An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large /Size values or object streams with wrong large /N values.
This has been fixed in pypdf==6.10.1.
If you cannot upgrade yet, consider applying the changes from PR #3733.
1.01.11.101.111.121.131.21.31.41.5+89 more6.10.1Exploitability
AV:LAC:LAT:NPR:NUI:PVulnerable System
VC:NVI:NVA:LSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N