CVE-2026-82258
SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
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.
- Record
CVE-2026-82258- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-362
- Updated
- 2026-11-02
EUVDEUVD-2026-67584
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.
- Record
EUVD-2026-67584- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hgv7-v322-mmgr
@sveltejs/kit: `query.batch` cross-talk
query.batch() could, under very rare and specific timings, cause concurrent requests from different users to merge and resolve under single request context, enabling cross-user data disclosure.
- Record
GHSA-hgv7-v322-mmgr- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-200
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m99x-q38g-c4c6
SvelteKit versions from 2.38.0 before 2.60.1 contain a race condition in query.batch that allows...
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.
- Record
GHSA-m99x-q38g-c4c6- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/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
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N - Weakness
- CWE-362
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-82258- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/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
- 4.8 Medium
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N - Weakness
- CWE-362
- Updated
- 2026-11-02
OSV
SvelteKit 2.38.0 before 2.60.1 Cross-User Data Disclosure via query.batch
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.
- Record
CVE-2026-82258- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-362
- Updated
- 2026-11-02
OSVGHSA-hgv7-v322-mmgr
@sveltejs/kit: `query.batch` cross-talk
query.batch() could, under very rare and specific timings, cause concurrent requests from different users to merge and resolve under single request context, enabling cross-user data disclosure.
- Record
GHSA-hgv7-v322-mmgr- CVSS 4.0
- 5.9 Medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-200
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
@sveltejs/kitnpm |
2.38.0 to 2.60.0 | 2.60.1 |
@sveltejs/kitnpm |
2.38.0 up to 2.60.1 | 2.60.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-82258 is a medium vulnerability (CVSS 5.9) in Svelte Sveltekit, published May 21, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. Fixed in @sveltejs/kit 2.60.1.
References
github.com/sveltejs/kit/security/advisories/GHSA-hgv7-v322-mmgr
vulncheck.com/advisories/sveltekit-2.38.0-before-2.60.1-cross-user-data-disclosure-via-query-batch
nvd.nist.gov/vuln/detail/CVE-2026-82258