PYSEC-2026-1595

Vulnerability from pysec - Published: 2026-07-07 11:45 - Updated: 2026-07-07 17:24
VLAI
Details

A flaw was found in m2crypto. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Impacted products
Name purl
m2crypto pkg:pypi/m2crypto
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "m2crypto",
        "purl": "pkg:pypi/m2crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.40.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11",
        "0.13",
        "0.15",
        "0.16",
        "0.17",
        "0.18",
        "0.18.1",
        "0.18.2",
        "0.19",
        "0.19.1",
        "0.20",
        "0.20.1",
        "0.20.2",
        "0.20beta1",
        "0.21",
        "0.21.1",
        "0.22.3",
        "0.22.4",
        "0.22.5",
        "0.23.0",
        "0.24.0",
        "0.25.0",
        "0.25.1",
        "0.26.0",
        "0.26.2",
        "0.26.3",
        "0.26.4",
        "0.27.0",
        "0.28.0",
        "0.28.1",
        "0.28.2",
        "0.29.0",
        "0.30.0",
        "0.30.1",
        "0.31.0",
        "0.32.0",
        "0.33.0",
        "0.34.0",
        "0.35.0",
        "0.35.1",
        "0.35.2",
        "0.36.0",
        "0.37.0",
        "0.37.1",
        "0.38.0",
        "0.39.0",
        "0.40.0",
        "0.40.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-50781",
    "GHSA-944j-8ch6-rf6x"
  ],
  "details": "A flaw was found in m2crypto. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.",
  "id": "PYSEC-2026-1595",
  "modified": "2026-07-07T17:24:36.761903Z",
  "published": "2026-07-07T11:45:31.910766Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-50781"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2023-50781"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2254426"
    },
    {
      "type": "PACKAGE",
      "url": "https://gitlab.com/m2crypto/m2crypto"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/m2crypto/m2crypto/-/issues/342"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/m2crypto"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-944j-8ch6-rf6x"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "m2crypto Bleichenbacher timing attack - incomplete fix for CVE-2020-25657"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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