CVE-2026-27888 · Severity: high · CVSS 7.5 · Published 2026-02-26
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-27888 being exploited in the wild.
How severe is CVE-2026-27888?
High severity, with a CVSS score of 7.5, published 26 February 2026.
Which products and versions are affected?
pypdf (PyPI) ECOSYSTEM:introduced=0,fixed=6.7.3.
Is there a fix for CVE-2026-27888?
Yes. pypdf (PyPI): upgrade to 6.7.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-27888?
Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.