# CVE-2026-11703: Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption

> Attackers can bypass authentication checks by resuming TLS sessions across different virtual hosts with differing client-authentication policies.

- **Severity:** Medium 6.0 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-11703, GHSA-q3px-vrjj-4f97, JLSEC-2026-698, UBUNTU-CVE-2026-11703

## What is CVE-2026-11703?

CVE-2026-11703 is a medium-severity authentication bypass vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the binding check performed for ticket-based resumption. A cached session could be resumed under a different SNI/ALPN than originally negotiated and, where client-authentication policy differs across virtual hosts, carry the cached peer-authentication state into a context it was not established for. Resumption now verifies the SNI/ALPN binding for all paths and declines (falling back to a full handshake) on mismatch.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-11703?

It affects 1 product.


Products: Wolfssl Wolfssl.

## How do I fix CVE-2026-11703?

Apply the vendor's patch.

## Is CVE-2026-11703 being exploited?

There is no known exploitation of CVE-2026-11703 in the wild and no public exploit code.

## Other vulnerabilities in Wolfssl Wolfssl

- [CVE-2024-5991](https://insights.sbomify.com/CVE-2024-5991/): Buffer overread in domain name matching (critical 10.0)
- [CVE-2021-37155](https://insights.sbomify.com/CVE-2021-37155/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-36177](https://insights.sbomify.com/CVE-2020-36177/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2896](https://insights.sbomify.com/CVE-2014-2896/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2897](https://insights.sbomify.com/CVE-2014-2897/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11703 and fix it if it is affected.

What it is: CVE-2026-11703 is a medium-severity authentication bypass vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11703 in the wild and no public exploit code.

Affected product: Wolfssl Wolfssl. 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-2026-11703/ (Markdown: https://insights.sbomify.com/CVE-2026-11703/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11703
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11703
- OSV: https://osv.dev/vulnerability/CVE-2026-11703

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11703/
Summaries are generated and may contain mistakes; the official description above is the record.