CVE-2026-45822Network attack vector

Denial of service via super-linear percent decoding

Published Jun 30, 2026 · Updated Jun 30, 2026

Denial of service in Sam Verschueren decode-uri-component 0.1.0 through 0.4.1 allows remote attackers to block Node.js event loops. After decodeURIComponent rejects malformed input, decode() repeatedly splits percent tokens and recursively calls decodeComponents(), causing super-linear CPU work. Attacker-controlled encoded strings must reach the library through a consuming application; successful requests block that application's event loop and interrupt service.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Sam Verschueren decode-uri-component 0.1.0 through 0.4.1 allows remote attackers to block Node.js event loops. After decodeURIComponent rejects malformed input, decode() repeatedly splits percent tokens and recursively calls decodeComponents(), causing super-linear CPU work. Attacker-controlled encoded strings must reach the library through a consuming application; successful requests block that application's event loop and interrupt service.

The record

CVE
CVE-2026-45822
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Sam Verschueren
Product
decode-uri-component
Classifications
CWE-407, CWE-400, CAPEC-469, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 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=0.1.0 <0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sam Verschueren · decode-uri-componentversion=0.1.0 <0.5.0

Published CVSS scores

6.6sealCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-407Inefficient Algorithmic Complexity
CWE-400Uncontrolled Resource Consumption
CAPEC-469HTTP DoS
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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