CVE-2026-57204 — pypdf: Missing stream length values ignore defined limits
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which …
Published: 2026-06-30 · CVSS: 6.9 · CVSS 4.0
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7