جزئیات آسیب‌پذیری

Cpanel::JSON::XS versions from 4.51 before 4.80 for Perl allow quadratic CPU use by revalidating the remaining buffer per value in incr_parse. At the first non-ASCII byte in a string, the decoder validates UTF-8 from there to the end of its input. incr_parse decodes each buffered value with a fresh decoder, so every value revalidates the rest of the buffer, and doubling the input quadruples the work. A peer that sends about a megabyte of ordinary non-ASCII JSON in one read ties up the process for seconds of CPU time.

• https://github.com/rurban/Cpanel-JSON-XS/commit/384309f6a297384e69c851b5d64e1c421d9b2dcc.patch patch
• https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes release-notes