CVE-2026-84311
lowpypdf is a free and open-source pure-python PDF library.
Vendor / product: Pypdf Project — pypdf
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.
CVSS
3.3
3.3 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-01 21:18
Modified: 2026-10-05 17:42
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:50 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
pypdf_project / pypdf <6.16.1
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/d91ab705fd81ed1a9cec175c6958600dea1a4942
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/3966
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2
References
- https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/3966 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.16.1 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