Common Weakness Enumeration
CWE-347
AllowedImproper Verification of Cryptographic Signature
Abstraction: Base · Status: Draft
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
1121 vulnerabilities reference this CWE, most recent first.
CVE-2026-6873 (GCVE-0-2026-6873)
Vulnerability from cvelistv5 – Published: 2026-06-03 13:16 – Updated: 2026-06-03 15:43
VLAI
EPSS
VEX
Title
Signed cookie salt namespace collision in django.http.HttpRequest.get_signed_cookie
Summary
An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.
`django.http.HttpRequest.get_signed_cookie` in Django uses a non-injective salt derivation (concatenating the cookie name and salt argument), which allows a remote attacker to use a cookie in a context different from the one where it was signed, via distinct `(name, salt)` pairs that produce the same concatenation.
Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.
Django would like to thank Peng Zhou for reporting this issue.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://docs.djangoproject.com/en/dev/releases/se… | vendor-advisory |
| https://groups.google.com/g/django-announce | mailing-list |
| https://www.djangoproject.com/weblog/2026/jun/03/… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| djangoproject | Django |
Affected:
6.0 , < 6.0.6
(python)
Unaffected: 6.0.6 (python) Affected: 5.2 , < 5.2.15 (python) Unaffected: 5.2.15 (python) |
Date Public
2026-06-03 08:00
Credits
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CVE-2026-6331 (GCVE-0-2026-6331)
Vulnerability from cvelistv5 – Published: 2026-06-25 20:56 – Updated: 2026-06-26 13:53
VLAI
EPSS
VEX
Title
HMAC zero-length tag forgery in EVP_DigestVerifyFinal
Summary
HMAC zero-length tag forgery in EVP_DigestVerifyFinal, where a zero-length tag could be accepted as valid during HMAC verification. In the OpenSSL-compatibility HMAC verify path the supplied signature length was only checked as not exceeding the MAC length, so a zero-length or otherwise truncated tag could pass verification. The fix requires the supplied tag length to exactly equal the MAC length and rejects a zero-length MAC, so a forged short or empty tag is no longer accepted.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
Impacted products
Credits
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CVE-2026-6329 (GCVE-0-2026-6329)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:02 – Updated: 2026-06-26 10:22
VLAI
EPSS
VEX
Title
PKCS#12 MAC verification uses attacker-controlled comparison length
Summary
PKCS#12 MAC verification uses an attacker-controlled comparison length, weakening the integrity check on the MAC and allowing a mismatched MAC to be accepted. The PKCS#12 verify path compared the locally computed HMAC against the MAC parsed from the PKCS#12 structure using a length taken directly from the attacker-supplied input, without first verifying that it equals the length of the digest actually produced by the configured algorithm. A truncated or zero-length stored MAC could therefore be accepted, defeating the integrity protection of the MAC.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
Impacted products
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CVE-2026-6328 (GCVE-0-2026-6328)
Vulnerability from cvelistv5 – Published: 2026-04-15 03:18 – Updated: 2026-04-15 16:13
VLAI
EPSS
VEX
Title
XQUIC Improper STREAM Frame Validation in Initial/Handshake Packets
Summary
Improper input validation, Improper verification of cryptographic signature vulnerability in XQUIC Project XQUIC xquic on Linux (QUIC protocol implementation, packet processing module, STREAM frame handler modules) allows Protocol Manipulation.This issue affects XQUIC: through 1.8.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| XQUIC Project | XQUIC |
Affected:
0 , ≤ 1.8.3
(custom)
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CVE-2026-5466 (GCVE-0-2026-5466)
Vulnerability from cvelistv5 – Published: 2026-04-10 03:00 – Updated: 2026-04-22 03:55
VLAI
EPSS
VEX
Title
wc_VerifyEccsiHash missing sanity check
Summary
wolfSSL's ECCSI signature verifier `wc_VerifyEccsiHash` decodes the `r` and `s` scalars from the signature blob via `mp_read_unsigned_bin` with no check that they lie in `[1, q-1]`. A crafted forged signature could verify against any message for any identity, using only publicly-known constants.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper verification of cryptographic signature
Assigner
References
1 reference
Date Public
2026-04-10 03:00
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CVE-2026-5050 (GCVE-0-2026-5050)
Vulnerability from cvelistv5 – Published: 2026-04-16 05:29 – Updated: 2026-04-16 13:42
VLAI
EPSS
VEX
Title
Payment Gateway for Redsys & WooCommerce Lite <= 7.0.0 - Improper Verification of Cryptographic Signature to Unauthenticated Payment Status Manipulation
Summary
