pypdf can exhaust RAM via manipulated LZWDecode streams

ImpactAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. PatchesThis has been fixed in pypdf==6.1.3. WorkaroundsIf you cannot upgrade yet, consider applying the changes from PR...

CVE-2026-27888

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...