Common Weakness Enumeration
CWE-297
AllowedImproper Validation of Certificate with Host Mismatch
Abstraction: Variant · Status: Incomplete
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.
120 vulnerabilities reference this CWE, most recent first.
CVE-2026-66053 (GCVE-0-2026-66053)
Vulnerability from cvelistv5 – Published: 2026-07-27 11:18 – Updated: 2026-07-27 13:08
VLAI
EPSS
VEX
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)
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
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/7v3jhgwfbmhx42424… | vendor-advisory |
| https://lists.apache.org/thread/w4k5dnv1x58knwlhp… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.24.0
(semver)
|
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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
EPSS
VEX
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)
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
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Ranger |
Affected:
0 , ≤ 2.8.0
(semver)
|
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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
EPSS
VEX
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
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
2 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/netty-throug… | third-party-advisory |
Impacted products
Date Public
2026-08-07 00:00
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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
EPSS
VEX
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
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
3 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/799bd1532… | patch |
| https://github.com/bcgit/bc-java/commit/5ac55351c… | patch |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
1.61 , < 1.85
(maven)
|
|
| Legion of the Bouncy Castle Inc. | BC-LTS-JAVA |
Affected:
2.73.0 , < 2.73.12
(maven)
|
|
| 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) |
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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
EPSS
VEX
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
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
1 reference
| URL | Tags |
|---|---|
| https://github.com/aio-libs/aiohttp/security/advi… | x_refsource_CONFIRM |
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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
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:03 UTC
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/libgit2/libgit2/security/advis… | x_refsource_CONFIRM |
| https://github.com/libgit2/libgit2/commit/647dcb4… | x_refsource_MISC |
| https://github.com/libgit2/libgit2/commit/c2aa354… | x_refsource_MISC |
| https://github.com/libgit2/libgit2/commit/ef086bc… | x_refsource_MISC |
| https://github.com/libgit2/libgit2/releases/tag/v1.8.6 | x_refsource_MISC |
| https://github.com/libgit2/libgit2/releases/tag/v1.9.5 | x_refsource_MISC |
Impacted products
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CVE-2026-49457 (GCVE-0-2026-49457)
Vulnerability from cvelistv5 – Published: 2026-08-14 18:27 – Updated: 2026-08-14 19:30
VLAI
EPSS
VEX
Title
QUIC has Broken TLS verification
Summary
erlang_quic is a pure Erlang QUIC implementation. Prior to version 1.4.4, the QUIC client did not authenticate the server during the TLS 1.3 handshake. The CertificateVerify signature was not checked, the certificate chain was not validated, and the hostname was not compared against the certificate, so `verify` was effectively a no-op on the client. A man-in-the-middle on the network path could present any certificate and impersonate any server, defeating the confidentiality and integrity of the connection. HTTP/3 uses the same client and was equally affected. Handshakes authenticated by a PSK (session resumption) are not affected, because the peer is authenticated by the PSK binder and no certificate is sent. This is fixed in 1.4.4. The client now verifies the CertificateVerify signature, validates the certificate chain against the trust store (`cacerts` option, the operating system store by default), and checks the hostname. Client `verify` now defaults to on; set `verify => false` to accept any certificate (for example a self-signed test server). No known workarounds are available before 1.4.4. `verify => true` had no effect, and inspecting the certificate after connecting does not help because without the signature check the peer is never proven to own the certificate it presents.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 19:29 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/benoitc/erlang_quic/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| benoitc | erlang_quic |
Affected:
< 1.4.4
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CVE-2026-48145 (GCVE-0-2026-48145)
Vulnerability from cvelistv5 – Published: 2026-07-27 10:59 – Updated: 2026-07-27 13:03
VLAI
EPSS
VEX
Title
Apache Thrift: C++ TSSLSocket matchName() RFC 6125 Wildcard Bypass
Summary
Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift C++ bindings.
This issue affects Apache Thrift: before 0.24.0.
Users are recommended to upgrade to version 0.24.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 13:02 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/7v3jhgwfbmhx42424… | vendor-advisory |
| https://lists.apache.org/thread/2popgc4ks1l87jjho… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.24.0
(semver)
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CVE-2026-48144 (GCVE-0-2026-48144)
Vulnerability from cvelistv5 – Published: 2026-07-27 10:58 – Updated: 2026-07-28 03:55
VLAI
EPSS
VEX
Title
Apache Thrift: c_glib TLS Client Missing Hostname Verification
Summary
Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift c_glib bindings.
This issue affects Apache Thrift: before 0.24.0.
Users are recommended to upgrade to version 0.24.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 00:00 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/7v3jhgwfbmhx42424… | vendor-advisory |
| https://lists.apache.org/thread/2xoltfxgzf5jyhcwq… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.24.0
(semver)
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CVE-2026-44467 (GCVE-0-2026-44467)
Vulnerability from cvelistv5 – Published: 2026-05-13 15:40 – Updated: 2026-05-14 18:29
VLAI
EPSS
VEX
Title
Claude Desktop: SSH Host Key Verification Bypass Allows Man-in-the-Middle Attack on Remote Sessions
Summary
The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side. From 1.2581.0 to before 1.4304.0, Claude Desktop's SSH remote development feature verified only whether a hostname existed in ~/.ssh/known_hosts without comparing the server's presented host key against the stored key. This allowed a network-positioned attacker to present an arbitrary SSH host key and have the connection silently accepted, enabling a man-in-the-middle attack on remote development sessions. Successful exploitation required the attacker to be in a network position to intercept SSH traffic (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) and the target hostname to already have an entry in the victim's known_hosts file. This vulnerability is fixed in 1.4304.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 18:28 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/anthropics/claude-code/securit… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| anthropics | claude-code |
Affected:
>= 1.2581.0, < 1.4304.0
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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.