# Spring MVC and WebFlux has Server Sent Event stream corruption

Advisory record · `GHSA-6hcq-hmm3-jj3c`

- **Identifiers:** `GHSA-6hcq-hmm3-jj3c` · `CVE-2026-22735`
- **State:** Confirmed
- **Severity:** CVSS 2.6 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-667](https://cwe.mitre.org/data/definitions/667.html)
- **Tags:** [CWE-667](https://agentprime.io/advisories/tag/cwe-667.md)
- **Published:** 20 Mar 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Mar 2026, 00:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.springframework:spring-webmvc` (Maven): affected `>=7.0.0-M1, <7.0.6 || >=6.2.0, <6.2.17 || >=6.0.0, <=6.1.21 || >=5.3.0, <=5.3.39`; fixed in `7.0.6`, `6.2.17`
- `org.springframework:spring-webflux` (Maven): affected `>=7.0.0-M1, <7.0.6 || >=6.2.0, <6.2.17 || >=6.0.0, <=6.1.21 || >=5.3.0, <=5.3.39`; fixed in `7.0.6`, `6.2.17`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 2.6 Low, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N`, from CNA (vmware)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-6hcq-hmm3-jj3c)

## Sources

- [GitHub Advisory Database: GHSA-6hcq-hmm3-jj3c](https://github.com/advisories/GHSA-6hcq-hmm3-jj3c)
- [OSV: GHSA-6hcq-hmm3-jj3c](https://osv.dev/vulnerability/GHSA-6hcq-hmm3-jj3c)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-22735>
- <https://github.com/spring-projects/spring-framework>
- <https://spring.io/security/cve-2026-22735>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-6hcq-hmm3-jj3c>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-6hcq-hmm3-jj3c/>. Everything for agents: <https://agentprime.io/llms.txt>.