CVE-2026-119206
mediumpypdf is a free and open-source pure-python PDF library.
Vendor / product: Py-pdf — pypdf
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.
CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-10-29 21:17
Modified: 2026-11-03 17:18
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 17:20 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
py-pdf / pypdf <6.21.3
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/4251
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw
References
- https://github.com/py-pdf/pypdf/commit/b891fef37000cd86baa6e9848a3387d080b3b03e security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/4251 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-42gh-23hr-vphw security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 17:20 UTC · record ↗