CVE-2026-59294: Arbitrary File Write via Path Traversal in ResourceCacheService

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-08-31
Weakness: CWE-22

Description

ResourceCacheService.getCacheName() builds the on-disk filename by appending the URI fragment verbatim, without stripping path separators or .. sequences, and passes the result to new File(resourceParentFolder, newFileName) before writing the downloaded bytes there. Spring AI 2.0.0 Spring AI 1.1.0 - 1.1.8 Spring AI 1.0.9 and earlier

Affected products

Spring AI: before 1.0.10; from 1.1.0 before 1.1.9; from 2.0.0 before 2.0.0.1 — fixed in 1.0.10, 1.1.9, 2.0.0.1
Spring AI: from 1.1.0 through 1.1.8; through 1.0.9; 2.0.0

How to fix

Upgrade to a fixed version: Spring AI 1.0.10, 1.1.9, 2.0.0.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-59294

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