CVE-2024-58382Network attack vector

Service interruption via quadratic Markdown parsing

Published Sep 9, 2026 · Updated Sep 9, 2026

Inefficient parsing in The PHP League CommonMark before 2.6.0 allows remote attackers to interrupt service with crafted Markdown. The parser permits unbounded delimiter processing, table-cell autocompletion, URL subdomain parsing, and expanded reference-link growth on attacker-controlled lines. Reachability requires an embedding application to pass untrusted Markdown to the library; parallel requests can exhaust CPU resources or PHP-FPM workers and deny service to legitimate users.

CVSS severity8.7
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inefficient parsing in The PHP League CommonMark before 2.6.0 allows remote attackers to interrupt service with crafted Markdown. The parser permits unbounded delimiter processing, table-cell autocompletion, URL subdomain parsing, and expanded reference-link growth on attacker-controlled lines. Reachability requires an embedding application to pass untrusted Markdown to the library; parallel requests can exhaust CPU resources or PHP-FPM workers and deny service to legitimate users.

The record

CVE
CVE-2024-58382
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
The PHP League
Product
CommonMark
Classifications
CWE-407, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The PHP League · CommonMarkversion=0 <2.6.0

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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