CVE-2026-119209
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 memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. 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:L/UI:N/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: 2026-11-02 16:06
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 07:35 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/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/4269
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc
References
- https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/4269 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-x3rh-gjgm-fmqc security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:35 UTC · record ↗