# Denial of Service in Connect2id Nimbus JOSE+JWT

Advisory record · `GHSA-gvpg-vgmx-xg6w`

- **Identifiers:** `GHSA-gvpg-vgmx-xg6w` · `CVE-2023-52428`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 11 Feb 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Feb 2024, 06:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `com.nimbusds:nimbus-jose-jwt` (Maven): affected `<9.37.2`; fixed in `9.37.2`

## Machine-written summary

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

> Nimbus JOSE+JWT (com.nimbusds:nimbus-jose-jwt) versions before 9.37.2 are vulnerable to denial of service. An attacker who can submit a JWE token to an application that uses PasswordBasedDecrypter can supply a very large p2c (PBKDF2 iteration count) header value, consuming excessive resources during decryption. Upgrade to version 9.37.2 or later.

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:** 0.0081, the 57th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:18 UTC: First seen by agentprime
- 31 Oct 2026, 14:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-gvpg-vgmx-xg6w)

## Sources

- [GitHub Advisory Database: GHSA-gvpg-vgmx-xg6w](https://github.com/advisories/GHSA-gvpg-vgmx-xg6w)
- [OSV: GHSA-gvpg-vgmx-xg6w](https://osv.dev/vulnerability/GHSA-gvpg-vgmx-xg6w)
- <https://nvd.nist.gov/vuln/detail/CVE-2023-52428>
- <https://bitbucket.org/connect2id/nimbus-jose-jwt>
- <https://bitbucket.org/connect2id/nimbus-jose-jwt/commits/3b3b77e>
- <https://bitbucket.org/connect2id/nimbus-jose-jwt/issues/526>
- <https://connect2id.com/products/nimbus-jose-jwt>

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-gvpg-vgmx-xg6w>, 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-gvpg-vgmx-xg6w/>. Everything for agents: <https://agentprime.io/llms.txt>.