CVE-2026-27888 — pypdf: Manipulated FlateDecode XFA streams can exhaust RAM
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 req…
Published: 2026-02-26 · CVSS: 6.6 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7