CVE-2026-82258

MEDIUMNVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-08-28. NVD baseline CVSS 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a single request context. Attackers can exploit specific timing conditions to access sensitive data from other users' concurrent requests.

CVSS v3
4.8
EG Score
4.8(high)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
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 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch | Advisories | VulnCheck

https://www.vulncheck.com/advisories/sveltekit-2.38.0-before-2.60.1-cross-user-data-disclosure-via-query-batch
github Patch Available

`query.batch` cross-talk · Advisory · sveltejs/kit · GitHub

https://github.com/sveltejs/kit/security/advisories/GHSA-hgv7-v322-mmgr

Vendor Advisories for CVE-2026-82258(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—2.60.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 70× 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 02:38 UTCEG score recompute
  2. 2026-09-19 02:38 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 04:50 UTCEG score recompute
  5. 2026-09-18 04:50 UTCGHSA enrichment
  6. 2026-09-17 07:01 UTCEG score recompute
  7. 2026-09-17 07:01 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 09:12 UTCEG score recompute
  10. 2026-09-16 09:12 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 11:04 UTCEG score recompute
  13. 2026-09-15 11:04 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 13:00 UTCEG score recompute
  17. 2026-09-14 13:00 UTCGHSA enrichment
  18. 2026-09-13 15:11 UTCGHSA enrichment
  19. 2026-09-12 17:20 UTCEG score recompute
  20. 2026-09-12 17:20 UTCGHSA enrichment
  21. 2026-09-11 19:31 UTCEG score recompute
  22. 2026-09-11 19:31 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-10 21:42 UTCEG score recompute
Show 45 more
  1. 2026-09-10 21:42 UTCGHSA enrichment
  2. 2026-09-09 23:53 UTCGHSA enrichment
  3. 2026-09-09 00:29 UTCEG score recompute
  4. 2026-09-09 00:29 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 02:17 UTCEG score recompute
  7. 2026-09-08 02:17 UTCGHSA enrichment
  8. 2026-09-07 04:28 UTCEG score recompute
  9. 2026-09-07 04:28 UTCGHSA enrichment
  10. 2026-09-06 13:48 UTCEPSS rescore
  11. 2026-09-06 06:36 UTCEG score recompute
  12. 2026-09-06 06:36 UTCGHSA enrichment
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-05 08:48 UTCEG score recompute
  15. 2026-09-05 08:48 UTCGHSA enrichment
  16. 2026-09-04 10:59 UTCEG score recompute
  17. 2026-09-04 10:59 UTCGHSA enrichment
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-03 13:05 UTCGHSA enrichment
  20. 2026-09-02 15:15 UTCEG score recompute
  21. 2026-09-02 15:15 UTCGHSA enrichment
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 17:24 UTCEG score recompute
  24. 2026-09-01 17:23 UTCGHSA enrichment
  25. 2026-09-01 13:54 UTCEPSS rescore
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-31 19:32 UTCGHSA enrichment
  29. 2026-08-31 18:57 UTCEG score recompute
  30. 2026-08-31 18:57 UTCGHSA enrichment
  31. 2026-08-31 17:08 UTCEG score recompute▼ 1.10
  32. 2026-08-31 17:07 UTCGHSA enrichment
  33. 2026-08-31 17:06 UTCNVD updateCVSS v3 → 4.8
  34. 2026-08-31 13:02 UTCEG score recompute
  35. 2026-08-31 13:02 UTCGHSA enrichment
  36. 2026-08-30 19:18 UTCEPSS rescore
  37. 2026-08-30 19:17 UTCEPSS rescore
  38. 2026-08-30 15:09 UTCEG score recompute
  39. 2026-08-30 15:08 UTCGHSA enrichment
  40. 2026-08-30 01:22 UTCEPSS rescore
  41. 2026-08-29 17:18 UTCGHSA enrichment
  42. 2026-08-28 19:03 UTCGHSA enrichment
  43. 2026-08-28 12:22 UTCEG score recompute
  44. 2026-08-28 11:22 UTCEG score recompute
  45. 2026-08-28 11:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82258?
CVE-2026-82258 is a medium vulnerability published on August 28, 2026. SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows concurrent requests from different users to merge under a single request context. Attackers can exploit specific timing conditions to access sensitive data from other users' concurrent requests.
When was CVE-2026-82258 disclosed?
CVE-2026-82258 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-2026-82258 actively exploited?
CVE-2026-82258 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 95.6% of all scored CVEs.
What is the CVSS score of CVE-2026-82258?
CVE-2026-82258 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-82258?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82258, 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-2026-82258

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