CVE-2026-82257

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-08-28. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
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 before 2.69.1 Prototype Pollution via File Input | Advisories | VulnCheck

https://www.vulncheck.com/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input
github Patch Available

Prototype pollution in file input deletion path in remote-function forms · Advisory · sveltejs/kit · GitHub

https://github.com/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x

Vendor Advisories for CVE-2026-82257(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—2.69.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 62× 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. 2026-09-18 23:55 UTCEG score recompute
  2. 2026-09-18 23:55 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-17 22:07 UTCEG score recompute
  5. 2026-09-17 22:07 UTCGHSA enrichment
  6. 2026-09-16 20:19 UTCEG score recompute
  7. 2026-09-16 20:19 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 18:28 UTCEG score recompute
  11. 2026-09-15 18:28 UTCGHSA enrichment
  12. 2026-09-15 03:12 UTCEPSS rescore
  13. 2026-09-15 03:12 UTCEPSS rescore
  14. 2026-09-14 16:20 UTCEG score recompute
  15. 2026-09-14 16:20 UTCGHSA enrichment
  16. 2026-09-13 14:33 UTCEG score recompute
  17. 2026-09-13 14:33 UTCGHSA enrichment
  18. 2026-09-12 12:45 UTCEG score recompute
  19. 2026-09-12 12:45 UTCGHSA enrichment
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 10:57 UTCEG score recompute
  23. 2026-09-11 10:57 UTCGHSA enrichment
  24. 2026-09-10 09:10 UTCGHSA enrichment
  25. 2026-09-09 07:21 UTCEG score recompute
Show 37 more
  1. 2026-09-09 07:21 UTCGHSA enrichment
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-08 05:34 UTCEG score recompute
  4. 2026-09-08 05:33 UTCGHSA enrichment
  5. 2026-09-07 03:43 UTCEG score recompute
  6. 2026-09-07 03:43 UTCGHSA enrichment
  7. 2026-09-06 13:48 UTCEPSS rescore
  8. 2026-09-06 01:51 UTCEG score recompute
  9. 2026-09-06 01:51 UTCGHSA enrichment
  10. 2026-09-05 15:31 UTCEPSS rescore
  11. 2026-09-05 00:04 UTCEG score recompute
  12. 2026-09-05 00:04 UTCGHSA enrichment
  13. 2026-09-04 05:07 UTCEPSS rescore
  14. 2026-09-03 22:16 UTCGHSA enrichment
  15. 2026-09-02 20:28 UTCEG score recompute
  16. 2026-09-02 20:28 UTCGHSA enrichment
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 18:40 UTCEG score recompute
  19. 2026-09-01 18:39 UTCGHSA enrichment
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-08-31 16:50 UTCGHSA enrichment
  24. 2026-08-30 22:39 UTCEG score recompute
  25. 2026-08-30 22:39 UTCGHSA enrichment
  26. 2026-08-30 19:18 UTCEPSS rescore
  27. 2026-08-30 19:17 UTCEPSS rescore
  28. 2026-08-30 01:22 UTCEPSS rescore
  29. 2026-08-29 20:51 UTCGHSA enrichment
  30. 2026-08-28 19:03 UTCGHSA enrichment
  31. 2026-08-28 16:36 UTCEG score recompute
  32. 2026-08-28 16:35 UTCGHSA enrichment
  33. 2026-08-28 15:37 UTCEG score recompute
  34. 2026-08-28 15:37 UTCGHSA enrichment
  35. 2026-08-28 12:22 UTCEG score recompute
  36. 2026-08-28 11:23 UTCEG score recompute
  37. 2026-08-28 11:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82257?
CVE-2026-82257 is a medium vulnerability published on August 28, 2026. SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application…
When was CVE-2026-82257 disclosed?
CVE-2026-82257 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-2026-82257 actively exploited?
CVE-2026-82257 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 89.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82257?
CVE-2026-82257 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-82257?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82257, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-82257

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