Common Weakness Enumeration

CWE-347

Allowed

Improper Verification of Cryptographic Signature

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

1442 vulnerabilities reference this CWE, most recent first.

CVE-2026-108699 (GCVE-0-2026-108699)

Vulnerability from cvelistv5 – Published: 2026-10-11 13:25 – Updated: 2026-10-11 13:25
VLAI
Title
hyper-mcp through 0.8.3 Improper Signature Verification of OCI WebAssembly Plugins
Summary
hyper-mcp through 0.8.3 contains an improper signature verification vulnerability that allows attackers to load malicious WebAssembly plugins because cosign_verify_args() accepts any signer identity and OIDC issuer by default. Attackers controlling a plugin image reference can sign a malicious image with a free Sigstore keyless certificate to execute plugins with configured host, filesystem, and environment capabilities.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5802 records in the last 180 days details
References
Impacted products
Vendor Product Version
hyper-mcp-rs hyper-mcp Affected: 0 , ≤ 0.8.3 (semver)
Create a notification for this product.
Date Public
2026-10-11 00:00
Credits
hieuPenguinnn
Show details on NVD website
To clipboard 

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CVE-2026-107724 (GCVE-0-2026-107724)

Vulnerability from cvelistv5 – Published: 2026-10-08 21:53 – Updated: 2026-10-09 15:51
VLAI
Title
fast-jwt treats raw public JWK JSON as an HMAC secret, enabling HS256 token forgery
Summary
fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric key material. If HS256 is explicitly allowed or inferred, an attacker who knows the exact serialized public-key bytes can use those bytes as an HMAC key and create a token containing arbitrary claims that createVerifier accepts. Serialization ordering or whitespace differences can prevent exploitation, and applications using supported PEM keys with an asymmetric-only algorithm allowlist are not affected. This issue is fixed in version 6.3.0.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 15:51 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7566 records in the last 180 days details
References
Impacted products
Vendor Product Version
nearform fast-jwt Affected: >= 6.2.4, < 6.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-107722 (GCVE-0-2026-107722)

Vulnerability from cvelistv5 – Published: 2026-10-08 21:49 – Updated: 2026-10-08 21:49
VLAI
Title
fast-jwt: Incomplete patch of CVE-2026-34950: Non-whitespace key-prefix re-enables RSA→HS256 algorithm confusion
Summary
fast-jwt provides fast JSON Web Token (JWT) implementation. From 6.2.0 until 6.3.0, fast-jwt can misclassify RSA public-key text as an HMAC secret when the key has non-whitespace content before its PEM header. In src/crypto.js, performDetectPublicKeyAlgorithms trims whitespace but publicKeyPemMatcher remains start-anchored, so comments, control characters, zero-width characters, or wrapper text can prevent PEM detection and reach the HMAC fallback. An attacker who knows the public key bytes can sign arbitrary HS256 claims with that public material when HS256 is inferred or allowed, resulting in authentication or authorization bypass. An asymmetric-only algorithm allowlist prevents the attack. This issue is fixed in version 6.3.0.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7566 records in the last 180 days details
References
Impacted products
Vendor Product Version
nearform fast-jwt Affected: >= 6.2.0, < 6.3.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-107720 (GCVE-0-2026-107720)

Vulnerability from cvelistv5 – Published: 2026-10-08 21:44 – Updated: 2026-10-09 14:32
VLAI
Title
fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set
Summary
fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.1, fast-jwt createVerifier accepts an unsigned JWT when key is an empty string or null and algorithms is a non-empty allowlist. Falsy synchronous keys bypass prepareKeyOrSecret, allowedAlgorithms remains active, hasKey is false, and the empty signature avoids the verifySignature gate. An attacker can therefore submit a token containing arbitrary claims without possessing a signing key, resulting in authentication or authorization bypass. Claim validators still run, and non-empty keys, an empty key without algorithms, and the async key resolver path do not have this behavior. This issue is fixed in version 6.3.1.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 14:31 UTC
CWE
  • CWE-20 - Improper Input Validation
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7566 records in the last 180 days details
References
Impacted products
Vendor Product Version
nearform fast-jwt Affected: < 6.3.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-106581 (GCVE-0-2026-106581)

