CVE-2026-93748
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductHttp-cache-semantics
PublishedSep 18, 2026
First seenSep 18, 2026
Weakness typeCWE-524CWE-524
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| http-cache-semanticsnpm | v ≤ 4.2.0 | — |
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