CVE WatchAug 6, 2026

CVE-2026-71488

league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines c

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 6, 2026 · Last modified: Aug 6, 2026 · CWE-407 · CWE-1050

EPSS · 30d

Not enough EPSS history yet.

Technical description

league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines can cause the parser to have quadratic time complexity when converting, because several parsing paths repeatedly rescan growing portions of a line to translate between character positions and byte positions, and the Autolink extension can also copy and validate the remaining line at every URL-like prefix, allowing an attacker who can submit Markdown for conversion to consume disproportionate CPU time with a comparatively small request. This issue is fixed in 2.9.0.

Official references

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CVE-2026-68750—

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