CVE-2026-27025 — pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory co…
Published: 2026-02-20 · CVSS: 6.9 · CVSS 4.0
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction. This vulnerability is fixed in 6.7.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7