# CVE-2026-1584: Gnutls: gnutls: remote denial of service via crafted clienthello with invalid psk binder

> Remote attackers can crash TLS servers by sending crafted ClientHello messages with invalid PSK binders, causing a denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Apr 2026
- **Updated:** 1 Sep 2026
- **Also known as:** ALPINE-CVE-2026-1584, BELL-CVE-2026-1584, DEBIAN-CVE-2026-1584, GHSA-92xv-mw29-x4px

## What is CVE-2026-1584?

CVE-2026-1584 is a high-severity vulnerability in Gnu Gnutls, published on 9 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in gnutls. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted ClientHello message with an invalid Pre-Shared Key (PSK) binder value during the TLS handshake. This can lead to a NULL pointer dereference, causing the server to crash and resulting in a remote Denial of Service (DoS) condition.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-1584?

It affects 2 products.


Products: Gnu Gnutls, Redhat Hardened Images.

## How do I fix CVE-2026-1584?

Apply the vendor's patch.

## Is CVE-2026-1584 being exploited?

There is no known exploitation of CVE-2026-1584 in the wild and no public exploit code.

## Other vulnerabilities in Gnu Gnutls

- [CVE-2008-1948](https://insights.sbomify.com/CVE-2008-1948/): Memory corruption in n/a (critical 10.0)
- [CVE-2017-5334](https://insights.sbomify.com/CVE-2017-5334/): Use after free in n/a (critical 9.8)
- [CVE-2017-5336](https://insights.sbomify.com/CVE-2017-5336/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-5337](https://insights.sbomify.com/CVE-2017-5337/): Memory corruption in n/a (critical 9.8)
- [CVE-2008-1949](https://insights.sbomify.com/CVE-2008-1949/): Null dereference in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1584 and fix it if it is affected.

What it is: CVE-2026-1584 is a high-severity vulnerability in Gnu Gnutls, published on 9 Apr 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-2026-1584 in the wild and no public exploit code.

Affected product: Gnu Gnutls. 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-2026-1584/ (Markdown: https://insights.sbomify.com/CVE-2026-1584/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1584
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1584
- OSV: https://osv.dev/vulnerability/CVE-2026-1584

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1584/
Summaries are generated and may contain mistakes; the official description above is the record.