CVE-2025-55197
highpypdf 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 version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.
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: 2025-08-13 23:15
Modified: 2026-11-02 16:06
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 07:33 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 <6.0.0
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/pull/3430
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
References
- https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filter... security-advisories@github.com
- https://github.com/py-pdf/pypdf/issues/3429 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/3430 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.0.0 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:33 UTC · record ↗