CVE-2026-27888
pypdf: Manipulated FlateDecode XFA streams can exhaust RAM
7.5
HIGH
CVSS 3.1
EPSS 0.06%
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.
How to fix CVE-2026-27888
To remediate CVE-2026-27888, upgrade the affected package to a fixed version below.
- —no fix listed
- —no fix listed
- —upgrade to 6.7.3 or later
Is CVE-2026-27888 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, < 6.7.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 |