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BREW-PDFLY-CVE-2026-82398 (GHSA-FC8X-2RWW-XW9M)

Vulnerability from osv_homebrew – Published: 2026-09-03 09:47 – Updated: 2026-09-17 19:15 – Source website
VLAI
Summary
pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace
Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a call to read_until_whitespace with an input which does not have whitespace for a long time.

Patches

This has been fixed in pypdf==6.15.0.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3947.

Severity
6.9 (Medium)
CVSS:4.0/AV:N/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@6.16.2",
        "upstream_fixed_in": "6.15.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pdfly",
        "purl": "pkg:brew/pdfly"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.5.1_24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/pypdf@6.16.2",
        "name": "pypdf",
        "resource": "pypdf",
        "strategy": "registry",
        "subject_version": "6.16.2"
      }
    ]
  },
  "details": "### Impact\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a call to `read_until_whitespace` with an input which does not have whitespace for a long time.\n\n### Patches\nThis has been fixed in [pypdf==6.15.0](https://github.com/py-pdf/pypdf/releases/tag/6.15.0).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3947](https://github.com/py-pdf/pypdf/pull/3947).",
  "id": "BREW-pdfly-CVE-2026-82398",
  "modified": "2026-09-17T19:15:55Z",
  "published": "2026-09-03T09:47:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82398"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/3947"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.15.0"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/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: Inefficient handling of non-whitespace inputs in read_until_whitespace",
  "upstream": [
    "GHSA-fc8x-2rww-xw9m",
    "CVE-2026-82398",
    "PYSEC-2026-3912"
  ]
}



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