# Spring Framework Multipart Request Smuggling in Spring MVC and WebFlux

Advisory record · `GHSA-cjpg-rgq5-fr37`

- **Identifiers:** `GHSA-cjpg-rgq5-fr37` · `CVE-2026-41853`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html)
- **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md)
- **Published:** 9 Jun 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Jun 2026, 06:31 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, <7.0.8 || >=6.2.0, <6.2.19 || >=6.1.0, <=6.1.21 || <=5.3.39`; fixed in `7.0.8`, `6.2.19`
- `org.springframework:spring-webflux` (Maven): affected `>=7.0.0, <7.0.8 || >=6.2.0, <6.2.19 || >=6.1.0, <=6.1.21 || <=5.3.39`; fixed in `7.0.8`, `6.2.19`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Spring Framework's spring-webmvc and spring-webflux packages are vulnerable to multipart request smuggling in affected versions. The source gives few details on attacker requirements and lists conflicting version ranges. Upgrade to 7.0.8 or 6.2.19; no fix is listed for 6.1.x or 5.3.x.

Written 2 Nov 2026.

## 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

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`, from CNA (vmware)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-cjpg-rgq5-fr37)

## Sources

- [GitHub Advisory Database: GHSA-cjpg-rgq5-fr37](https://github.com/advisories/GHSA-cjpg-rgq5-fr37)
- [OSV: GHSA-cjpg-rgq5-fr37](https://osv.dev/vulnerability/GHSA-cjpg-rgq5-fr37)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-41853>
- <https://github.com/spring-projects/spring-framework>
- <https://github.com/spring-projects/spring-framework/releases/tag/v6.2.19>
- <https://github.com/spring-projects/spring-framework/releases/tag/v7.0.8>
- <https://spring.io/security/cve-2026-41853>

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-cjpg-rgq5-fr37>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-cjpg-rgq5-fr37/>. Everything for agents: <https://agentprime.io/llms.txt>.