# CVE-2026-15812: Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links

> Remote attackers can bypass access controls and inject arbitrary data by spoofing link IDs in unencrypted dynamic links, affecting Kronosnet users.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jul 2026
- **Updated:** 21 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-15812, GHSA-36hw-mpc9-fw23, UBUNTU-CVE-2026-15812

## What is CVE-2026-15812?

CVE-2026-15812 is a medium-severity authentication bypass vulnerability in Red Hat Enterprise Linux 10, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network traffic from any IP address) without network payload encryption, the validation architecture implicitly trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer, potentially leading to data corruption or service instabilities.

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2026-15812?


## How do I fix CVE-2026-15812?

Upgrade to a fixed version.

## Is CVE-2026-15812 being exploited?

There is no known exploitation of CVE-2026-15812 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15812 and fix it if it is affected.

What it is: CVE-2026-15812 is a medium-severity authentication bypass vulnerability in Red Hat Enterprise Linux 10, published on 21 Jul 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-2026-15812 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. 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-2026-15812/ (Markdown: https://insights.sbomify.com/CVE-2026-15812/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15812
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15812
- OSV: https://osv.dev/vulnerability/CVE-2026-15812

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15812/
Summaries are generated and may contain mistakes; the official description above is the record.