CVE-2026-27628
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
7.5
HIGH
CVSS 3.1
EPSS 0.06%
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.
How to fix CVE-2026-27628
To remediate CVE-2026-27628, upgrade the affected package to a fixed version below.
- —no fix listed
- —no fix listed
- —upgrade to 6.7.2 or later
Is CVE-2026-27628 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
- from 0
- from 0, < 6.7.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |