CVE-2026-41863: LLM-influenced filename used unsanitized in Path.resolve before file write in Spring AI support for Anthropic Skills API

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: 2026-05-25 · updated 2026-07-23
Weakness: CWE-22

Description

Spring AI's support for Anthropic's Skills API used LLM-influenced filenames unsanitized in Path.resolve before writing files to disk. This could allow a malicious user to write files outside the intended target directory, including restricted directories. Affected versions: Spring AI: 1.1.0 through 1.1.x

Affected products

Spring AI: from 1.1.0 before 1.1.7 — fixed in 1.1.7
Spring AI: from 1.1.0 through 1.1.x

How to fix

Upgrade to a fixed version: Spring AI 1.1.7. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-41863

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