CVE-2026-82257Network attack vectorHinoki check available

Service interruption via prototype method deletion

Published Aug 28, 2026 · Updated Aug 28, 2026

Prototype pollution in SvelteKit before 2.69.1 allows remote attackers to interrupt application functions through crafted file inputs. The remote-form file-input deletion path treats arbitrary user-controlled field paths as object paths, allowing deletion to reach and remove prototype methods. Exposure requires the experimental remoteFunctions option, a remote form with a file field, acceptance of arbitrary path names, and user interaction; successful exploitation disables affected application functionality.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Prototype pollution in SvelteKit before 2.69.1 allows remote attackers to interrupt application functions through crafted file inputs. The remote-form file-input deletion path treats arbitrary user-controlled field paths as object paths, allowing deletion to reach and remove prototype methods. Exposure requires the experimental remoteFunctions option, a remote form with a file field, acceptance of arbitrary path names, and user interaction; successful exploitation disables affected application functionality.

The record

CVE
CVE-2026-82257
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Svelte
Product
SvelteKit
Classifications
CWE-1321, T1499.004
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

5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1499.004Application or System Exploitation

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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