Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
2221 vulnerabilities reference this CWE, most recent first.
CVE-2026-85525 (GCVE-0-2026-85525)
Vulnerability from cvelistv5 – Published: 2026-09-04 08:22 – Updated: 2026-09-10 15:44
VLAI
EPSS
VEX
Title
Improper OCSP response validation in Snowflake drivers
Summary
Improper OCSP response validation in the Snowflake Python, Go, JDBC, and Node.js drivers allowed a revoked TLS certificate to be accepted as valid, because OCSP responses were not reliably bound to the certificate being validated and definitive verification failures were treated as transient. A man-in-the-middle attacker holding a revoked certificate and its private key for a Snowflake or stage hostname could cause the driver to establish a TLS session to the attacker-controlled endpoint anyway, allowing the attacker to read and modify data transmitted within that connection. Successful exploitation requires that on-path position and the corresponding private key, and impact is limited to data carried within the intercepted connection. The fix is available in Snowflake Connector for Python v4.7.3, Snowflake Go Driver v2.2.0, Snowflake JDBC Driver v4.3.4 (including the snowflake-jdbc-fips and snowflake-jdbc-thin), and Snowflake Node.js Driver v3.3.0. Users must manually upgrade.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:40 UTC
CWE
References
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| Snowflake | Snowflake Connector for Python |
Affected:
0 , < 4.7.3
(python)
|
|
| Snowflake | Snowflake Go Driver |
Affected:
0 , ≤ 1.19.1
(semver)
|
|
| Snowflake | Snowflake Go Driver |
Affected:
2.0.0 , < 2.2.0
(semver)
|
|
| Snowflake | Snowflake JDBC Driver |
Affected:
0 , < 4.3.4
(maven)
|
|
| Snowflake | Snowflake JDBC Driver (FIPS) |
Affected:
0 , < 4.3.4
(maven)
|
|
| Snowflake | Snowflake JDBC Driver (Thin) |
Affected:
0 , < 4.3.4
(maven)
|
|
| Snowflake | Snowflake Node.js Driver |
Affected:
0 , < 3.3.0
(semver)
|
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CVE-2026-85221 (GCVE-0-2026-85221)
Vulnerability from cvelistv5 – Published: 2026-09-03 14:16 – Updated: 2026-09-03 14:22
VLAI
EPSS
VEX
Title
MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attacks
Summary
MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it.
As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certificate authority. An attacker capable of intercepting or manipulating network traffic between a MISP instance and a remote HTTPS service could impersonate the remote endpoint and perform a man-in-the-middle attack.
Successful exploitation could allow an attacker to observe sensitive information transmitted by MISP, including authentication material or exchanged threat intelligence, and to modify responses returned to the MISP instance. The impact depends on the functionality using CurlClient and the data exchanged with the remote service.
The patch enables TLS peer verification by default while preserving explicit support for configured self-signed certificates. It also corrects the self-signed certificate handling in SyncTool so that peer verification is disabled only when no pinned CA certificate is configured.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 14:22 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/e06f69858 | patch |
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CVE-2026-85102 (GCVE-0-2026-85102)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:00 – Updated: 2026-09-23 03:55
VLAI
EPSS
VEX
Title
Improper Certificate Validation in Quantum Security Gateway
Summary
Improper certificate trust validation during VPN negotiation in Check Point Quantum Security Gateway may allow an unauthenticated remote attacker to execute arbitrary code on the Gateway.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
- CWE-295 - Improper Certificate Validation.
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://support.checkpoint.com/results/sk/sk1000117 | |
| https://blog.checkpoint.com/security/security-adv… | vendor-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| checkpoint | Quantum Security Gateway |
Affected:
R82.10 with Jumbo Hotfix Take 43 or below
Affected: R82 with Jumbo Hotfix Take 125 or below Affected: R81.20 with Jumbo Hotfix Take 165 or below |
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CVE-2026-84975 (GCVE-0-2026-84975)
Vulnerability from cvelistv5 – Published: 2026-09-18 17:08 – Updated: 2026-09-24 21:05
VLAI
EPSS
VEX
Title
PJSIP: TLS server identity (hostname) verification bypass via embedded NUL in certificate SubjectAltName (OpenSSL and GnuTLS backends)
Summary
PJSIP is a free and open source multimedia communication library written in C. In 2.17 and earlier, the OpenSSL and GnuTLS backends in pjlib/src/pj/ssl_sock_ossl.c and pjlib/src/pj/ssl_sock_gtls.c copy DNS SubjectAltName values with string functions that recalculate their length and truncate an embedded NUL byte. With server verification enabled through --tls-verify-server for the PJSIP TLS/SIPS transport, a certificate containing a DNS SubjectAltName formed from the target hostname prefix followed by an embedded NUL and an attacker-controlled suffix can therefore be accepted for the prefix hostname. An attacker who possesses such a certificate from a trusted issuer and can intercept the connection can impersonate the target server, complete the SIP session, and receive REGISTER credentials. The mbedTLS backend is not affected because it preserves the explicit string length. No fixed version is available as of this review.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 21:00 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/pjsip/pjproject/security/advis… | x_refsource_CONFIRM |
| https://github.com/pjsip/pjproject/commit/43d3bd7… | x_refsource_MISC |
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CVE-2026-84961 (GCVE-0-2026-84961)
