CVE-2026-119203

high

Description

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.

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5

https://github.com/py-pdf/pypdf/releases/tag/6.21.4

https://github.com/py-pdf/pypdf/pull/4289

https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-113374

Details

Source: Mitre, NVD

Published: 2026-10-29

Updated: 2026-10-30

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 7.1

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00304