CVE-2026-102997
highpypdf 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 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-30 21:17
Modified: 2026-10-05 15:07
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 06:56 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 <6.18.1
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/d9d38cf99b115deb562d3b68f36c33027bc04f79
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/4073
References
- https://github.com/py-pdf/pypdf/commit/d9d38cf99b115deb562d3b68f36c33027bc04f79 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/4073 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