# CVE-2026-25832: In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.


- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 14 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** ALPINE-CVE-2026-25832, AZL-103380, DEBIAN-CVE-2026-25832, ECHO-ba09-b99b-c297, GHSA-583p-89c4-mqq9, UBUNTU-CVE-2026-25832, openSUSE-SU-2026:21865-1

## What is CVE-2026-25832?

CVE-2026-25832 is a low-severity vulnerability in TrustedFirmware Mbed TLS, published on 14 Sep 2026. 

### Official description

In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.

Weakness: CWE-669 (Incorrect Resource Transfer Between Spheres)

## Which versions are affected by CVE-2026-25832?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `mbedtls` | openSUSE:Leap 16.0 | All versions | 3.6.7-bp160.1.1 |

## How do I fix CVE-2026-25832?

Upgrade to a fixed version.

## Is CVE-2026-25832 being exploited?

There is no known exploitation of CVE-2026-25832 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25832 and fix it if it is affected.

What it is: CVE-2026-25832 is a low-severity vulnerability in TrustedFirmware Mbed TLS, published on 14 Sep 2026. 
Exploitation: There is no known exploitation of CVE-2026-25832 in the wild and no public exploit code.

Affected product: TrustedFirmware Mbed TLS. 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-2026-25832/ (Markdown: https://insights.sbomify.com/CVE-2026-25832/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25832
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25832
- OSV: https://osv.dev/vulnerability/CVE-2026-25832

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25832/
Summaries are generated and may contain mistakes; the official description above is the record.