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CWE-295
Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.
CVE-2026-42791 (GCVE-0-2026-42791)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:23 – Updated: 2026-05-27 15:41
VLAI
EPSS
VEX
Title
OCSP responder certificate validity period not checked in public_key
Summary
Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP responses signed with an expired responder certificate to be accepted as valid.
OCSP response verification in pubkey_ocsp:verify_response/5 and pubkey_ocsp:is_authorized_responder/3 in lib/public_key/src/pubkey_ocsp.erl does not check the validity period (notBefore/notAfter) of the OCSP responder certificate. An attacker who has obtained the private key of an expired CA-designated OCSP responder certificate can forge OCSP responses that Erlang/OTP accepts as valid.
This affects TLS clients using OCSP stapling via the ssl application: a malicious or compromised server can present a revoked TLS certificate together with a forged OCSP response signed by an expired responder key, and the client will accept the revoked certificate as valid. It also affects applications calling public_key:pkix_ocsp_validate/5 directly, where the impact depends on the use case — server-side client certificate validation using this API may allow authentication bypass with a revoked client certificate.
This issue affects OTP from OTP 27.0 before OTP 27.3.4.12, 28.5.0.1, and 29.0.1 corresponding to public_key from 1.16 before 1.17.1.3, 1.20.3.1, and 1.21.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-42791.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-42791 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/7995f1fdaee3… | patch |
| https://github.com/erlang/otp/commit/b3870e02405c… | patch |
Impacted products
Credits
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CVE-2026-4370 (GCVE-0-2026-4370)
Vulnerability from cvelistv5 – Published: 2026-04-01 08:09 – Updated: 2026-04-08 07:27
VLAI
EPSS
VEX
Title
Improper TLS Client/Server authentication and certificate verification on Database Cluster
Summary
A vulnerability was identified in Juju from version 3.2.0 until 3.6.19 and from version 4.0 until 4.0.4, where the internal Dqlite database cluster fails to perform proper TLS client and server authentication. Specifically, the Juju controller's database endpoint does not validate client certificates when a new node attempts to join the cluster. An unauthenticated attacker with network reachability to the Juju controller's Dqlite port can exploit this flaw to join the database cluster. Once joined, the attacker gains full read and write access to the underlying database, allowing for total data compromise.
Severity
10 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
Credits
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CVE-2026-4396 (GCVE-0-2026-4396)
Vulnerability from cvelistv5 – Published: 2026-03-18 19:41 – Updated: 2026-03-18 20:10
VLAI
EPSS
VEX
Summary
Improper certificate validation in Devolutions Hub Reporting Service
2025.3.1.1 and earlier allows a network attacker to perform a
man-in-the-middle attack via disabled TLS certificate verification.
Severity
8.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Devolutions | Hub Reporting Service |
Affected:
0 , ≤ 2025.3.1.1
(custom)
|
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CVE-2026-44213 (GCVE-0-2026-44213)
Vulnerability from cvelistv5 – Published: 2026-05-26 21:34 – Updated: 2026-05-27 15:51
VLAI
EPSS
VEX
Title
OpenTelemetry.Exporter.Instana bypasses TLS certificate validation when a proxy is configured
Summary
The OpenTelemetry.Exporter.Instana exports telemetry to Instana backend. Prior to 1.1.0, the OpenTelemetry.Exporter.Instana NuGet package does not validate HTTPS/TLS certificates are valid when sending telemetry to a configured Instana back-end when a proxy is configured using the INSTANA_ENDPOINT_PROXY environment variable. If a network attacker can Man-in-the-Middle (MitM) the proxy connection, all OpenTelemetry telemetry data and the Instana API key are exposed to the attacker. This vulnerability is fixed in 1.1.0.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/open-telemetry/opentelemetry-d… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| open-telemetry | opentelemetry-dotnet-contrib |
Affected:
< 1.1.0
|
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CVE-2026-44305 (GCVE-0-2026-44305)
Vulnerability from cvelistv5 – Published: 2026-05-12 21:28 – Updated: 2026-05-13 14:26
VLAI
EPSS
VEX
Title
Lemur: LDAP TLS certificate verification globally disabled enables credential interception
Summary
Lemur manages TLS certificate creation. Prior to 1.9.0, when LDAP TLS is enabled (LDAP_USE_TLS = True), Lemur's LDAP authentication module unconditionally disables TLS certificate verification at the global ldap module level. This allows a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. This vulnerability is fixed in 1.9.0.
