# Bit flip attack vulnerability in cookie-encrypter

Advisory record · `GHSA-h63v-hw6g-x8hp`

- **Identifiers:** `GHSA-h63v-hw6g-x8hp` · `CVE-2024-53441`
- **State:** Confirmed
- **Severity:** CVSS 8.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-325](https://cwe.mitre.org/data/definitions/325.html) · [CWE-327](https://cwe.mitre.org/data/definitions/327.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md) · [CWE-325](https://agentprime.io/advisories/tag/cwe-325.md)
- **Published:** 9 Dec 2024
- **Updated:** 11 Dec 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Dec 2024, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `cookie-encrypter` (npm): affected `<=1.0.1`; no fixed version yet

## 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

- 8.2 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0029, the 21st 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 9 Dec 2024. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-h63v-hw6g-x8hp](https://github.com/advisories/GHSA-h63v-hw6g-x8hp)
- [OSV: GHSA-h63v-hw6g-x8hp](https://osv.dev/vulnerability/GHSA-h63v-hw6g-x8hp)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-53441>
- <https://github.com/ebourmalo/cookie-encrypter/issues/9>
- <https://crypto.stackexchange.com/questions/66085/bit-flipping-attack-on-cbc-mode>
- <https://gist.github.com/mathysEthical/f45f1503f87381090e38a33c50eec971>
- <https://github.com/ebourmalo/cookie-encrypter>
- <https://mathys.reboux.pro/CVE/2024/53441>

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-h63v-hw6g-x8hp>, 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-h63v-hw6g-x8hp/>. Everything for agents: <https://agentprime.io/llms.txt>.