HOME VULNERABILITIESCVE-2026-59870

HIGH

CVE-2026-59870

CWE-407Published: July 8, 2026· Updated: Jul 10, 2026

7.5

CVSS v3.1

EPSS:0.29%probability of exploitation in 30 daysPercentile:20.9th

Official Description

js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.1, YAML11_SCHEMA support for the !!omap tag in src/tag/sequence/omap.ts uses omapTag.addItem() to perform a linear duplicate-key scan on every insertion, causing O(n^2) CPU consumption when yaml.load() parses a crafted ordered-map document. This issue is fixed in version 5.2.1.

Technical Analysis

CVE-2026-59870 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

nodeca1 product(s)

js-yaml

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefe

ADVISORYhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm

ADVISORYhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvm

All References (4)

→

https://github.com/nodeca/js-yaml/commit/39f3211a2f01b3c6982710cf21434ab7060acefePatch

→

https://github.com/nodeca/js-yaml/releases/tag/5.2.1Release Notes

→

https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvmExploit · Vendor Advisory

→

https://github.com/nodeca/js-yaml/security/advisories/GHSA-724g-mxrg-4qvmExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-59870

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-407

CISA KEVNo

EPSS (30d)0.29%

Affected1 vendor(s)

PublishedJul 8, 2026

Related CVEs (CWE-407)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2026-59870 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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