PYSEC-2026-2561

Vulnerability from pysec - Published: 2026-07-13 14:36 - Updated: 2026-07-13 16:04
VLAI
Details

Denial of service in SitemapLoader Document Loader in the langchain-community package, affecting versions below 0.2.5. The parse_sitemap method, responsible for parsing sitemaps and extracting URLs, lacks a mechanism to prevent infinite recursion when a sitemap URL refers to the current sitemap itself. This oversight allows for the possibility of an infinite loop, leading to a crash by exceeding the maximum recursion depth in Python. This vulnerability can be exploited to occupy server socket/port resources and crash the Python process, impacting the availability of services relying on this functionality.

Severity
4.2 (Medium)
CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Impacted products
Name purl
langchain-community pkg:pypi/langchain-community
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "langchain-community",
        "purl": "pkg:pypi/langchain-community"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.1",
        "0.0.10",
        "0.0.11",
        "0.0.12",
        "0.0.13",
        "0.0.14",
        "0.0.15",
        "0.0.16",
        "0.0.17",
        "0.0.18",
        "0.0.19",
        "0.0.1rc1",
        "0.0.1rc2",
        "0.0.2",
        "0.0.20",
        "0.0.21",
        "0.0.22",
        "0.0.23",
        "0.0.24",
        "0.0.25",
        "0.0.26",
        "0.0.27",
        "0.0.28",
        "0.0.29",
        "0.0.3",
        "0.0.30",
        "0.0.31",
        "0.0.32",
        "0.0.33",
        "0.0.34",
        "0.0.35",
        "0.0.36",
        "0.0.37",
        "0.0.38",
        "0.0.4",
        "0.0.5",
        "0.0.6",
        "0.0.7",
        "0.0.8",
        "0.0.9",
        "0.2.0",
        "0.2.0rc1",
        "0.2.1",
        "0.2.2",
        "0.2.3",
        "0.2.4"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-2965",
    "GHSA-3hjh-jh2h-vrg6"
  ],
  "details": "Denial of service in `SitemapLoader` Document Loader in the `langchain-community` package, affecting versions below 0.2.5. The `parse_sitemap` method, responsible for parsing sitemaps and extracting URLs, lacks a mechanism to prevent infinite recursion when a sitemap URL refers to the current sitemap itself. This oversight allows for the possibility of an infinite loop, leading to a crash by exceeding the maximum recursion depth in Python. This vulnerability can be exploited to occupy server socket/port resources and crash the Python process, impacting the availability of services relying on this functionality.",
  "id": "PYSEC-2026-2561",
  "modified": "2026-07-13T16:04:29.534545Z",
  "published": "2026-07-13T14:36:32.210054Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-2965"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchain/pull/22903"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchain/commit/73c42306745b0831aa6fe7fe4eeb70d2c2d87a82"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langchain/commit/9a877c7adbd06f90a2518152f65b562bd90487cc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/langchain-ai/langchain"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/langchain/PYSEC-2024-118.yaml"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/90b0776d-9fa6-4841-aac4-09fde5918cae"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/langchain-community"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-3hjh-jh2h-vrg6"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Denial of service in langchain-community"
}



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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.


Detection rules are retrieved from Rulezet.