# CVE-2025-31335: Security feature bypass in OpenSAML C++ library

> Attackers can forge signed SAML messages in OpenSAML C++ library when using non-XML signature bindings, bypassing authentication integrity checks.

- **Severity:** Medium 4.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Mar 2025
- **Updated:** 28 Mar 2025
- **Also known as:** DEBIAN-CVE-2025-31335, DLA-4093-1, DSA-5879-1, GHSA-8f4c-9gmv-rfm8, SUSE-SU-2025:01500-1, SUSE-SU-2025:1500-1, SUSE-SU-2025:1501-1, UBUNTU-CVE-2025-31335, openSUSE-SU-2025:14959-1

## What is CVE-2025-31335?

CVE-2025-31335 is a medium-severity vulnerability in Shibboleth OpenSAML C++ library, published on 28 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The OpenSAML C++ library before 3.3.1 allows forging of signed SAML messages via parameter manipulation (when using SAML bindings that rely on non-XML signatures).

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2025-31335?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `opensaml` | SUSE:Linux Enterprise Module for Server Applications 15 SP6 | All versions | 3.1.0-150300.3.3.1 |
| `opensaml` | SUSE:Linux Enterprise Module for Server Applications 15 SP7 | All versions | 3.1.0-150300.3.3.1 |
| `opensaml` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 2.5.5-3.6.1 |
| `opensaml` | openSUSE:Leap 15.6 | All versions | 3.1.0-150300.3.3.1 |
| `opensaml` | openSUSE:Tumbleweed | All versions | 3.3.1-2.1 |

## How do I fix CVE-2025-31335?

Upgrade to a fixed version.

## Is CVE-2025-31335 being exploited?

There is no known exploitation of CVE-2025-31335 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-31335 and fix it if it is affected.

What it is: CVE-2025-31335 is a medium-severity vulnerability in Shibboleth OpenSAML C++ library, published on 28 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-31335 in the wild and no public exploit code.

Affected product: Shibboleth OpenSAML C++ library. 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-2025-31335/ (Markdown: https://insights.sbomify.com/CVE-2025-31335/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-31335
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-31335
- OSV: https://osv.dev/vulnerability/CVE-2025-31335

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-31335/
Summaries are generated and may contain mistakes; the official description above is the record.