CVE-2026-119208
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 consume excessive time and memory when an application accesses the page count of a crafted encrypted PDF whose page tree declares a forged /Count value. Even after successful decryption, page-count retrieval trusts the unvalidated declared count instead of walking the page tree, allowing the attacker-controlled value to drive excessive work and memory use. 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: 2026-11-04 02:17
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-04 02:26 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/82b91951dc74496bb3efe6465434f041bb6a5e6b
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/4270
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-62m5-6wh8-28x7
References
- https://github.com/py-pdf/pypdf/commit/82b91951dc74496bb3efe6465434f041bb6a5e6b security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/4270 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-62m5-6wh8-28x7 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-04 02:26 UTC · record ↗