# CVE-2026-59308 — Spring AI

> As of 2026-08-21, CVE-2026-59308 is a MEDIUM-severity vulnerability in Spring AI, CVSS v3.1 4.2, EPSS 0.2% (11.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-59308, most recently “91 Spring Framework CVEs Disclosed by Broadcom, Including Critical Deserialization Flaw CVE-2026-59285”.

**Last updated:** 2026-08-21

## What is CVE-2026-59308?

In Spring AI's Semantic Cache support, the context hash used to isolate cached responses between different system prompts could allow cached responses to be shared across unrelated contexts. Affected versions: Spring AI: 2.0.0

The record classifies CVE-2026-59308 under weakness class [CWE-668](https://intel.threadlinqs.com/cwe/CWE-668). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 67 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.2 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 11.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-21

## Is CVE-2026-59308 being exploited?

It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Spring](https://intel.threadlinqs.com/vendors/spring): AI

## How to fix CVE-2026-59308

Vendor advisory: [https://spring.io/security/cve-2026-59308](https://spring.io/security/cve-2026-59308). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-59308

1 tracked threat in the Threadlinqs corpus references CVE-2026-59308, either in the campaign’s CVE list or as an indicator on the campaign record.

- [91 Spring Framework CVEs Disclosed by Broadcom, Including Critical Deserialization Flaw CVE-2026-59285](https://intel.threadlinqs.com/threat/TL-2026-2105) — CRITICAL · 2026-08-21

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [spring.io](https://spring.io/security/cve-2026-59308)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-59308
Full detection coverage and IOCs for threats exploiting CVE-2026-59308 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp