# joserfc: Unbounded JWE General JSON \`recipients\` Array Leads to CPU Exhaustion (DoS) via Repeated RSA Private-Key Decryption

Advisory record · `GHSA-jpxq-7h8p-2q76`

- **Identifiers:** `GHSA-jpxq-7h8p-2q76` · `CVE-2026-119283`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 30 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Oct 2026, 14:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `joserfc` (PyPI): affected `<1.7.5`; fixed in `1.7.5`

## Machine-written summary

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

> The joserfc Python package, versions before 1.7.5, does not limit the number of entries in the recipients array of a JWE General JSON document passed to decrypt_json(). An unauthenticated remote attacker who can get such a document to an endpoint that decrypts it with an RSA key can force many RSA private-key operations from a small request, exhausting CPU and degrading availability. The documented verify_all_recipients=False option does not reduce this cost. Upgrade to joserfc 1.7.5, which is listed as the fixed version.

Written 31 Oct 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 CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0023, the 13th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:07 UTC: First seen by agentprime
- 31 Oct 2026, 14:07 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-jpxq-7h8p-2q76)

## Sources

- [GitHub Advisory Database: GHSA-jpxq-7h8p-2q76](https://github.com/advisories/GHSA-jpxq-7h8p-2q76)
- [OSV: GHSA-jpxq-7h8p-2q76](https://osv.dev/vulnerability/GHSA-jpxq-7h8p-2q76)
- <https://github.com/authlib/joserfc/security/advisories/GHSA-jpxq-7h8p-2q76>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-119283>
- <https://github.com/authlib/joserfc/commit/d6dc8df6c7609277e741069d3733e43996c1cd17>
- <https://github.com/authlib/joserfc>
- <https://github.com/authlib/joserfc/releases/tag/1.7.5>

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-jpxq-7h8p-2q76>, 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-jpxq-7h8p-2q76/>. Everything for agents: <https://agentprime.io/llms.txt>.