CVE-2026-82259

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or individual file sizes, an attacker can submit relatively small inputs that expand into very large file arrays, leading to expensive processing and denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: github.
generic

SvelteKit 2.49.0 before 2.53.3 Denial of Service via form | Advisories | VulnCheck

https://www.vulncheck.com/advisories/sveltekit-2.49.0-before-2.53.3-denial-of-service-via-form
github Patch Available

Deserialization expansion in unvalidated SvelteKit `form` remote function leads to denial of service (experimental only) · Advisory · sveltejs/kit · GitHub

https://github.com/sveltejs/kit/security/advisories/GHSA-fpg4-jhqr-589c

Vendor Advisories for CVE-2026-82259(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@sveltejs/kit—2.53.3—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 91× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 01:10 UTCEG score recompute
  2. 2026-09-19 01:10 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 13:47 UTCGHSA enrichment
  5. 2026-09-18 02:25 UTCEG score recompute
  6. 2026-09-18 02:25 UTCGHSA enrichment
  7. 2026-09-17 15:03 UTCGHSA enrichment
  8. 2026-09-17 03:41 UTCGHSA enrichment
  9. 2026-09-16 16:18 UTCEG score recompute
  10. 2026-09-16 16:18 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 04:53 UTCGHSA enrichment
  14. 2026-09-15 17:31 UTCGHSA enrichment
  15. 2026-09-15 06:08 UTCEG score recompute
  16. 2026-09-15 06:08 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 18:46 UTCGHSA enrichment
  20. 2026-09-14 07:06 UTCGHSA enrichment
  21. 2026-09-13 19:44 UTCEG score recompute
  22. 2026-09-13 19:44 UTCGHSA enrichment
  23. 2026-09-13 08:21 UTCGHSA enrichment
  24. 2026-09-12 21:00 UTCEG score recompute
  25. 2026-09-12 21:00 UTCGHSA enrichment
Show 66 more
  1. 2026-09-12 09:38 UTCGHSA enrichment
  2. 2026-09-11 22:16 UTCEG score recompute
  3. 2026-09-11 22:15 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 10:51 UTCEG score recompute
  7. 2026-09-11 10:51 UTCGHSA enrichment
  8. 2026-09-10 23:11 UTCGHSA enrichment
  9. 2026-09-10 11:49 UTCEG score recompute
  10. 2026-09-10 11:49 UTCGHSA enrichment
  11. 2026-09-09 23:53 UTCGHSA enrichment
  12. 2026-09-09 11:51 UTCGHSA enrichment
  13. 2026-09-09 00:29 UTCEG score recompute
  14. 2026-09-09 00:29 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 07:54 UTCGHSA enrichment
  17. 2026-09-07 20:27 UTCEG score recompute
  18. 2026-09-07 20:27 UTCGHSA enrichment
  19. 2026-09-07 09:04 UTCGHSA enrichment
  20. 2026-09-06 21:38 UTCEG score recompute
  21. 2026-09-06 21:38 UTCGHSA enrichment
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 10:14 UTCGHSA enrichment
  24. 2026-09-05 22:48 UTCEG score recompute
  25. 2026-09-05 22:48 UTCGHSA enrichment
  26. 2026-09-05 15:31 UTCEPSS rescore
  27. 2026-09-05 11:26 UTCGHSA enrichment
  28. 2026-09-05 00:04 UTCEG score recompute
  29. 2026-09-05 00:04 UTCGHSA enrichment
  30. 2026-09-04 12:42 UTCEG score recompute
  31. 2026-09-04 12:42 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-04 01:20 UTCGHSA enrichment
  34. 2026-09-03 13:57 UTCGHSA enrichment
  35. 2026-09-03 02:33 UTCGHSA enrichment
  36. 2026-09-02 15:10 UTCEG score recompute
  37. 2026-09-02 15:09 UTCGHSA enrichment
  38. 2026-09-02 14:12 UTCEPSS rescore
  39. 2026-09-02 03:40 UTCGHSA enrichment
  40. 2026-09-01 16:16 UTCEG score recompute
  41. 2026-09-01 16:16 UTCGHSA enrichment
  42. 2026-09-01 13:54 UTCEPSS rescore
  43. 2026-09-01 04:50 UTCEG score recompute
  44. 2026-09-01 04:50 UTCGHSA enrichment
  45. 2026-09-01 04:40 UTCEPSS rescore
  46. 2026-09-01 04:40 UTCEPSS rescore
  47. 2026-08-31 17:24 UTCGHSA enrichment
  48. 2026-08-31 16:47 UTCGHSA enrichment
  49. 2026-08-31 03:57 UTCEG score recompute
  50. 2026-08-31 03:57 UTCGHSA enrichment
  51. 2026-08-30 19:18 UTCEPSS rescore
  52. 2026-08-30 19:17 UTCEPSS rescore
  53. 2026-08-30 16:35 UTCGHSA enrichment
  54. 2026-08-30 05:13 UTCEG score recompute
  55. 2026-08-30 05:13 UTCGHSA enrichment
  56. 2026-08-30 01:22 UTCEPSS rescore
  57. 2026-08-29 17:51 UTCGHSA enrichment
  58. 2026-08-29 06:25 UTCGHSA enrichment
  59. 2026-08-28 19:03 UTCGHSA enrichment
  60. 2026-08-28 16:36 UTCEG score recompute
  61. 2026-08-28 16:35 UTCGHSA enrichment
  62. 2026-08-28 15:37 UTCEG score recompute
  63. 2026-08-28 15:37 UTCGHSA enrichment
  64. 2026-08-28 12:22 UTCEG score recompute
  65. 2026-08-28 11:22 UTCEG score recompute
  66. 2026-08-28 11:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82259?
CVE-2026-82259 is a high vulnerability published on August 28, 2026. SvelteKit versions from 2.49.0 through 2.53.2 (fixed in 2.53.3) contain a deserialization expansion issue in the experimental form remote function. When an application enables experimental.remoteFunctions and uses the form function to process the files array without validating files.length or…
When was CVE-2026-82259 disclosed?
CVE-2026-82259 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82259 actively exploited?
CVE-2026-82259 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82259?
CVE-2026-82259 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-82259?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82259, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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