# CVE-2026-107336: Authentication Bypass by Spoofing in Malcolm

> Attackers can bypass authentication and forge identities in Malcolm's Arkime backend by exploiting a case-sensitivity mismatch in nginx configuration.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-7j32-cf27-cp6h, GHSA-c366-pv2g-9685

## What is CVE-2026-107336?

CVE-2026-107336 is a medium-severity authentication bypass vulnerability in CISA Malcolm, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-863 (Incorrect Authorization), CWE-441 (Unintended Proxy or Intermediary), CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2026-107336?


## How do I fix CVE-2026-107336?

No fix has been published for CVE-2026-107336 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-107336 being exploited?

There is no known exploitation of CVE-2026-107336 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107336 and fix it if it is affected.

What it is: CVE-2026-107336 is a medium-severity authentication bypass vulnerability in CISA Malcolm, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-107336 in the wild and no public exploit code.

Affected product: CISA Malcolm. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107336/ (Markdown: https://insights.sbomify.com/CVE-2026-107336/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107336
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107336
- OSV: https://osv.dev/vulnerability/CVE-2026-107336

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107336/
Summaries are generated and may contain mistakes; the official description above is the record.