# CVE-2025-11934: Improper Validation of Signature Algorithm Used in TLS 1.3 CertificateVerify


- **Severity:** Low 2.1 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 21 Nov 2025
- **Updated:** 8 Dec 2025
- **Also known as:** DEBIAN-CVE-2025-11934, GHSA-wq2x-6c88-jrh3, UBUNTU-CVE-2025-11934

## What is CVE-2025-11934?

CVE-2025-11934 is a low-severity vulnerability in Wolfssl Wolfssl, published on 21 Nov 2025. 

### Official description

Improper input validation in the TLS 1.3 CertificateVerify signature algorithm negotiation in wolfSSL 5.8.2 and earlier on multiple platforms allows for downgrading the signature algorithm used. For example when a client sends ECDSA P521 as the supported signature algorithm the server previously could respond as ECDSA P256 being the accepted signature algorithm and the connection would continue with using ECDSA P256, if the client supports ECDSA P256.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2025-11934?

It affects 1 product.


Products: Wolfssl Wolfssl.

## How do I fix CVE-2025-11934?

No fix has been published for CVE-2025-11934 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-11934 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-11934 exists.

## 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-2025-11934 and fix it if it is affected.

What it is: CVE-2025-11934 is a low-severity vulnerability in Wolfssl Wolfssl, published on 21 Nov 2025. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-11934 exists.

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-2025-11934/ (Markdown: https://insights.sbomify.com/CVE-2025-11934/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-11934
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-11934
- OSV: https://osv.dev/vulnerability/CVE-2025-11934

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-11934/
Summaries are generated and may contain mistakes; the official description above is the record.