BREW-PDFLY-CVE-2026-48156 (GHSA-248M-82V9-Q6G6)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:25 – Updated: 2026-10-13 09:45 – Source website
VLAI
Summary
pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams
Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values.

Patches

This has been fixed in pypdf==6.12.0.

Workarounds

If developers are unable to upgrade their apps immediately, they should consider applying the changes from PR #3791.

Severity
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.1 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "pypdf",
        "resource_purl": "pkg:pypi/pypdf@6.20.0",
        "upstream_fixed_in": "6.12.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pdfly",
        "purl": "pkg:brew/pdfly"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.5.1_20"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/pypdf@6.20.0",
        "name": "pypdf",
        "resource": "pypdf",
        "strategy": "registry",
        "subject_version": "6.20.0"
      }
    ]
  },
  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with `/W [0 0 0]` values and large `/Size` values.\n\n### Patches\n\nThis has been fixed in [pypdf==6.12.0](https://github.com/py-pdf/pypdf/releases/tag/6.12.0).\n\n### Workarounds\n\nIf developers are unable to upgrade their apps immediately, they should consider applying the changes from PR [#3791](https://github.com/py-pdf/pypdf/pull/3791).",
  "id": "BREW-pdfly-CVE-2026-48156",
  "modified": "2026-10-13T09:45:11Z",
  "published": "2026-08-13T17:25:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48156"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/3791"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams",
  "upstream": [
    "GHSA-248m-82v9-q6g6",
    "CVE-2026-48156",
    "PYSEC-2026-3004"
  ]
}



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