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4 vulnerabilities found for python-ecdsa by tlsfuzzer

CVE-2026-33936 (GCVE-0-2026-33936)

Vulnerability from nvd – Published: 2026-03-27 22:08 – Updated: 2026-03-27 22:08
VLAI?
Title
python-ecdsa: Denial of Service via improper DER length validation in crafted private keys
Summary
The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Prior to version 0.19.2, an issue in the low-level DER parsing functions can cause unexpected exceptions to be raised from the public API functions. `ecdsa.der.remove_octet_string()` accepts truncated DER where the encoded length exceeds the available buffer. For example, an OCTET STRING that declares a length of 4096 bytes but provides only 3 bytes is parsed successfully instead of being rejected. Because of that, a crafted DER input can cause `SigningKey.from_der()` to raise an internal exception (`IndexError: index out of bounds on dimension 1`) rather than cleanly rejecting malformed DER (e.g., raising `UnexpectedDER` or `ValueError`). Applications that parse untrusted DER private keys may crash if they do not handle unexpected exceptions, resulting in a denial of service. Version 0.19.2 patches the issue.
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-20 - Improper Input Validation
  • CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
Impacted products
Vendor Product Version
tlsfuzzer python-ecdsa Affected: < 0.19.2
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CVE-2024-23342 (GCVE-0-2024-23342)

Vulnerability from nvd – Published: 2024-01-22 23:09 – Updated: 2025-05-30 14:21
VLAI?
Title
python-ecdsa vulnerable to Minerva attack on P-256
Summary
The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Versions 0.18.0 and prior are vulnerable to the Minerva attack. As of time of publication, no known patched version exists.
Severity ?
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-208 - Observable Timing Discrepancy
  • CWE-385 - Covert Timing Channel
Assigner
References
Impacted products
Vendor Product Version
tlsfuzzer python-ecdsa Affected: <= 0.18.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-33936 (GCVE-0-2026-33936)

Vulnerability from cvelistv5 – Published: 2026-03-27 22:08 – Updated: 2026-03-27 22:08
VLAI?
Title
python-ecdsa: Denial of Service via improper DER length validation in crafted private keys
Summary
The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Prior to version 0.19.2, an issue in the low-level DER parsing functions can cause unexpected exceptions to be raised from the public API functions. `ecdsa.der.remove_octet_string()` accepts truncated DER where the encoded length exceeds the available buffer. For example, an OCTET STRING that declares a length of 4096 bytes but provides only 3 bytes is parsed successfully instead of being rejected. Because of that, a crafted DER input can cause `SigningKey.from_der()` to raise an internal exception (`IndexError: index out of bounds on dimension 1`) rather than cleanly rejecting malformed DER (e.g., raising `UnexpectedDER` or `ValueError`). Applications that parse untrusted DER private keys may crash if they do not handle unexpected exceptions, resulting in a denial of service. Version 0.19.2 patches the issue.
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-20 - Improper Input Validation
  • CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
Impacted products
Vendor Product Version
tlsfuzzer python-ecdsa Affected: < 0.19.2
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2024-23342 (GCVE-0-2024-23342)

Vulnerability from cvelistv5 – Published: 2024-01-22 23:09 – Updated: 2025-05-30 14:21
VLAI?
Title
python-ecdsa vulnerable to Minerva attack on P-256
Summary
The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Versions 0.18.0 and prior are vulnerable to the Minerva attack. As of time of publication, no known patched version exists.
Severity ?
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-203 - Observable Discrepancy
  • CWE-208 - Observable Timing Discrepancy
  • CWE-385 - Covert Timing Channel
Assigner
References
Impacted products
Vendor Product Version
tlsfuzzer python-ecdsa Affected: <= 0.18.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-203",
              "description": "CWE-203: Observable Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-208",
              "description": "CWE-208: Observable Timing Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-385",
              "description": "CWE-385: Covert Timing Channel",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-22T23:09:35.775Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tlsfuzzer/python-ecdsa/security/advisories/GHSA-wj6h-64fc-37mp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tlsfuzzer/python-ecdsa/security/advisories/GHSA-wj6h-64fc-37mp"
        },
        {
          "name": "https://github.com/tlsfuzzer/python-ecdsa/blob/master/SECURITY.md",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tlsfuzzer/python-ecdsa/blob/master/SECURITY.md"
        },
        {
          "name": "https://minerva.crocs.fi.muni.cz/",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://minerva.crocs.fi.muni.cz/"
        },
        {
          "name": "https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/"
        }
      ],
      "source": {
        "advisory": "GHSA-wj6h-64fc-37mp",
        "discovery": "UNKNOWN"
      },
      "title": "python-ecdsa vulnerable to Minerva attack on P-256"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-23342",
    "datePublished": "2024-01-22T23:09:35.775Z",
    "dateReserved": "2024-01-15T15:19:19.444Z",
    "dateUpdated": "2025-05-30T14:21:45.651Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}