CVE-2026-22775Public exploitNetwork attack vector

Service interruption via unchecked ArrayBuffer hydration

Published Jan 15, 2026 · Updated Jan 15, 2026

Resource exhaustion in Svelte devalue 5.1.0 through 5.6.1 allows remote attackers to interrupt services via crafted parse input. The devalue.parse ArrayBuffer hydration path decodes a supplied value as base64 without first requiring a string, while malformed references recurse during hydration and consume disproportionate CPU or memory. Reachability requires an application to pass externally supplied serialized data to devalue.parse; successful input exhausts resources and interrupts the consuming process.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Svelte devalue 5.1.0 through 5.6.1 allows remote attackers to interrupt services via crafted parse input. The devalue.parse ArrayBuffer hydration path decodes a supplied value as base64 without first requiring a string, while malformed references recurse during hydration and consume disproportionate CPU or memory. Reachability requires an application to pass externally supplied serialized data to devalue.parse; successful input exhausts resources and interrupts the consuming process.

The record

CVE
CVE-2026-22775
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Svelte
Product
devalue
Classifications
CWE-405, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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=>= 5.1.0, < 5.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · devalueversion=>= 5.1.0, < 5.6.2

Published CVSS scores

7.5redhat-SADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub, Inc.CVSS: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-405Asymmetric Resource Consumption (Amplification)
T1499Endpoint Denial of Service

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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