# Litestar's CORS origin allowlist has a bypass due to unescaped regex metacharacters in allowed origins

Advisory record · `GHSA-2p2x-hpg8-cqp2`

- **Identifiers:** `GHSA-2p2x-hpg8-cqp2` · `CVE-2026-25478` · `PYSEC-2026-2195`
- **State:** Confirmed
- **Severity:** CVSS 7.4 High
- **Critical:** No
- **Weakness (CWE):** [CWE-942](https://cwe.mitre.org/data/definitions/942.html)
- **Tags:** [CWE-942](https://agentprime.io/advisories/tag/cwe-942.md)
- **Published:** 9 Feb 2026
- **Updated:** 13 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Feb 2026, 17:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `litestar` (PyPI): affected `>=2.19.0, <2.20.0`; fixed in `2.20.0`

## 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

- 7.4 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:04 UTC: First seen by agentprime
- 31 Oct 2026, 15:04 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2p2x-hpg8-cqp2)

## Sources

- [GitHub Advisory Database: GHSA-2p2x-hpg8-cqp2](https://github.com/advisories/GHSA-2p2x-hpg8-cqp2)
- [OSV: GHSA-2p2x-hpg8-cqp2](https://osv.dev/vulnerability/GHSA-2p2x-hpg8-cqp2)
- <https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-25478>
- <https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a>
- <https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0>
- <https://github.com/litestar-org/litestar>
- <https://github.com/litestar-org/litestar/releases/tag/v2.20.0>

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-2p2x-hpg8-cqp2>, 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-2p2x-hpg8-cqp2/>. Everything for agents: <https://agentprime.io/llms.txt>.