CVE-2026-27025
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 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. This vulnerability is fixed in 6.7.1.
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: 2026-02-20 22:16
Modified: 2026-11-02 16:06
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 07:34 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 <6.7.1
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/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/3646
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3
References
- https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2 security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/3646 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