CVE-2026-119203
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 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.
CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 <6.21.4
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/06593f993789a4b573dd955730c1a7051128bb2a
Patch / mitigation: https://github.com/py-pdf/pypdf/pull/4289
Patch / mitigation: https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5
References
- https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a security-advisories@github.com
- https://github.com/py-pdf/pypdf/pull/4289 security-advisories@github.com
- https://github.com/py-pdf/pypdf/releases/tag/6.21.4 security-advisories@github.com
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5 security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:35 UTC · record ↗