Vulnerability-Lookup

GHSA-JR96-GVGH-J3R4

Vulnerability from github – Published: 2026-10-23 20:54 – Updated: 2026-10-23 20:54

Summary

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4240.

Notes

This is a follow-up to https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v, which had the side-effect of still loading the whole stream again despite the cache being present.

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pypdf"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.21.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-115585"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-407"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-23T20:54:27Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.\n\n### Patches\n\nThis has been fixed in [pypdf==6.21.2](https://github.com/py-pdf/pypdf/releases/tag/6.21.2).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#4240](https://github.com/py-pdf/pypdf/pull/4240).\n\n### Notes\n\nThis is a follow-up to https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v, which had the side-effect of still loading the whole stream again despite the cache being present.",
  "id": "GHSA-jr96-gvgh-j3r4",
  "modified": "2026-10-23T20:54:27Z",
  "published": "2026-10-23T20:54:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/4240"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.21.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)"
}

BREW-PDFALYZER-CVE-2026-115585 (GHSA-JR96-GVGH-J3R4)

Vulnerability from osv_homebrew – Published: 2026-10-24 11:10 – Updated: 2026-10-24 11:10 – Source website

Summary

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.

Patches

This has been fixed in pypdf==6.21.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4240.

Notes

This is a follow-up to https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v, which had the side-effect of still loading the whole stream again despite the cache being present.

Severity

7.1 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

URL

Type

	https://github.com/py-pdf/pypdf/security/advisori…	WEB
	https://github.com/py-pdf/pypdf/pull/4240	WEB
	https://github.com/py-pdf/pypdf/commit/68a0e5046c…	WEB
	https://github.com/py-pdf/pypdf	PACKAGE
	https://github.com/py-pdf/pypdf/releases/tag/6.21.2	WEB

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": null,
        "range_state": "affected",
        "resource": "pypdf",
        "resource_purl": "pkg:pypi/pypdf@6.6.0",
        "upstream_fixed_in": "6.21.2"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "pdfalyzer",
        "purl": "pkg:brew/pdfalyzer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.16.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/pypdf@6.6.0",
        "name": "pypdf",
        "resource": "pypdf",
        "strategy": "registry",
        "subject_version": "6.6.0"
      }
    ]
  },
  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams.\n\n### Patches\n\nThis has been fixed in [pypdf==6.21.2](https://github.com/py-pdf/pypdf/releases/tag/6.21.2).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#4240](https://github.com/py-pdf/pypdf/pull/4240).\n\n### Notes\n\nThis is a follow-up to https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v, which had the side-effect of still loading the whole stream again despite the cache being present.",
  "id": "BREW-pdfalyzer-CVE-2026-115585",
  "modified": "2026-10-24T11:10:18Z",
  "published": "2026-10-24T11:10:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/pull/4240"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/py-pdf/pypdf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.21.2"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)",
  "upstream": [
    "GHSA-jr96-gvgh-j3r4",
    "CVE-2026-115585"
  ]
}

CVE-2026-115585 (GCVE-0-2026-115585)

Vulnerability from cvelistv5 – Published: 2026-10-23 19:31 – Updated: 2026-10-23 19:31

Title

pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)

Summary

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-407 - Inefficient Algorithmic Complexity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7761 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/py-pdf/pypdf/security/advisori…	x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4240	x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/68a0e5046c…	x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.21.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
py-pdf	pypdf	Affected: < 6.21.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "pypdf",
          "vendor": "py-pdf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.21.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T19:31:52.598Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jr96-gvgh-j3r4"
        },
        {
          "name": "https://github.com/py-pdf/pypdf/pull/4240",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/py-pdf/pypdf/pull/4240"
        },
        {
          "name": "https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/py-pdf/pypdf/commit/68a0e5046cc9e14a6c24a21a713f3c7fbde18b4b"
        },
        {
          "name": "https://github.com/py-pdf/pypdf/releases/tag/6.21.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/py-pdf/pypdf/releases/tag/6.21.2"
        }
      ],
      "source": {
        "advisory": "GHSA-jr96-gvgh-j3r4",
        "discovery": "UNKNOWN"
      },
      "title": "pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-115585",
    "datePublished": "2026-10-23T19:31:52.598Z",
    "dateReserved": "2026-10-22T22:53:15.238Z",
    "dateUpdated": "2026-10-23T19:31:52.598Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-JR96-GVGH-J3R4

Impact

Patches

Workarounds

Notes

BREW-PDFALYZER-CVE-2026-115585 (GHSA-JR96-GVGH-J3R4)

Impact

Patches

Workarounds

Notes

CVE-2026-115585 (GCVE-0-2026-115585)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour