CVE-2026-115635 json
AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set
published 2026-10-25 14 d ago modified 2026-10-26 13 d ago also EEF-CVE-2026-115635 , GHSA-36hg-wwp2-fg8w , EUVD-2026-109568
- cvss
- 6.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert.
When Ash.bulk_create/4 or a single create runs as an upsert with return_skipped_upsert?: true and the upsert is skipped (for example because its upsert_condition does not hold), AshPostgres.DataLayer reads the existing row back by the upsert identity in do_bulk_create/3 and upsert/4. That lookup did not apply the resource's attribute multitenancy, so on a resource using strategy :attribute it could match and return the row of another tenant with the same identity values, exposing its fields to the caller.
This issue affects ash_postgres: from 2.6.22 before 2.15.2.
Patch / fix
- hex ash_postgres 2.15.2
- ash-project ash_postgres 2.15.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 13 d ago
Exploit prediction
0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| hex | ash_postgres | >=2.6.22, <2.15.2 |
2.15.2 |
Affected products
- ash-project ash_postgres
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5
related, web
-
github.com
/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9
patch
-
github.com
/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w
vendor-advisory, related, advisory
-
cna.erlef.org
/cves/CVE-2026-115635.html
related, web
-
osv.dev
/vulnerability/EEF-CVE-2026-115635
related
-
hex.pm
/packages/ash_postgres
package
Sources
- CVE List CVE-2026-115635
- NVD CVE-2026-115635
- OSV EEF-CVE-2026-115635
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