---
id: "CVE-2026-93748"
kind: "vulnerability"
aliases: ["CVE-2026-93748", "GHSA-ch52-4w7c-c8xp"]
title: "Withdrawn Advisory: http-cache-semantics max-stale handling can disclose cross-user cached responses"
severity: "high"
cvss: 8.7
epss: 0.00569
exploited: false
status: "withdrawn"
category: "package"
products: [{"name": "http-cache-semantics", "fixed": [], "affected": "<= 4.2.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-524", "node", "npm", "package", "shared-cache"]
not_affected_if: ["no-shared-cache", "withdrawn-advisory"]
published_at: "2026-09-18T18:18:33+00:00"
first_seen_at: "2026-10-28T21:17:51+00:00"
updated_at: "2026-10-28T21:35:45+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-ch52-4w7c-c8xp", "first_seen_at": "2026-10-28T21:17:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93748", "first_seen_at": "2026-10-28T21:35:45+00:00"}]
---

# Withdrawn Advisory: http-cache-semantics max-stale handling can disclose cross-user cached responses

The advisory says http-cache-semantics through 4.2.0 mishandles client max-stale requests, so cached responses belonging to other users could be returned. The advisory was withdrawn by its publisher as not a valid vulnerability, so the claim is unconfirmed.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- npm:http-cache-semantics affected <= 4.2.0 fixed ?

## How to check

- Run `npm ls http-cache-semantics` to see whether the package is in the dependency tree and at what version
- Check whether any shared cache sits in front of the application and uses this package

## Fix

- No fix needed per the withdrawn advisory; keep the package on a current release such as the latest available from npm
- unknown: the sources do not name a patched version

## Timeline

- 2026-10-28T21:17:51+00:00 ghsa https://github.com/advisories/GHSA-ch52-4w7c-c8xp
- 2026-10-28T21:35:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-93748

## From the sources

### Withdrawn Advisory
This advisory has been withdrawn because it's not a valid vulnerability. This link is maintained to preserve external references.

### Original Description
http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_