PT-2026-86799
CVE-2026-86433
·
Published
2026-09-07
·
Updated
2026-09-07
Description by
CVSS 4.0
8.7
HighMetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Name of the Vulnerable Software and Affected Versions
commonmark versions 1.5.0 through 2.8.3
Description
A denial of service issue exists in the Attributes extension. The
findTargetAndDirection() function in AttributesListener performs quadratic-time sibling list scanning. Unauthenticated attackers can exploit this by submitting approximately 32 KB of repeated attribute blocks, causing the parsing process to exceed 5 seconds and exhaust server resources.Recommendations
Update commonmark to version 2.8.4 or later.
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