# CVE-2026-55706: Auth bypass in OpenBSD

> An attacker can bypass PPP authentication in OpenBSD by exploiting improper length validation in the PAP input handler.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jun 2026
- **Updated:** 17 Jun 2026
- **Also known as:** GHSA-rrgf-j5xj-h9hc

## What is CVE-2026-55706?

CVE-2026-55706 is a medium-severity authentication bypass vulnerability in Openbsd Openbsd, published on 17 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.

Weakness: CWE-1284 (Improper Validation of Specified Quantity in Input)

## Which versions are affected by CVE-2026-55706?

It affects 1 product.


Products: Openbsd Openbsd.

## How do I fix CVE-2026-55706?

No fix has been published for CVE-2026-55706 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-55706 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55706 exists.

## Other vulnerabilities in Openbsd Openbsd

- [CVE-2007-1365](https://insights.sbomify.com/CVE-2007-1365/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0220](https://insights.sbomify.com/CVE-2004-0220/): Integer overflow in n/a (critical 10.0)
- [CVE-2004-0083](https://insights.sbomify.com/CVE-2004-0083/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0084](https://insights.sbomify.com/CVE-2004-0084/): Memory corruption in n/a (critical 10.0)
- [CVE-2001-0284](https://insights.sbomify.com/CVE-2001-0284/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-55706 and fix it if it is affected.

What it is: CVE-2026-55706 is a medium-severity authentication bypass vulnerability in Openbsd Openbsd, published on 17 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55706 exists.

Affected product: Openbsd Openbsd. 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-2026-55706/ (Markdown: https://insights.sbomify.com/CVE-2026-55706/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-55706
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-55706
- OSV: https://osv.dev/vulnerability/CVE-2026-55706

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-55706/
Summaries are generated and may contain mistakes; the official description above is the record.