# Withdrawn Advisory: http-cache-semantics max-stale handling can disclose cross-user cached responses

Advisory record · `GHSA-ch52-4w7c-c8xp` · Withdrawn

- **Identifiers:** `GHSA-ch52-4w7c-c8xp` · `CVE-2026-93748`
- **State:** Withdrawn
- **Severity:** CVSS 8.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-524](https://cwe.mitre.org/data/definitions/524.html)
- **Tags:** [CWE-524](https://agentprime.io/advisories/tag/cwe-524.md)
- **Published:** 18 Sept 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

**Withdrawn.** The GitHub Advisory Database withdrew this advisory on 28 Oct 2026. The record stays here, marked withdrawn.

Published by the GitHub Advisory Database at 18 Sept 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `http-cache-semantics` (npm): affected `<=4.2.0`; 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

- 8.7 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0057, the 47th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 18 Sept 2026, 17:51 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-93748)
- 18 Sept 2026, 18:18 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-93748)
- 31 Oct 2026, 13:32 UTC: First seen by agentprime
- 31 Oct 2026, 13:32 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-ch52-4w7c-c8xp)

## Sources

- [GitHub Advisory Database: GHSA-ch52-4w7c-c8xp](https://github.com/advisories/GHSA-ch52-4w7c-c8xp)
- [OSV: GHSA-ch52-4w7c-c8xp](https://osv.dev/vulnerability/GHSA-ch52-4w7c-c8xp)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-93748>
- <https://github.com/kornelski/http-cache-semantics/issues/56>
- <https://github.com/kornelski/http-cache-semantics/issues/56#issuecomment-5975759591>
- <https://github.com/kornelski/http-cache-semantics>
- <https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L425-L441>
- <https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L603-L623>
- <https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-user-cache-disclosure-via-max-stale>

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-ch52-4w7c-c8xp>, 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-ch52-4w7c-c8xp/>. Everything for agents: <https://agentprime.io/llms.txt>.