CVE-2026-103393 Session Smart Router: An attacker can cause an out-of-bounds read during VRRP packet processing
Medium 4.3
Published
Updated
Check this codebase for CVE-2026-103393 and fix it if it is affected.
What it is: CVE-2026-103393 is a medium-severity vulnerability in Juniper Networks Session Smart Router, published on 28 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-103393 in the wild and no public exploit code.
Affected product: Juniper Networks Session Smart Router. 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-2026-103393/ (Markdown: https://insights.sbomify.com/CVE-2026-103393/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-103393?
CVE-2026-103393 is a medium-severity vulnerability in Juniper Networks Session Smart Router, published on 28 Oct 2026.
Official description
An Out-of-Bounds Read vulnerability in the VRRP implementation in Juniper Networks Session Smart Router allows an L2-adjacent attacker to read stale memory contents or cause a system fault via a specially crafted VRRPv3 advertisement.
Weakness: CWE-125
Which versions are affected by CVE-2026-103393?
How do I fix CVE-2026-103393?
No fix has been published for CVE-2026-103393 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103393 being exploited?
There is no known exploitation of CVE-2026-103393 in the wild and no public exploit code.
Sources
Also known as GHSA-m7g4-w7cp-5j93.