# CVE-2026-90455: Dependency on vulnerable third-party component in Malcolm

> A vulnerable HTTP library was reintroduced into Malcolm, though limited exploitability exists due to fixed trusted URLs and lack of attacker input processing.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Sep 2026
- **Updated:** 2 Oct 2026
- **Also known as:** GHSA-wv2v-v3c6-8438

## What is CVE-2026-90455?

CVE-2026-90455 is a medium-severity vulnerability in CISA Malcolm, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A prior update that raised a bundled HTTP client library to a version remediating known vulnerabilities was later reverted, reintroducing the earlier, vulnerable version into a log-processing component. The only code path in that component using the library issues a request to a single fixed, trusted vendor URL at initialization and does not process attacker-controlled input through the library, limiting practical exploitability of the reintroduced version in this context.

Weakness: CWE-1395 (Dependency on Vulnerable Third-Party Component)

## Which versions are affected by CVE-2026-90455?


## How do I fix CVE-2026-90455?

No fix has been published for CVE-2026-90455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90455 being exploited?

There is no known exploitation of CVE-2026-90455 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90455 and fix it if it is affected.

What it is: CVE-2026-90455 is a medium-severity vulnerability in CISA Malcolm, published on 11 Sep 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-2026-90455 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-2026-90455/ (Markdown: https://insights.sbomify.com/CVE-2026-90455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90455
- OSV: https://osv.dev/vulnerability/CVE-2026-90455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90455/
Summaries are generated and may contain mistakes; the official description above is the record.