Severity
6.8 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Netflix/lemur/security/advisor… | x_refsource_CONFIRM |
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CVE-2026-44309 (GCVE-0-2026-44309)
Vulnerability from cvelistv5 – Published: 2026-05-15 16:22 – Updated: 2026-05-15 17:43
VLAI
EPSS
VEX
Title
gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/gitsign/security/advi… | x_refsource_CONFIRM |
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CVE-2026-44312 (GCVE-0-2026-44312)
Vulnerability from cvelistv5 – Published: 2026-05-14 16:15 – Updated: 2026-05-15 18:05
VLAI
EPSS
VEX
Title
css_parser allows to MITM included https css urls
Summary
css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0, the CSS Parser gem does not validate HTTPS connections, allowing a Man-in-the-Middle (MITM) attacker to inject or modify CSS content when stylesheets are loaded via HTTPS. The connection is established with OpenSSL::SSL::VERIFY_NONE, meaning any HTTPS certificate—even entirely untrusted—will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/premailer/css_parser/security/… | x_refsource_CONFIRM |
| https://github.com/premailer/css_parser/issues/185 | x_refsource_MISC |
| https://github.com/premailer/css_parser/commit/35… | x_refsource_MISC |
| https://github.com/premailer/css_parser/commit/e0… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| premailer | css_parser |
Affected:
>= 2.0.0, < 2.1.0
Affected: < 1.22.0 |
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CVE-2026-4434 (GCVE-0-2026-4434)
Vulnerability from cvelistv5 – Published: 2026-03-20 12:52 – Updated: 2026-03-23 14:12
VLAI
EPSS
VEX
Summary
Improper certificate validation in the PAM propagation WinRM connections
allows a network attacker to perform a man-in-the-middle attack via
disabled TLS certificate verification.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Devolutions | Server |
Affected:
0 , < 2026.1
(custom)
|
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CVE-2026-44363 (GCVE-0-2026-44363)
Vulnerability from cvelistv5 – Published: 2026-05-13 19:16 – Updated: 2026-05-14 12:31
VLAI
EPSS
VEX
Title
Unsafe remote resource fetching in expansion misp-modules
Summary
MISP modules are autonomous modules that can be used to extend MISP for new services. Prior to 3.0.7, an unsafe remote resource fetching vulnerability existed in MISP Modules expansion modules. The html_to_markdown module accepted arbitrary HTTP(S) URLs without sufficient validation, which could allow Server-Side Request Forgery against loopback, private, or link-local network resources. Additionally, the qrcode module disabled TLS certificate verification when retrieving remote images, exposing requests to potential man-in-the-middle interception or response tampering. The issue was fixed by validating URL schemes, blocking local and private address ranges, resolving hostnames before fetching, enforcing request timeouts, and re-enabling TLS certificate verification. This vulnerability is fixed in 3.0.7.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/MISP/misp-modules/security/adv… | x_refsource_CONFIRM |
| https://github.com/MISP/misp-modules/commit/01a52… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MISP | misp-modules |
Affected:
< 3.0.7
|
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CVE-2026-44700 (GCVE-0-2026-44700)
Vulnerability from cvelistv5 – Published: 2026-05-14 20:51 – Updated: 2026-05-15 11:22
VLAI
EPSS
VEX
Title
Elixir WebRTC: Missing DTLS peer fingerprint validation in ex_webrtc client-role handshake
Summary
Elixir WebRTC is an Elixir implementation of the W3C WebRTC API. Prior to 0.15.1 and 0.16.1, missing DTLS peer certificate fingerprint validation in the DTLS client (active) role removes one side of WebRTC's mutual authentication. The bug is not independently exploitable for media interception in standard deployments, but enables a full man-in-the-middle attack when chained with insecure signalling or a peer with similar validation gaps. This vulnerability is fixed in 0.15.1 and 0.16.1.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/elixir-webrtc/ex_webrtc/securi… | x_refsource_CONFIRM |
| https://github.com/elixir-webrtc/ex_webrtc/issues/249 | x_refsource_MISC |
| https://github.com/elixir-webrtc/ex_webrtc/pull/250 | x_refsource_MISC |
| https://github.com/elixir-webrtc/ex_webrtc/releas… | x_refsource_MISC |
| https://github.com/elixir-webrtc/ex_webrtc/releas… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-webrtc | ex_webrtc |
Affected:
< 0.15.1
Affected: >= 0.16.0, < 0.16.1 |
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Mitigation
Phases: Architecture and Design, Implementation
Description:
- Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation
Phase: Implementation
Description:
- 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.