# decode-uri-component: Denial of service via exponential decoding of malformed percent-encoded input

Advisory record · `GHSA-vcc3-ghjq-m6fr`

- **Identifiers:** `GHSA-vcc3-ghjq-m6fr` · `CVE-2026-45822`
- **State:** Confirmed
- **Severity:** CVSS 6.6 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-405](https://cwe.mitre.org/data/definitions/405.html) · [CWE-407](https://cwe.mitre.org/data/definitions/407.html) · [CWE-1176](https://cwe.mitre.org/data/definitions/1176.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) · [CWE-405](https://agentprime.io/advisories/tag/cwe-405.md) · [CWE-1176](https://agentprime.io/advisories/tag/cwe-1176.md)
- **Published:** 31 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 31 Aug 2026, 22:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `decode-uri-component` (npm): affected `<0.5.0`; fixed in `0.5.0`

## 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

- 6.6 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/S:N/AU:Y/R:U/V:D/RE:M/U:Amber`, from CNA (seal)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0051, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 31 Aug 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-vcc3-ghjq-m6fr](https://github.com/advisories/GHSA-vcc3-ghjq-m6fr)
- [OSV: GHSA-vcc3-ghjq-m6fr](https://osv.dev/vulnerability/GHSA-vcc3-ghjq-m6fr)
- <https://github.com/SamVerschueren/decode-uri-component/security/advisories/GHSA-vcc3-ghjq-m6fr>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-45822>
- <https://github.com/SamVerschueren/decode-uri-component/commit/fa479dafeede7bedf04e5c89aa78f2a78c664005>
- <https://github.com/SamVerschueren/decode-uri-component>
- <https://github.com/SamVerschueren/decode-uri-component/blob/00662938dc7c6241547ae8abce7785cc13ffd3f6/index.js>
- <https://github.com/SamVerschueren/decode-uri-component/releases/tag/v0.5.0>
- <https://www.npmjs.com/package/decode-uri-component>

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-vcc3-ghjq-m6fr>, 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-vcc3-ghjq-m6fr/>. Everything for agents: <https://agentprime.io/llms.txt>.