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CVE-2026-107336— Authentication Bypass by Spoofing in Malcolm

Quick assessment

Affected
CISA Malcolm
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.

Malcolm 的前端 Nginx 反向代理中定义了一个“Dashboards → Arkime 快捷方式”（Dashboards → Arkime shortcut）的 location，该 location 使用了一个不区分大小写的正则表达式进行匹配，但随后执行的是区分大小写的重写规则。当请求路径段并非完全小写时（例如 /IDDASH2ARK/...），该请求仍能命中此 location（因为匹配器不区分大小写），却无法触发重写规则（即不会进行重定向），于是 Nginx 会回退到该 location 配置的 p

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
CISA Malcolm ≤ 26.07.1 affected
26.08.0 unaffected
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I. Basic Information for CVE-2026-107336

Vulnerability Information
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Vulnerability Title
Authentication Bypass by Spoofing in Malcolm
Source: CVE Program / CVE List V5
Vulnerability Description
Malcolm's front nginx reverse proxy defines a "Dashboards → Arkime shortcut" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
CISA Malcolm 0 ~ 26.07.1 -

II. Public POCs for CVE-2026-107336

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III. Intelligence Information for CVE-2026-107336

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Other References for CVE-2026-107336 (2)

Same Patch Batch · CISA · 2026-10-08 · 7 CVEs total

CVE-2026-107333 8.1 HIGH Incorrect Authorization in Malcolm
CVE-2026-107362 7.1 HIGH Server-Side Request Forgery in Malcolm
CVE-2026-107337 7.1 HIGH Cross-Site Request Forgery in Malcolm
CVE-2026-107335 6.5 MEDIUM Improper Handling of Highly Compressed Data in Malcolm
CVE-2026-107334 5.4 MEDIUM Incorrect Authorization in Malcolm
CVE-2026-107361 4.2 MEDIUM Authentication Bypass Using an Alternate Path or Channel in Malcolm

IV. Related Vulnerabilities

Same product: Malcolm
Same vendor: CISA
Same weakness: CWE-290

V. Comments for CVE-2026-107336

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