CVE-2026-73064 In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into
Low 2.9
Published
Updated
Check this codebase for CVE-2026-73064 and fix it if it is affected.
What it is: CVE-2026-73064 is a low-severity vulnerability in trustedfirmware Mbed TLS, published on 24 Sep 2026.
Exploitation: There is no known exploitation of CVE-2026-73064 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-2026-73064/ (Markdown: https://insights.sbomify.com/CVE-2026-73064/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-73064?
CVE-2026-73064 is a low-severity vulnerability in trustedfirmware Mbed TLS, published on 24 Sep 2026.
Official description
In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.
Weakness: CWE-394
Which versions are affected by CVE-2026-73064?
How do I fix CVE-2026-73064?
Upgrade to a fixed version.
Is CVE-2026-73064 being exploited?
There is no known exploitation of CVE-2026-73064 in the wild and no public exploit code.
Sources
Also known as AZL-105561, AZL-105705, DEBIAN-CVE-2026-73064, ECHO-3fff-6d78-3cec, GHSA-crc8-r3c8-83vw, UBUNTU-CVE-2026-73064.