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.
Low 3.7
Published
Updated
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)
- Exploited in the wild
- Not known
- Fix
- Available
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
Which versions are affected by CVE-2026-25832?
Linux distribution packages (1)
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.
Sources
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 and 1 more.