Public vulnerability disclosure

Open

CVE-2026-119206

pypdf: Possible long runtimes when retrieving page labels

publishedCWE-400

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.

Technical severity7.1 highCVSS 4.0 · CNA: GitHub_M

Published2026-10-29Source updated 2026-11-03

Collected2026-11-035 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

pypdf (pip): GitHub reports patched versions >= 6.21.3. Check the advisory for the affected release branch.

Source: GitHub GHSA-42gh-23hr-vphw

Fix

pypdf (PyPI): OSV reports a fixed version 6.21.3. Check the advisory for supported release branches.

Source: OSV GHSA-42gh-23hr-vphw

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
pypdf py-pdf	< 6.21.3 (affected)	CNA: GitHub_M
pypdf `pypdf` pip	< 6.21.3 (affected, GitHub advisory range)	GitHub GHSA-42gh-23hr-vphw
pypdf `pypdf` PyPI	1.0 (affected, PyPI) 1.1 (affected, PyPI) 1.10 (affected, PyPI) 1.11 (affected, PyPI) 1.12 (affected, PyPI) 1.13 (affected, PyPI) 1.2 (affected, PyPI) 1.3 (affected, PyPI) 1.4 (affected, PyPI) 1.5 (affected, PyPI) 1.6 (affected, PyPI) 1.7 (affected, PyPI) 1.8 (affected, PyPI) 1.9 (affected, PyPI) 3.1.0 (affected, PyPI) 3.10.0 (affected, PyPI) 3.11.0 (affected, PyPI) 3.11.1 (affected, PyPI) 3.12.0 (affected, PyPI) 3.12.1 (affected, PyPI) 3.12.2 (affected, PyPI) 3.13.0 (affected, PyPI) 3.14.0 (affected, PyPI) 3.15.0 (affected, PyPI) 3.15.1 (affected, PyPI) 3.15.2 (affected, PyPI) 3.15.3 (affected, PyPI) 3.15.4 (affected, PyPI) 3.15.5 (affected, PyPI) 3.16.0 (affected, PyPI) 3.16.1 (affected, PyPI) 3.16.2 (affected, PyPI) 3.16.3 (affected, PyPI) 3.16.4 (affected, PyPI) 3.17.0 (affected, PyPI) 3.17.1 (affected, PyPI) 3.17.2 (affected, PyPI) 3.17.3 (affected, PyPI) 3.17.4 (affected, PyPI) 3.2.0 (affected, PyPI) 3.2.1 (affected, PyPI) 3.3.0 (affected, PyPI) 3.4.0 (affected, PyPI) 3.4.1 (affected, PyPI) 3.5.0 (affected, PyPI) 3.5.1 (affected, PyPI) 3.5.2 (affected, PyPI) 3.6.0 (affected, PyPI) 3.7.0 (affected, PyPI) 3.7.1 (affected, PyPI) 3.8.0 (affected, PyPI) 3.8.1 (affected, PyPI) 3.9.0 (affected, PyPI) 3.9.1 (affected, PyPI) 4.0.0 (affected, PyPI) 4.0.1 (affected, PyPI) 4.0.2 (affected, PyPI) 4.1.0 (affected, PyPI) 4.2.0 (affected, PyPI) 4.3.0 (affected, PyPI) 4.3.1 (affected, PyPI) 5.0.0 (affected, PyPI) 5.0.1 (affected, PyPI) 5.1.0 (affected, PyPI) 5.2.0 (affected, PyPI) 5.3.0 (affected, PyPI) 5.3.1 (affected, PyPI) 5.4.0 (affected, PyPI) 5.5.0 (affected, PyPI) 5.6.0 (affected, PyPI) 5.6.1 (affected, PyPI) 5.7.0 (affected, PyPI) 5.8.0 (affected, PyPI) 5.9.0 (affected, PyPI) 6.0.0 (affected, PyPI) 6.1.0 (affected, PyPI) 6.1.1 (affected, PyPI) 6.1.2 (affected, PyPI) 6.1.3 (affected, PyPI) 6.10.0 (affected, PyPI) 6.10.1 (affected, PyPI) 6.10.2 (affected, PyPI) 6.11.0 (affected, PyPI) 6.12.0 (affected, PyPI) 6.12.1 (affected, PyPI) 6.12.2 (affected, PyPI) 6.13.0 (affected, PyPI) 6.13.1 (affected, PyPI) 6.13.2 (affected, PyPI) 6.13.3 (affected, PyPI) 6.14.0 (affected, PyPI) 6.14.1 (affected, PyPI) 6.14.2 (affected, PyPI) 6.15.0 (affected, PyPI) 6.16.0 (affected, PyPI) 6.16.1 (affected, PyPI) 6.16.2 (affected, PyPI) 6.17.0 (affected, PyPI) 6.18.0 (affected, PyPI) 6.18.1 (affected, PyPI) 6.19.0 (affected, PyPI) 6.2.0 (affected, PyPI) 6.20.0 (affected, PyPI) 6.20.1 (affected, PyPI) 6.21.0 (affected, PyPI) 6.21.1 (affected, PyPI) 6.21.2 (affected, PyPI) 6.3.0 (affected, PyPI) 6.4.0 (affected, PyPI) 6.4.1 (affected, PyPI) 6.4.2 (affected, PyPI) 6.5.0 (affected, PyPI) 6.6.0 (affected, PyPI) 6.6.1 (affected, PyPI) 6.6.2 (affected, PyPI) 6.7.0 (affected, PyPI) 6.7.1 (affected, PyPI) 6.7.2 (affected, PyPI) 6.7.3 (affected, PyPI) 6.7.4 (affected, PyPI) 6.7.5 (affected, PyPI) 6.8.0 (affected, PyPI) 6.9.0 (affected, PyPI) 6.9.1 (affected, PyPI) 6.9.2 (affected, PyPI) Ecosystem version events: introduced 0; fixed 6.21.3 Source events (ECOSYSTEM) `[ { "introduced": "0" }, { "fixed": "6.21.3" } ]` Other versions: unaffected	OSV GHSA-42gh-23hr-vphw

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.21.3",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 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`	CNA: GitHub_M
4.0 / 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`	NVD: [email protected]
3.1 / 5.5 medium	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphwCNA: GitHub_M · x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4251CNA: GitHub_M · x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03eCNA: GitHub_M · x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.21.3CNA: GitHub_M · x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e[email protected] · Patch
https://github.com/py-pdf/pypdf/pull/4251[email protected] · Patch
https://github.com/py-pdf/pypdf/releases/tag/6.21.3[email protected] · Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw[email protected] · Patch, Vendor Advisory
https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphwGitHub Security Advisories · advisory
https://github.com/advisories/GHSA-42gh-23hr-vphwOSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-42gh-23hr-vphwOSV / GitHub Security Advisories · osv

Prioritization

CISA known exploited vulnerabilities

No KEV listing in collected sources. This does not establish that exploitation is absent.

EPSS

0.22% estimated probability of exploitation in the next 30 days; percentile 12.70.
Assessed 2026-11-03 by FIRST.

SSVC

Exploitation: none
Automatable: yes
Technical impact: partial

ADP: CISA-ADP · 2026-11-03

Provenance

CNA: GitHub_M
Source updated 2026-11-03
Retrieved 2026-11-03

NVD
Source updated 2026-11-03
Retrieved 2026-11-03

GitHub Security Advisories
Source updated 2026-10-29
Retrieved 2026-11-03

OSV / GitHub Security Advisories
Source updated 2026-10-30
Retrieved 2026-11-02

FIRST EPSS
Source updated Not reported
Retrieved 2026-11-03

Disclosure revision
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