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.
156 vulnerabilities reference this CWE, most recent first.
CVE-2026-107819 (GCVE-0-2026-107819)
Vulnerability from cvelistv5 – Published: 2026-10-09 17:25 – Updated: 2026-10-09 17:59
VLAI
EPSS
VEX
Title
MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure
Summary
MariaDB Connector/C is a C and C++ client library for connecting applications to MariaDB and MySQL databases. From 3.4.1 until 3.4.10, the MariaDB Connector/C libmariadb Zero-Configuration SSL authentication-switch logic checked certificate trust failure but did not reject a TLS hostname verification mismatch before selecting a non-hashing authentication plugin. An active man-in-the-middle attacker with a valid certificate for another hostname could request mysql_clear_password and obtain the database password inside the attacker-controlled TLS connection. Other MariaDB connectors are not affected. This issue is fixed in version 3.4.10.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 17:59 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/MariaDB/server/security/adviso… | x_refsource_CONFIRM |
| https://github.com/mariadb-corporation/mariadb-co… | x_refsource_MISC |
| https://github.com/mariadb-corporation/mariadb-co… | x_refsource_MISC |
| https://jira.mariadb.org/browse/CONC-846 | x_refsource_MISC |
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CVE-2026-107660 (GCVE-0-2026-107660)
Vulnerability from cvelistv5 – Published: 2026-10-08 15:28 – Updated: 2026-10-08 17:25
VLAI
EPSS
VEX
Title
FFmpeg before 8.1.3 and 9.x before 9.0.2 mbedTLS Hostname Verification Bypass for IP Hosts
Summary
FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an improper certificate validation vulnerability in tls_open() of libavformat/tls_mbedtls.c, which skips hostname checks for IP-address hosts. Network attackers can intercept https, rtmps, or tls connections to IP-literal URLs with any trusted CA-issued certificate to read and tamper with streams.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 17:25 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24383 | patch |
| https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/57a2… | patch |
| https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/d377… | patch |
| https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/0cd2… | patch |
| https://github.com/FFmpeg/FFmpeg/blob/n9.0.1/liba… | technical-description |
| https://ffmpeg.org/ | product |
| https://www.vulncheck.com/advisories/ffmpeg-befor… | third-party-advisory |
Impacted products
Date Public
2026-09-06 16:10
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CVE-2026-102669 (GCVE-0-2026-102669)
Vulnerability from cvelistv5 – Published: 2026-10-01 19:43 – Updated: 2026-10-11 17:05
VLAI
EPSS
VEX
Title
Joyland AI hostname checking disabled
Summary
Joyland AI app does not verify hostnames, allowing a malicious host to connect or intercept chat messages.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 16:54 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.cve.org/CVERecord?id=CVE-2026-102669 | vdb-entry |
| https://raw.githubusercontent.com/cisagov/CSAF/de… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Joyland | Joyland.ai |
Affected:
*
|
Date Public
2026-10-01 00:00
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CVE-2026-92943 (GCVE-0-2026-92943)
Vulnerability from cvelistv5 – Published: 2026-09-17 19:14 – Updated: 2026-09-17 19:57
VLAI
EPSS
VEX
Title
Improper validation of certificate with host mismatch in AWS IoT Device SDK for Python
Summary
Improper validation of certificate with host mismatch in the MQTT client TLS connection layer in AWS IoT Device SDK for Python 1.5.3 through 1.6.0 on Python 3.7 and later might allow an adversary-in-the-middle actor to impersonate the AWS IoT Core endpoint, read device telemetry, and inject arbitrary MQTT messages that the device processes as authentic, via a certificate issued for an unrelated hostname by a certificate authority present in the device trust store.
