CVE-2026-73643Public exploitNetwork attack vector

Denial of service via recursive flow-pair reparsing

Published Aug 13, 2026 · Updated Aug 13, 2026

Algorithmic-complexity denial of service in Nodeca js-yaml 5.0.0 through 5.2.1 allows remote attackers to stall a process with crafted YAML. readFlowCollection restores parser state and calls parseNode again when a flow-sequence entry becomes a key-value pair, doubling work at each nested level. Any application that passes untrusted input to load() or loadAll() is exposed; default parsing options suffice to monopolize one CPU and block the Node.js event loop.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic-complexity denial of service in Nodeca js-yaml 5.0.0 through 5.2.1 allows remote attackers to stall a process with crafted YAML. readFlowCollection restores parser state and calls parseNode again when a flow-sequence entry becomes a key-value pair, doubling work at each nested level. Any application that passes untrusted input to load() or loadAll() is exposed; default parsing options suffice to monopolize one CPU and block the Node.js event loop.

The record

CVE
CVE-2026-73643
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Nodeca
Product
js-yaml
Classifications
CWE-407, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=>= 5.0.0, < 5.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nodeca · js-yamlversion=>= 5.0.0, < 5.2.2

Published CVSS scores

7.5GitHubCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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