CVE-2026-82256Network attack vector

Node process crash via oversized form payloads

Published Aug 28, 2026 · Updated Aug 28, 2026

Uncontrolled resource consumption in SvelteKit before 2.69.1 allows remote attackers to crash Node processes via oversized remote form payloads. The remote form-function request path processes payload data without enforcing an adequate size limit before Node allocates resources for it. Only deployments exposing remote form functions are reachable; unauthenticated repeated requests can keep the application unavailable by repeatedly terminating its Node process.

CVSS severity6.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in SvelteKit before 2.69.1 allows remote attackers to crash Node processes via oversized remote form payloads. The remote form-function request path processes payload data without enforcing an adequate size limit before Node allocates resources for it. Only deployments exposing remote form functions are reachable; unauthenticated repeated requests can keep the application unavailable by repeatedly terminating its Node process.

The record

CVE
CVE-2026-82256
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Svelte
Product
SvelteKit
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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 <2.69.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Svelte · SvelteKitversion=0 <2.69.1

Published CVSS scores

5.3Svelte GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.9VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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