The Payment Gateway for Redsys & WooCommerce Lite plugin for WordPress is vulnerable to Improper Verification of Cryptographic Signature in versions up to, and including, 7.0.0 due to successful_request() handlers calculating a local signature but not validating Ds_Signature from the request before accepting payment status across the Redsys, Bizum, and Google Pay gateway flows. This makes it possible for unauthenticated attackers to forge payment callback data and mark pending orders as paid when they know a valid order key and order amount, potentially allowing checkout completion and product or service fulfillment without a successful payment.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jconti | Payment Gateway for Redsys & WooCommerce Lite |
Affected:
0 , ≤ 7.0.0
(semver)
|
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CVE-2026-4541 (GCVE-0-2026-4541)
Vulnerability from cvelistv5 – Published: 2026-03-22 08:35 – Updated: 2026-04-18 03:39 X_Open Source
VLAI
EPSS
VEX
Title
janmojzis tinyssh Ed25519 Signature crypto_sign_ed25519_tinyssh.c signature verification
Summary
A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/352358 | vdb-entry |
| https://vuldb.com/vuln/352358/cti | signaturepermissions-required |
| https://vuldb.com/submit/774687 | third-party-advisory |
| https://github.com/janmojzis/tinyssh/issues/101 | issue-tracking |
| https://github.com/janmojzis/tinyssh/pull/102 | issue-trackingpatch |
| https://github.com/janmojzis/tinyssh/issues/101#i… | exploitissue-tracking |
| https://github.com/janmojzis/tinyssh/commit/9c872… | patch |
| https://github.com/janmojzis/tinyssh/releases/tag… | patch |
| https://github.com/janmojzis/tinyssh/ | product |
Impacted products
Credits
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CVE-2026-4478 (GCVE-0-2026-4478)
Vulnerability from cvelistv5 – Published: 2026-03-20 07:02 – Updated: 2026-03-20 15:09
VLAI
EPSS
VEX
Title
Yi Technology YI Home Camera HTTP Firmware Update ipc signature verification
Summary
A vulnerability was identified in Yi Technology YI Home Camera 2 2.1.1_20171024151200. This impacts an unknown function of the file home/web/ipc of the component HTTP Firmware Update Handler. The manipulation leads to improper verification of cryptographic signature. The attack is possible to be carried out remotely. The complexity of an attack is rather high. The exploitability is said to be difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.351768 | vdb-entry |
| https://vuldb.com/?ctiid.351768 | signaturepermissions-required |
| https://vuldb.com/?submit.773162 | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Yi Technology | YI Home Camera |
Affected:
2 2.1.1_20171024151200
|
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CVE-2026-4115 (GCVE-0-2026-4115)
Vulnerability from cvelistv5 – Published: 2026-03-22 12:15 – Updated: 2026-05-25 01:42 Disputed X_Open Source
VLAI
EPSS
VEX
Title
PuTTY Ed25519 Signature ecc-ssh.c eddsa_verify signature verification
Summary
A vulnerability was detected in PuTTY 0.83. Affected is the function eddsa_verify of the file crypto/ecc-ssh.c of the component Ed25519 Signature Handler. The manipulation results in improper verification of cryptographic signature. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is told to be difficult. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. The patch is identified as af996b5ec27ab79bae3882071b9d6acf16044549. It is advisable to implement a patch to correct this issue. The vendor was contacted early, responded in a very professional manner and quickly released a patch for the affected product. However, at the moment there is no proof that this flaw might have any real-world impact.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.352429 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.352429 | signaturepermissions-required |
| https://vuldb.com/?submit.775576 | third-party-advisory |
| https://github.com/py-thok/putty-ed25519-malleabi… | related |
| https://www.chiark.greenend.org.uk/~sgtatham/putt… | related |
| https://github.com/py-thok/putty-ed25519-malleabi… | exploit |
| https://git.tartarus.org/?p=simon/putty.git;a=com… | patch |
| https://www.rfc-editor.org/rfc/rfc8032#section-8.4 | related |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
Credits
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CVE-2026-3706 (GCVE-0-2026-3706)
Vulnerability from cvelistv5 – Published: 2026-03-08 05:02 – Updated: 2026-04-22 18:54 Disputed X_Open Source
VLAI
EPSS
VEX
Title
mkj Dropbear S Range Check curve25519.c unpackneg signature verification
Summary
A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The actual existence of this vulnerability is currently in question. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch. The project maintainer explains: "Signature Malleability is not exploitable in SSH protocol. (...) [A] PoC doesn't exist for SSH implementation, but rather it's against the internal API."