To remediate this issue, users should upgrade to version 1.6.1.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 19:56 UTC
CWE
- CWE-297 - Improper validation of certificate with host mismatch
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://pypi.org/project/AWSIoTPythonSDK/1.6.1/ | patchrelease-notes |
| https://github.com/aws/aws-iot-device-sdk-python/… | patchrelease-notes |
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/aws/aws-iot-device-sdk-python/… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | AWSIoTPythonSDK |
Affected:
1.5.3 , ≤ 1.6.0
(custom)
cpe:2.3:a:aws:awsiotpythonsdk:*:*:*:*:*:*:*:* |
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CVE-2026-91769 (GCVE-0-2026-91769)
Vulnerability from cvelistv5 – Published: 2026-09-25 20:59 – Updated: 2026-10-04 16:10
VLAI
EPSS
VEX
Title
TLS Hostname Verification Falls Back to CN After SAN Mismatch
Summary
PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 12:56 UTC
CWE
- CWE-297 - Improper validation of certificate with host mismatch
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/php/php-src/security/advisorie… | vendor-advisory |
Impacted products
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CVE-2026-91166 (GCVE-0-2026-91166)
Vulnerability from cvelistv5 – Published: 2026-09-21 18:53 – Updated: 2026-09-24 22:32
VLAI
EPSS
VEX
Title
Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target
Summary
Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.25.0 until 0.27.6, the browser SSH path in warpgate-web-ssh/src/manager.rs handles RCEvent::HostKeyUnknown without the presenting hop identity and instead passes ssh_options.host and ssh_options.port for the final target to KnownHosts::trust. In Prompt and AutoAccept modes, a jump host key can therefore be stored for the target address. A machine later presenting the jump host key at the target address can be accepted as the target, allowing interception of user traffic and a newly issued certificate when certificate authentication is used. The native SSH path is unaffected because it tracks each hop separately. This issue is fixed in version 0.27.6.
Severity
5.7 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 22:31 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/warp-tech/warpgate/security/ad… | x_refsource_CONFIRM |
| https://github.com/warp-tech/warpgate/commit/fb66… | x_refsource_MISC |
| https://github.com/warp-tech/warpgate/releases/ta… | x_refsource_MISC |
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CVE-2026-85974 (GCVE-0-2026-85974)
Vulnerability from cvelistv5 – Published: 2026-10-12 16:50 – Updated: 2026-10-14 10:51
VLAI
EPSS
VEX
Title
Improper TLS hostname verification in Progress MarkLogic Server
Summary
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 do not consistently validate TLS certificate hostnames for certain outbound connections. A network-positioned attacker could exploit this weakness to intercept or modify communications with an affected service.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 03:59 UTC
CWE
- CWE-297 - Improper Validation of Certificate with Host Mismatch
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://community.progress.com/s/article/Marklogi… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Progress Software Corporation | MarkLogic Server |
Affected:
11.0.0 , < 11.3.7
(custom)
Affected: 12.0.0 , < 12.1.0 (custom) |
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CVE-2026-85088 (GCVE-0-2026-85088)
Vulnerability from cvelistv5 – Published: 2026-10-02 11:37 – Updated: 2026-10-02 17:40
VLAI
EPSS
VEX
Title
Apache Thrift, Apache Thrift: The C++ and D clients fall back to the certificate Common Name when subjectAltName entries are present but do not match
Summary
Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift.
Both libraries install a default access manager for client sockets — TSSLSocketFactory does so in C++, and the accessManager property does so in D — which compares the peer certificate against the host
name that was connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a "skip" result rather than
a rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.
RFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a
Common Name for another is therefore accepted for a connection to the second name.
Exploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host
name. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.
This issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 17:39 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/33otcgbqd27wf6qq8… | vendor-advisory |
| https://lists.apache.org/thread/zcgm7lx6037lvgvn8… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.25.0
(semver)
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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-2026-84393 (GCVE-0-2026-84393)
Vulnerability from cvelistv5 – Published: 2026-09-08 16:41 – Updated: 2026-10-15 01:24
VLAI
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 00:00 UTC
CWE
- CWE-297 - Information disclosure
Assigner
References
Impacted products
3 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:*:*:*:*:*:*:* |
|
| 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:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
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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.