:33 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
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CVE-2026-92868 (GCVE-0-2026-92868)
Vulnerability from cvelistv5 – Published: 2026-09-30 07:20 – Updated: 2026-09-30 19:40
VLAI
EPSS
VEX
Summary
An improper certificate validation vulnerability exists in Pgpool-II, which may allow an unauthenticated attacker to bypass client certificate authentication.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:40 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Pgpool Global Development Group | Pgpool-II |
Affected:
4.7.0 , ≤ 4.7.2
(semver)
Affected: 4.6.0 , ≤ 4.6.7 (semver) Affected: 4.5.0 , ≤ 4.5.12 (semver) Affected: 4.4.0 , ≤ 4.4.17 (semver) Affected: 4.3.0 , ≤ 4.3.20 (semver) Affected: 4.0.x , ≤ 4.2.x (semver) |
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CVE-2026-91812 (GCVE-0-2026-91812)
Vulnerability from cvelistv5 – Published: 2026-09-23 07:49 – Updated: 2026-09-23 14:39
VLAI
EPSS
VEX
Title
Foxit PDF Editor/Reader FoxitUpdater Improper Certificate Validation Local Privilege Escalation Vulnerability
Summary
A vulnerability in Foxit PDF Editor/Reader’s update mechanism allows man-in-the-middle attackers to bypass certificate validation and package integrity checks, potentially enabling arbitrary code execution with system privileges.
Severity
7.9 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 14:39 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Foxit Software Inc. | Foxit PDF Editor |
Affected:
Versions 2026.2 and earlier
Affected: Versions 14.0.7 and earlier Affected: Versions 13.2.6 and earlier |
|
| Foxit Software Inc. | Foxit PDF Reader |
Affected:
Versions 2026.2 and earlier
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CVE-2026-90651 (GCVE-0-2026-90651)
Vulnerability from cvelistv5 – Published: 2026-09-12 23:55 – Updated: 2026-09-14 18:15
VLAI
EPSS
VEX
Summary
Socket Firewall (socketdev/socket-registry-firewall) in registry mode before 2.0.0 does not verify upstream TLS certificates by default. When the api_ssl_verify and upstream_ssl_verify configuration keys are omitted from socket.yml, the generated configuration sets SOCKET_API_SSL_VERIFY='false' and UPSTREAM_SSL_VERIFY='false', and the OpenResty/Lua HTTP client used for outbound requests accepts any certificate, including self-signed and otherwise untrusted certificates, without validating the chain. An attacker positioned to intercept traffic between Socket Firewall and the Socket API or an upstream package registry can present a crafted certificate and modify responses in transit, including substituting malicious package content or altering the allow/block decisions the firewall enforces. Setting api_ssl_verify: true and upstream_ssl_verify: true enables verification; however, in versions before 1.1.334, the generated nginx configuration did not emit lua_ssl_trusted_certificate, and thus verification could not be used successfully without manually patching the generated configuration. Version 2.0.0 changes the default for both settings to true.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 14:56 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Socket | Socket Firewall |
Affected:
0 , < 2.0.0
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CVE-2026-90647 (GCVE-0-2026-90647)
Vulnerability from cvelistv5 – Published: 2026-09-12 22:38 – Updated: 2026-09-15 17:10
VLAI
EPSS
VEX
Summary
ASE/Kalkitech ASE2000 V2 Communication Test Set 2.35 through 2.37 on Windows contains an improper certificate validation vulnerability in the IEC 60870-5-104 TLS client (Task Mode). This allows a network-positioned attacker to bypass certificate validation via a certificate with multiple simultaneous faults, enabling a Man-in-the-Middle attack on protected communications.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 17:09 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ase-systems.com/wp-content/uploads/20… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kalkitech | ASE2000 V2 Communication Test Set |
Affected:
2.35 , < 2.38
(custom)
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CVE-2026-90623 (GCVE-0-2026-90623)
Vulnerability from cvelistv5 – Published: 2026-09-14 03:45 – Updated: 2026-09-14 15:48
VLAI
EPSS
VEX
Title
andreashappe cochise SSH Host Key ssh_connection.py asyncssh.connect certificate validation
Summary
A weakness has been identified in andreashappe cochise up to 0.4.1. Affected is the function asyncssh.connect of the file src/cochise/ssh_connection.py of the component SSH Host Key Handler. Executing a manipulation can lead to improper certificate validation. The attack may be launched remotely. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 15:48 UTC
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/403205 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/403205/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-90623 | third-party-advisory |
| https://vuldb.com/submit/914815 | third-party-advisory |
| https://github.com/andreashappe/cochise/issues/13 | exploitissue-tracking |
| https://github.com/andreashappe/cochise/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| andreashappe | cochise |
Affected:
0.4.0
Affected: 0.4.1 cpe:2.3:a:andreashappe:cochise:*:*:*:*:*:*:*:* |
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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.