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.349652 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.349652 | signaturepermissions-required |
| https://vuldb.com/?submit.765933 | third-party-advisory |
| https://github.com/mkj/dropbear/issues/406 | issue-tracking |
| https://github.com/mkj/dropbear/pull/407 | issue-trackingpatch |
| https://github.com/mkj/dropbear/commit/fdec3c90a1… | patch |
| https://github.com/str4d/ed25519-java/issues/82#i… | issue-tracking |
| https://github.com/mkj/dropbear/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| mkj | Dropbear |
Affected:
2025.0
Affected: 2025.1 Affected: 2025.2 Affected: 2025.3 Affected: 2025.4 Affected: 2025.5 Affected: 2025.6 Affected: 2025.7 Affected: 2025.8 Affected: 2025.9 Affected: 2025.10 Affected: 2025.11 Affected: 2025.12 Affected: 2025.13 Affected: 2025.14 Affected: 2025.15 Affected: 2025.16 Affected: 2025.17 Affected: 2025.18 Affected: 2025.19 Affected: 2025.20 Affected: 2025.21 Affected: 2025.22 Affected: 2025.23 Affected: 2025.24 Affected: 2025.25 Affected: 2025.26 Affected: 2025.27 Affected: 2025.28 Affected: 2025.29 Affected: 2025.30 Affected: 2025.31 Affected: 2025.32 Affected: 2025.33 Affected: 2025.34 Affected: 2025.35 Affected: 2025.36 Affected: 2025.37 Affected: 2025.38 Affected: 2025.39 Affected: 2025.40 Affected: 2025.41 Affected: 2025.42 Affected: 2025.43 Affected: 2025.44 Affected: 2025.45 Affected: 2025.46 Affected: 2025.47 Affected: 2025.48 Affected: 2025.49 Affected: 2025.50 Affected: 2025.51 Affected: 2025.52 Affected: 2025.53 Affected: 2025.54 Affected: 2025.55 Affected: 2025.56 Affected: 2025.57 Affected: 2025.58 Affected: 2025.59 Affected: 2025.60 Affected: 2025.61 Affected: 2025.62 Affected: 2025.63 Affected: 2025.64 Affected: 2025.65 Affected: 2025.66 Affected: 2025.67 Affected: 2025.68 Affected: 2025.69 Affected: 2025.70 Affected: 2025.71 Affected: 2025.72 Affected: 2025.73 Affected: 2025.74 Affected: 2025.75 Affected: 2025.76 Affected: 2025.77 Affected: 2025.78 Affected: 2025.79 Affected: 2025.80 Affected: 2025.81 Affected: 2025.82 Affected: 2025.83 Affected: 2025.84 Affected: 2025.85 Affected: 2025.86 Affected: 2025.87 Affected: 2025.88 Affected: 2025.89 |
Credits
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"value": "A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The actual existence of this vulnerability is currently in question. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch. The project maintainer explains: \"Signature Malleability is not exploitable in SSH protocol. (...) [A] PoC doesn\u0027t exist for SSH implementation, but rather it\u0027s against the internal API.\""
}
],
"metrics": [
{
"cvssV4_0": {
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"version": "4.0"
}
},
{
"cvssV3_1": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C",
"version": "3.1"
}
},
{
"cvssV3_0": {
"baseScore": 3.7,
"baseSeverity": "LOW",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C",
"version": "3.0"
}
},
{
"cvssV2_0": {
"baseScore": 2.6,
"vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C",
"version": "2.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-345",
"description": "Insufficient Verification of Data Authenticity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-16T05:39:00.731Z",
"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-349652 | mkj Dropbear S Range Check curve25519.c unpackneg signature verification",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/?id.349652"
},
{
"name": "VDB-349652 | CTI Indicators (IOB, IOC, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/?ctiid.349652"
},
{
"name": "Submit #765933 | GitHub Dropbear 2025.89 Improper Verification of Cryptographic Signature",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/?submit.765933"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/mkj/dropbear/issues/406"
},
{
"tags": [
"issue-tracking",
"patch"
],
"url": "https://github.com/mkj/dropbear/pull/407"
},
{
"tags": [
"patch"
],
"url": "https://github.com/mkj/dropbear/commit/fdec3c90a15447bd538641d85e5a3e3ac981011d"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/str4d/ed25519-java/issues/82#issue-727629226"
},
{
"tags": [
"product"
],
"url": "https://github.com/mkj/dropbear/"
}
],
"tags": [
"disputed",
"x_open-source"
],
"timeline": [
{
"lang": "en",
"time": "2026-03-07T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-03-07T01:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-03-16T06:42:50.000Z",
"value": "VulDB entry last update"
}
],
"title": "mkj Dropbear S Range Check curve25519.c unpackneg signature verification"
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-3706",
"datePublished": "2026-03-08T05:02:11.136Z",
"dateReserved": "2026-03-07T09:05:33.842Z",
"dateUpdated": "2026-04-22T18:54:11.224Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.