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.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Upgrade to Cpanel-JSON-XS 4.80 or later.
Tracking
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Thu, 29 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
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Mon, 19 Oct 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Rurban
Rurban cpanel::json::xs |
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| Vendors & Products |
Rurban
Rurban cpanel::json::xs |
Mon, 19 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | 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 | |
| Weaknesses | CWE-407 | |
| References |
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-10-29T17:18:17.844Z
Reserved: 2026-10-14T13:27:36.845Z
Link: CVE-2026-110688
Updated: 2026-10-29T17:17:48.243Z
Status : Awaiting Analysis
Published: 2026-10-19T19:17:22.420
Modified: 2026-10-29T18:17:22.727
Link: CVE-2026-110688
No data.
OpenCVE Enrichment
Updated: 2026-10-29T21:45:15Z