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CVE-2026-93750— http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard

Quick assessment

Affected
kornelski http-cache-semantics
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

4.2.0 及更早版本存在一个缓存验证漏洞。该漏洞位于 函数中，由于采用逐字节字符串比较的方式，导致无法正确验证 头中的通配符。攻击者可以请求其他客户端之前已获取的 URL，从而收到原本面向不同用户缓存的响应，进而跨客户端泄露敏感信息。

CVSS 5.9 · Medium EPSS 0.35% · P29

Possible ATT&CK Techniques 1 AI

T1039 · Data from Network Shared Drive

Affected Version Matrix 1

VendorProduct Version RangeStatus
kornelski http-cache-semantics ≤ 4.2.0 affected
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I. Basic Information for CVE-2026-93750

Vulnerability Information
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Vulnerability Title
http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard
Source: CVE Program / CVE List V5
Vulnerability Description
http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kornelski http-cache-semantics 0 ~ 4.2.0 -

II. Public POCs for CVE-2026-93750

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III. Intelligence Information for CVE-2026-93750

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Other References for CVE-2026-93750 (2)

IV. Related Vulnerabilities

Same product: http-cache-semantics
Same vendor: kornelski
Same weakness: CWE-436

V. Comments for CVE-2026-93750

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