Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-119559— OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch

Quick assessment

Affected
litespeedtech openlitespeed
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.

OpenLiteSpeed 1.9.4 及以下版本存在一个身份验证绕过漏洞，允许未认证的远程攻击者绕过 HTTP/3 协议下的虚拟主机客户端证书要求。由于 QuicStream 继承了一个始终返回 true 的 verifyContext() 实现，攻击者可以提交一个非 mTLS 主机的 SNI（服务器名称指示），并配合受保护的 Host 请求头，从而访问受保护的内容。

CVSS 5.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
litespeedtech openlitespeed ≤ 1.9.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-119559

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
OpenLiteSpeed through 1.9.4 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to evade virtual host client certificate requirements over HTTP/3. Because QuicStream inherits a verifyContext() implementation that always returns true, attackers can present a non-mTLS host's SNI with a protected Host header to access protected content.
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
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
litespeedtech openlitespeed 0 ~ 1.9.4 -

II. Public POCs for CVE-2026-119559

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-119559

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-119559 (1)

Vendor Pages for CVE-2026-119559 (1)

Other References for CVE-2026-119559 (2)

IV. Related Vulnerabilities

Same product: openlitespeed
Same vendor: litespeedtech
Same weakness: CWE-295