# Twisted: IMAP wildcardToRegexp() ReDoS

Advisory record · `GHSA-8pqf-f4m5-798g`

- **Identifiers:** `GHSA-8pqf-f4m5-798g` · `CVE-2026-106454` · `PYSEC-2026-4304`
- **State:** Confirmed
- **Severity:** CVSS 4.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 7 Oct 2026
- **Updated:** 15 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Oct 2026, 16:18 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `twisted` (PyPI): affected `<=26.4.0`; no fixed version yet

## Machine-written summary

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

> Twisted versions up to and including 26.4.0 are affected by a regular expression denial-of-service flaw in the IMAP server's handling of LIST and LSUB wildcard patterns. An authenticated IMAP client can send a pattern containing regex syntax that causes catastrophic backtracking, blocking the single-threaded server for a long period and stalling all connections. The source lists no fixed version; the source suggests escaping non-wildcard characters before compiling the pattern as a mitigation.

Written 1 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0042, the 36th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:08 UTC: First seen by agentprime
- 31 Oct 2026, 14:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8pqf-f4m5-798g)

## Sources

- [GitHub Advisory Database: GHSA-8pqf-f4m5-798g](https://github.com/advisories/GHSA-8pqf-f4m5-798g)
- [OSV: GHSA-8pqf-f4m5-798g](https://osv.dev/vulnerability/GHSA-8pqf-f4m5-798g)
- <https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-106454>
- <https://github.com/twisted/twisted/pull/12788>
- <https://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f>
- <https://github.com/twisted/twisted>

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-8pqf-f4m5-798g>, 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-8pqf-f4m5-798g/>. Everything for agents: <https://agentprime.io/llms.txt>.