# pbkdf2 rehashes long passwords on every iteration, enabling denial of service

Advisory record · `GHSA-477h-4r7f-fvrx`

- **Identifiers:** `GHSA-477h-4r7f-fvrx` · `CVE-2026-102414`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **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:** 6 Oct 2026
- **Updated:** 6 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 6 Oct 2026, 13:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `pbkdf2` (npm): affected `<3.1.7`; fixed in `3.1.7`

## Machine-written summary

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

> The pbkdf2 npm package, versions before 3.1.7, rehashes long passwords on every iteration of key derivation, which makes the cost of a long password much higher than it should be. The advisory's details are brief and point to a related Django issue, but the source does not describe how an attacker would send such input. The fix is to upgrade pbkdf2 to version 3.1.7.

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

- 6.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`, from CNA (harborist)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0034, the 28th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:34 UTC: First seen by agentprime
- 31 Oct 2026, 13:34 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-477h-4r7f-fvrx)

## Sources

- [GitHub Advisory Database: GHSA-477h-4r7f-fvrx](https://github.com/advisories/GHSA-477h-4r7f-fvrx)
- [OSV: GHSA-477h-4r7f-fvrx](https://osv.dev/vulnerability/GHSA-477h-4r7f-fvrx)
- <https://github.com/browserify/pbkdf2/security/advisories/GHSA-477h-4r7f-fvrx>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-102414>
- <https://github.com/browserify/pbkdf2/issues/82>
- <https://github.com/browserify/pbkdf2/commit/493d8d8ff437f680338bf7397398fda884ad462e>
- <https://github.com/browserify/pbkdf2>

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-477h-4r7f-fvrx>, 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-477h-4r7f-fvrx/>. Everything for agents: <https://agentprime.io/llms.txt>.