Vulnerability from cvelistv5 – Published: 2026-10-09 13:40 – Updated: 2026-10-09 16:46
VLAI
Title
Docker Desktop for Windows installer failed to verify external packages
Summary
Before 4.92.0, Docker Desktop for Windows did not verify the signature of a package supplied to Docker Desktop Installer.exe install -package. An attacker able to provide a crafted package and convince a user to approve the Docker-signed UAC prompt could execute attacker-controlled installer actions as LocalSystem.
Severity
8.2 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 16:16 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Docker CNA under the mitre root
CNA scorecard B 88/100 over 32 records in the last 180 days details
References
Impacted products
Vendor Product Version
Docker Docker Desktop Affected: 0 , < 4.92.0 (semver)
    cpe:2.3:a:docker:desktop:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Trung Nguyen (@everping) of CyStack
Show details on NVD website
To clipboard 

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CVE-2026-105161 (GCVE-0-2026-105161)

Vulnerability from cvelistv5 – Published: 2026-10-04 16:30 – Updated: 2026-10-06 22:02 Unsupported When Assigned
VLAI
Title
invariant-systems-ai aiir Policy Gate signature verification
Summary
A flaw has been found in invariant-systems-ai aiir up to 1.7.0. The affected element is an unknown function of the component Policy Gate Handler. Executing a manipulation can lead to improper verification of cryptographic signature. The attack can be executed remotely. It is advisable to upgrade the affected component. The GitHub repository of this project is not available anymore. This vulnerability only affects products that are no longer supported by the maintainer.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 22:02 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-345 - Insufficient Verification of Data Authenticity
Assigner
VulDB CNA under the mitre root
CNA scorecard B 82/100 over 3818 records in the last 180 days details
References
Impacted products
Vendor Product Version
invariant-systems-ai aiir Affected: 1.0
Affected: 1.1
Affected: 1.2
Affected: 1.3
Affected: 1.4
Affected: 1.5
Affected: 1.6
Affected: 1.7.0
    cpe:2.3:a:invariant-systems-ai:aiir:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
VulDB CNA Team
Show details on NVD website
To clipboard 

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CVE-2026-105118 (GCVE-0-2026-105118)

Vulnerability from cvelistv5 – Published: 2026-10-03 12:14 – Updated: 2026-10-05 14:45
VLAI
Title
OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSession
Summary
OpenAM before 16.1.3 contains an open redirect vulnerability that allows unauthenticated attackers to redirect users by supplying an unverified id_token_hint to the /oauth2/connect/endSession endpoint. Attackers can name any realm client in a forged hint to redirect victims to any registered post-logout URI, enabling phishing that borrows the OpenAM host's trust.
Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 14:45 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5802 records in the last 180 days details
References
Impacted products
Vendor Product Version
OpenIdentityPlatform OpenAM Affected: 0 , < 16.1.3 (semver)
Unaffected: 16.1.3 (semver)
    cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-18 00:00
Credits
rockmelodies santhreal maximthomas tsujiguchitky
Show details on NVD website
To clipboard 

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CVE-2026-104437 (GCVE-0-2026-104437)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-06 02:42
VLAI
Title
Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling
Summary
Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transactions with fewer outputs than inputs that Zebra accepts and templates via getblocktemplate, producing blocks zcashd rejects.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 02:42 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5802 records in the last 180 days details
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: 0 , < 4.4.0 (semver)
Unaffected: 4.4.0 (semver)
    cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-02 00:00
Credits
sangsoo-osec defuse mpguerra upbqdn
Show details on NVD website
To clipboard 

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CVE-2026-104435 (GCVE-0-2026-104435)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-02 15:16
VLAI
Title
Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output
Summary
Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 15:16 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5802 records in the last 180 days details
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: 4.4.0 , < 4.4.1 (semver)
Unaffected: 4.4.1 (semver)
Create a notification for this product.
ZcashFoundation zebra Affected: 6.0.0 , < 6.0.1 (semver)
Unaffected: 6.0.1 (semver)
Create a notification for this product.
Date Public
2026-05-04 00:00
Credits
sangsoo-osec fivelittleducks
Show details on NVD website
To clipboard 

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CVE-2026-103902 (GCVE-0-2026-103902)

Vulnerability from cvelistv5 – Published: 2026-10-12 10:25 – Updated: 2026-10-12 10:25
VLAI
Title
DigiDoc improper signature verification
Summary
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
ENISA CNA under the ENISA root
CNA scorecard B 79/100 over 37 records in the last 180 days details
References
Impacted products
Vendor Product Version
DigiDoc libdigidocpp Affected: 4.0.0 , < 4.5.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc4 Affected: 4.6.0 , < 4.11.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc Android Affected: 2.7.0 , < 3.1.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc iOS Affected: 2.7.0 , < 3.1.0 (semver)
Create a notification for this product.
Date Public
2026-10-12 10:00
Show details on NVD website
To clipboard 

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No mitigation information available for this CWE.

CAPEC-463: Padding Oracle Crypto Attack

An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.

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.

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