PYSEC-2025-185

Vulnerability from pysec - Published: 2025-12-17 16:16 - Updated: 2026-05-21 14:54
VLAI
Details

In python-jose 3.3.0 (specifically jwe.decrypt), a vulnerability allows an attacker to cause a Denial-of-Service (DoS) condition by crafting a malicious JSON Web Encryption (JWE) token with an exceptionally high compression ratio. When this token is processed by the server, it results in significant memory allocation and processing time during decompression.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Impacted products
Name purl
python-jose pkg:pypi/python-jose
Aliases
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "python-jose",
        "purl": "pkg:pypi/python-jose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.1",
        "0.1.2",
        "0.1.3",
        "0.1.4",
        "0.1.5",
        "0.1.6",
        "0.1.7",
        "0.1.8",
        "0.2.0",
        "0.3.0",
        "0.4.0",
        "0.5.0",
        "0.5.1",
        "0.5.2",
        "0.5.3",
        "0.5.4",
        "0.5.5",
        "0.5.6",
        "0.6.1",
        "0.6.2",
        "0.7.0",
        "1.0.0",
        "1.1.0",
        "1.2.0",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.4.0",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "3.0.0",
        "3.0.1",
        "3.1.0",
        "3.2.0",
        "3.3.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-29370"
  ],
  "details": "In python-jose 3.3.0 (specifically jwe.decrypt), a vulnerability allows an attacker to cause a Denial-of-Service (DoS) condition by crafting a malicious JSON Web Encryption (JWE) token with an exceptionally high compression ratio. When this token is processed by the server, it results in significant memory allocation and processing time during decompression.",
  "id": "PYSEC-2025-185",
  "modified": "2026-05-21T14:54:42.119197Z",
  "published": "2025-12-17T16:16:04.457Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/mpdavis/python-jose/issues/344"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}


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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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