Vulnerability from cvelistv5 – Published: 2026-09-04 16:47 – Updated: 2026-09-04 18:37
VLAI
EPSS
VEX
Title
undici vulnerable to TLS certificate validation bypass via dropped connect options in BalancedPool
Summary
undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-supplied checkServerIdentity callback or a custom connector inside the connect option, is silently discarded before it reaches the TLS layer. As a result a peer whose certificate the application's custom checkServerIdentity was written to reject, but which still passes Node's default hostname and chain checks, is accepted when reached through BalancedPool. The Client, Pool, and Agent dispatchers are not affected because they extract the connect and tls options before cloning. This affects undici versions from 7.24.1 up to 7.29.1 and from 8.0.0 up to 8.10.2, and only when the application supplies a function-valued connect or tls option to BalancedPool. Users should upgrade to undici 7.29.1 or 8.10.2.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 18:35 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
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CVE-2026-84850 (GCVE-0-2026-84850)
Vulnerability from cvelistv5 – Published: 2026-09-15 19:11 – Updated: 2026-09-20 00:38
VLAI
EPSS
VEX
Summary
Improper certificate validation in the shared HTTP client used by synchronization and integration features in Devolutions Server 2026.2.16 and earlier allows a network-positioned attacker to intercept and tamper with outbound TLS connections via a spoofed or self-signed certificate.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-20 00:38 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Devolutions | Server |
Affected:
0 , ≤ 2026.2.16
(custom)
|
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CVE-2026-84736 (GCVE-0-2026-84736)
Vulnerability from cvelistv5 – Published: 2026-09-03 16:10 – Updated: 2026-09-03 17:38
VLAI
EPSS
VEX
Summary
In the current development version of Eclipse aeriOS, for which no official release has yet been published, the Federator component disables TLS certificate validation for outbound HTTPS connections by default. When the TLS_CERTIFICATE_VALIDATION environment variable is unset or set to false, the component configures its HTTP transport to skip TLS certificate verification.
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Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 17:38 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse aeriOS |
Affected:
d730017a4a0e2a31feba6258bd780efbce7e0d5d , < 9c63b60becc9873b0195ff9cd6582b69cb12d4f2
(git)
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CVE-2026-84465 (GCVE-0-2026-84465)
Vulnerability from cvelistv5 – Published: 2026-09-25 18:19 – Updated: 2026-09-29 18:08
VLAI
EPSS
VEX
Title
Zammad: S/MIME signature verification allows forged sender impersonation
Summary
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is already stored in the system. An attacker can create their own certificate using the name of a real, previously trusted sender and use it to send a forged email. Zammad will display that email with the same "validly signed" indicator as a genuine message from the real sender, even though the attacker never had access to that sender's actual certificate or private key. This issue is fixed in version 7.1.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 18:07 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/zammad/zammad/security/advisor… | x_refsource_CONFIRM |
| https://github.com/zammad/zammad/commit/9a07d0b82… | x_refsource_MISC |
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CVE-2026-84197 (GCVE-0-2026-84197)
Vulnerability from cvelistv5 – Published: 2026-09-08 20:01 – Updated: 2026-09-09 20:51
VLAI
EPSS
VEX
Summary
In Eclipse Ditto's Node.js JavaScript client, all released versions of @eclipse-ditto/ditto-javascript-client-node from 2.0.0 to 3.9.0 and of its predecessor package @eclipse-ditto/ditto-javascript-client-node_1.0 from 1.0.0 to 2.1.0, the WebSocket transport hard-codes rejectUnauthorized: false when creating the underlying ws WebSocket. Certificate chain and hostname validation are therefore disabled for every wss:// connection, and no builder option, constructor argument or environment variable lets an application turn validation back on. An attacker in a position to intercept the connection can present an arbitrary certificate, complete the TLS handshake, read the credentials that the configured authentication provider sends in the Authorization header of the WebSocket upgrade request, and read, alter or inject Ditto Protocol messages for the lifetime of the connection. The Java client, the browser/DOM JavaScript client and the HTTP transport of the Node.js client are not affected.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 20:40 UTC
CWE
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse Ditto |
Affected:
2.0.0 , < 3.8.1
(semver)
Affected: 3.9.0 , < 3.9.1 (semver) |
|
| Eclipse Foundation | Eclipse Ditto |
Affected:
1.0.0 , ≤ 2.1.0
(semver)
|
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CVE-2026-84081 (GCVE-0-2026-84081)
Vulnerability from cvelistv5 – Published: 2026-09-18 19:48 – Updated: 2026-09-23 03:55
VLAI
EPSS
VEX
Title
IBM Guardium Data Protection is affected by multiple vulnerabilities.
Summary
IBM Guardium Data Protection 12.2 could allow a remote attacker to bypass security restrictions due to improper certificate validation.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 00:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7288035 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Guardium Data Protection |
Affected:
12.2
cpe:2.3:a:ibm:guardium_data_protection:12.2:*:*:*:*:*:*:* cpe:2.3:a:ibm:guardium_data_protection:12.2.0:*:*:*:*:*:*:* |
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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.