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    3 vulnerabilities by tlsfuzzer

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

    Vulnerability from cvelistv5 – Published: 2026-03-27 22:08 – Updated: 2026-04-01 13:44
    VLAI KEVintel KEV
    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
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    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
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    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-2020-26263 (GCVE-0-2020-26263)

    Vulnerability from cvelistv5 – Published: 2020-12-21 16:55 – Updated: 2024-08-04 15:56
    VLAI
    Title
    RSA vulnerability in tslite-ng
    Summary
    tlslite-ng is an open source python library that implements SSL and TLS cryptographic protocols. In tlslite-ng before versions 0.7.6 and 0.8.0-alpha39, the code that performs decryption and padding check in RSA PKCS#1 v1.5 decryption is data dependant. In particular, the code has multiple ways in which it leaks information about the decrypted ciphertext. It aborts as soon as the plaintext doesn't start with 0x00, 0x02. All TLS servers that enable RSA key exchange as well as applications that use the RSA decryption API directly are vulnerable. This is patched in versions 0.7.6 and 0.8.0-alpha39. Note: the patches depend on Python processing the individual bytes in side-channel free manner, this is known to not the case (see reference). As such, users that require side-channel resistance are recommended to use different TLS implementations, as stated in the security policy of tlslite-ng.
    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-326 - Inadequate Encryption Strength
    Assigner
    References
    Impacted products
    Vendor Product Version
    tlsfuzzer tlslite-ng Affected: < 0.7.6
    Affected: >= 0.8.0-alpha1, < 0.8.0-alpha39
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-326 Inadequate Encryption Strength"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/tlsfuzzer/tlslite-ng/security/advisories/GHSA-wvcv-832q-fjg7",
              "refsource": "CONFIRM",
              "url": "https://github.com/tlsfuzzer/tlslite-ng/security/advisories/GHSA-wvcv-832q-fjg7"
            },
            {
              "name": "https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/",
              "refsource": "MISC",
              "url": "https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-python/"
            },
            {
              "name": "https://github.com/tlsfuzzer/tlslite-ng/pull/438",
              "refsource": "MISC",
              "url": "https://github.com/tlsfuzzer/tlslite-ng/pull/438"
            },
            {
              "name": "https://github.com/tlsfuzzer/tlslite-ng/pull/439",
              "refsource": "MISC",
              "url": "https://github.com/tlsfuzzer/tlslite-ng/pull/439"
            },
            {
              "name": "https://pypi.org/project/tlslite-ng/",
              "refsource": "MISC",
              "url": "https://pypi.org/project/tlslite-ng/"
            },
            {
              "name": "https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba59d8bd5cb3ba15edc42edf54b368",
              "refsource": "MISC",
              "url": "https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba59d8bd5cb3ba15edc42edf54b368"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-wvcv-832q-fjg7",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-26263",
    "datePublished": "2020-12-21T16:55:18.000Z",
    "dateReserved": "2020-10-01T00:00:00.000Z",
    "dateUpdated": "2024-08-04T15:56:03.863Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}