Inefficient Algorithmic Complexity Affecting league/commonmark package, versions >=2.0.0, <2.10.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PHP-LEAGUECOMMONMARK-20875274
- published13 Oct 2026
- disclosed30 Sept 2026
- creditmanus-pi
Introduced: 30 Sep 2026
NewCVE-2026-105830 (opens in a new tab)How to fix?
Upgrade league/commonmark to version 2.10.2 or higher.
Overview
league/commonmark is a PHP-based Markdown parser which supports the full CommonMark spec. It is based on the CommonMark JS reference implementation.
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the TableStartParser::tryStart function. An attacker can exhaust CPU resources and disrupt service availability by submitting a large paragraph of pipe-free, blank-line-free lines that do not begin with a letter to any service that processes untrusted Markdown with the relevant converter or configuration.