CVE-2026-82256

SvelteKit before 2.69.1 Denial of Service via Remote Form

6.9 MediumFix available

SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing attackers to crash the Node process by sending large payloads. Repeated exploitation causes denial of service by repeatedly crashing the application process.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.42%Up 0.2 points since Aug 29, 2026

What each source reports

CVE List Score used 6.9

SvelteKit before 2.69.1 Denial of Service via Remote Form

Record: CVE-2026-82256
CVSS 4.0: 6.9 MediumCVSS: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 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2026-67582 6.9

Record: EUVD-2026-67582
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-qcf5-5x72-5253 6.9

SvelteKit before 2.69.1 fails to properly validate remote form function payload sizes, allowing...

Record: GHSA-qcf5-5x72-5253
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

GitHub AdvisoriesGHSA-wqjv-9729-c5q2 5.3

SvelteKit: Big remote form function payloads can cause Node process to crash

Big remote form function payloads can cause the Node process to crash. Doing this repeatedly can cause DoS.

Record: GHSA-wqjv-9729-c5q2
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-248
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-82256
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

OSV 6.9

SvelteKit before 2.69.1 Denial of Service via Remote Form

Record: CVE-2026-82256
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-400
Updated: 2026-11-02

OSVGHSA-wqjv-9729-c5q2 5.3

SvelteKit: Big remote form function payloads can cause Node process to crash

Big remote form function payloads can cause the Node process to crash. Doing this repeatedly can cause DoS.

Record: GHSA-wqjv-9729-c5q2
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-248
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`@sveltejs/kit` npm	through 2.69.0	2.69.1
`@sveltejs/kit` npm	before 2.69.1	2.69.1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-82256 is a medium vulnerability (CVSS 6.9) in Svelte Sveltekit, published July 24, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in @sveltejs/kit 2.69.1.

References

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