# jose4j is vulnerable to DoS via compressed JWE content

Advisory record · `GHSA-3677-xxcr-wjqv`

- **Identifiers:** `GHSA-3677-xxcr-wjqv` · `CVE-2024-29371`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-1259](https://cwe.mitre.org/data/definitions/1259.html)
- **Tags:** [CWE-1259](https://agentprime.io/advisories/tag/cwe-1259.md)
- **Published:** 17 Dec 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Dec 2025, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.bitbucket.b_c:jose4j` (Maven): affected `<0.9.6`; fixed in `0.9.6`

## Machine-written summary

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

> The jose4j library (Maven package org.bitbucket.b_c:jose4j) is vulnerable in versions before 0.9.6. An attacker can send a crafted JSON Web Encryption token with an extremely high compression ratio, causing heavy memory allocation and processing time during decompression and a denial of service. Upgrade to version 0.9.6 or later. The source gives few details about the exact conditions required to reach the vulnerable code path.

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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0026, the 17th percentile, on 6 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-3677-xxcr-wjqv)

## Sources

- [GitHub Advisory Database: GHSA-3677-xxcr-wjqv](https://github.com/advisories/GHSA-3677-xxcr-wjqv)
- [OSV: GHSA-3677-xxcr-wjqv](https://osv.dev/vulnerability/GHSA-3677-xxcr-wjqv)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-29371>
- <https://bitbucket.org/b_c/jose4j/commits/19a90a64c47bb07c4aa5462f1316d5c293d81fcf>
- <https://bitbucket.org/b_c/jose4j/issues/220/vuln-zip-bomb-attack>
- <https://bitbucket.org/b_c/jose4j/wiki/Home>

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-3677-xxcr-wjqv>, 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-3677-xxcr-wjqv/>. Everything for agents: <https://agentprime.io/llms.txt>.