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Common Weakness Enumeration

CWE-297

Allowed

Improper Validation of Certificate with Host Mismatch

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.

130 vulnerabilities reference this CWE, most recent first.

CVE-2026-84393 (GCVE-0-2026-84393)

Vulnerability from cvelistv5 – Published: 2026-09-08 16:41 – Updated: 2026-09-10 03:56
VLAI
Summary
A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>
Severity
7.3 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
Fortinet FortiOS Affected: 7.6.1 , ≤ 7.6.6 (semver)
    cpe:2.3:o:fortinet:fortios:7.6.6:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.5:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.4:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.3:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.2:*:*:*:*:*:*:*
    cpe:2.3:o:fortinet:fortios:7.6.1:*:*:*:*:*:*:*
Create a notification for this product.
Fortinet FortiProxy Affected: 7.6.2 , ≤ 7.6.6 (semver)
    cpe:2.3:a:fortinet:fortiproxy:7.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortiproxy:7.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortiproxy:7.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortiproxy:7.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortiproxy:7.6.2:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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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
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
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 20:40 UTC
CWE
  • CWE-295 - Improper certificate validation
  • CWE-297 - Improper validation of certificate with host mismatch
  • CWE-300 - Channel Accessible by Non-Endpoint
Assigner
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Ditto Affected: 2.0.0 , < 3.8.1 (semver)
Affected: 3.9.0 , < 3.9.1 (semver)
Create a notification for this product.
Eclipse Foundation Eclipse Ditto Affected: 1.0.0 , ≤ 2.1.0 (semver)
Create a notification for this product.
Credits
Eclipse Foundation Security Team
Show details on NVD website
To clipboard 

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CVE-2026-79943 (GCVE-0-2026-79943)

Vulnerability from cvelistv5 – Published: 2026-09-07 15:50 – Updated: 2026-09-08 16:54
VLAI
Summary
Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to 5.36.00.00, contains an Improper Validation of Certificate with Host Mismatch vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to protection mechanism bypass.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 16:37 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
Dell Secure Connect Gateway 5.0 - Application Affected: 0 , < 5.36.00.00 or later (semver)
Create a notification for this product.
Dell Secure Connect Gateway 5.0 - Appliance Affected: 0 , < 5.36.00.16 or later (semver)
Create a notification for this product.
Date Public
2026-08-31 06:30
Show details on NVD website
To clipboard 

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CVE-2026-79636 (GCVE-0-2026-79636)

Vulnerability from cvelistv5 – Published: 2026-09-09 08:03 – Updated: 2026-09-09 12:59
VLAI
Summary
Dell SCG 5.0 Appliance versions prior to 5.36.00.16 and Dell SCG 5.0 Application versions prior to 5.36.00.00, contains an Improper Validation of Certificate with Host Mismatch vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to unauthorized access.
Severity
7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 12:59 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
Dell Secure Connect Gateway 5.0 - Application Affected: 0 , < 5.36.00.00 or later (semver)
Create a notification for this product.
Dell Secure Connect Gateway 5.0 - Appliance Affected: 0 , < 5.36.00.16 or later (semver)
Create a notification for this product.
Date Public
2026-08-31 06:30
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CVE-2026-66053 (GCVE-0-2026-66053)

Vulnerability from cvelistv5 – Published: 2026-07-27 11:18 – Updated: 2026-07-27 13:08
VLAI
Title
Apache Thrift: Python TSSLSocket Hostname Matcher Import
Summary
Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift Python bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue. This replaces CVE-2026-41603
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 13:08 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Thrift Affected: 0 , < 0.24.0 (semver)
Create a notification for this product.
Credits
Yu Bao – yubao@paypal.com, who works for paypal.com
Show details on NVD website
To clipboard 

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CVE-2026-65942 (GCVE-0-2026-65942)

Vulnerability from cvelistv5 – Published: 2026-08-10 10:21 – Updated: 2026-08-10 19:58
VLAI
Title
Apache Ranger: Clients accept TLS certificates issued for other hostnames
Summary
TLS hostname verification issue in Apache Ranger Client Code in versions <= 2.8.0. Users are recommended to upgrade to version 2.9.0, which fixes this issue.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 19:57 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Ranger Affected: 0 , ≤ 2.8.0 (semver)
Create a notification for this product.
Credits
Andrew Rukin (Arenadata)
Show details on NVD website
To clipboard 

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CVE-2026-62243 (GCVE-0-2026-62243)

Vulnerability from cvelistv5 – Published: 2026-08-22 12:26 – Updated: 2026-08-24 19:36
VLAI
Title
Netty 4.2.0 through 4.2.16 TLS Hostname Verification Bypass
Summary
Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Final disable TLS hostname verification on the SslProvider.OPENSSL client path when a plain (non-extended) X509TrustManager is used and Unsafe-based trust-manager wrapping is unavailable (Java 25+). In this configuration the OpenSSL client does not perform hostname verification, allowing a man-in-the-middle attacker to present a certificate issued for a different hostname that is accepted without validation. Fixed in 4.2.17.Final and 4.1.137.Final.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 19:36 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
netty netty Affected: 4.2.0.Final , < 4.2.16.Final (custom)
Unaffected: 4.2.16.Final (custom)
Create a notification for this product.
netty netty Affected: 0 , < 4.1.137.Final (custom)
Unaffected: 4.1.137.Final (custom)
Create a notification for this product.
Date Public
2026-08-07 00:00
Credits
violetagg
Show details on NVD website
To clipboard 

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CVE-2026-59638 (GCVE-0-2026-59638)

Vulnerability from cvelistv5 – Published: 2026-08-03 00:57 – Updated: 2026-08-03 13:23
VLAI
Title
JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
Summary
In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 13:22 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.61 , < 1.85 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-LTS-JAVA Affected: 2.73.0 , < 2.73.12 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-FJA Affected: 1.0.7 , < 1.0.24 (maven)
Affected: 2.0.0 , < 2.0.24 (maven)
Affected: 2.1.0 , < 2.1.24 (maven)
Create a notification for this product.
Credits
Alex Gaynor in collaboration with Claude and Anthropic Research
Show details on NVD website
To clipboard 

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CVE-2026-54275 (GCVE-0-2026-54275)

Vulnerability from cvelistv5 – Published: 2026-06-22 16:34 – Updated: 2026-06-22 17:27
VLAI
Title
AIOHTTP: TLS Server Hostname Override Is Ignored When Reusing HTTPS Connections
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. This vulnerability is fixed in 3.14.1.
Severity
2.7 (Low)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 17:27 UTC
CWE
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
aio-libs aiohttp Affected: < 3.14.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-53583 (GCVE-0-2026-53583)

Vulnerability from cvelistv5 – Published: 2026-08-20 18:39 – Updated: 2026-08-20 19:04
VLAI
Title
libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend
Summary
libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:03 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
Impacted products
Vendor Product Version
libgit2 libgit2 Affected: < 1.8.6
Affected: >= 1.9.0, < 1.9.5
Create a notification for this product.
Show details on NVD website
To clipboard 

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    "dateUpdated": "2026-08-20T19:04:42.247Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
Mitigation
Architecture and Design

Fully check the hostname of the certificate and provide the user with adequate information about the nature of the problem and how to proceed.

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.

No CAPEC attack patterns related to this CWE.

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