Loop with Unreachable Exit Condition ('Infinite Loop') Affecting pypdf package, versions <6.21.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published23 Oct 2026
- disclosed21 Oct 2026
Introduced: 21 Oct 2026
NewCVE-2026-113794 (opens in a new tab)How to fix?
Upgrade Debian:unstable pypdf to version 6.21.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream pypdf package and not the pypdf package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.
References
- https://security-tracker.debian.org/tracker/CVE-2026-113794
- https://github.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58
- https://github.com/py-pdf/pypdf/issues/4169
- https://github.com/py-pdf/pypdf/pull/4170
- https://github.com/py-pdf/pypdf/releases/tag/6.20.0
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3