# CVE-2026-7734: osrg GoBGP SRv6 L3 Service prefix_sid.go SRv6L3ServiceAttribute.DecodeFromBytes denial of service


- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 4 May 2026
- **Updated:** 4 May 2026
- **Also known as:** DEBIAN-CVE-2026-7734, GHSA-vm3g-8xwv-mxfp, GO-2026-5665, UBUNTU-CVE-2026-7734

## What is CVE-2026-7734?

CVE-2026-7734 is a medium-severity vulnerability in osrg GoBGP, published on 4 May 2026. 

### Official description

A vulnerability has been found in osrg GoBGP up to 4.3.0. This impacts the function SRv6L3ServiceAttribute.DecodeFromBytes of the file pkg/packet/bgp/prefix_sid.go of the component SRv6 L3 Service. Such manipulation of the argument data leads to denial of service. The attack may be performed from remote. Upgrading to version 4.4.0 will fix this issue. The name of the patch is f9f7b55ec258e514be0264871fa645a2c3edad11. You should upgrade the affected component.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-7734?

3 open source packages ship an affected version, including github.com/osrg/gobgp/v4. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/osrg/gobgp/v4` | Go | All versions | 4.4.0 |
| `github.com/osrg/gobgp/v4` | Go | All versions | 4.4.0 |
| `github.com/osrg/gobgp/v4` | Go | All versions | 4.4.0 |

Products: Osrg Gobgp.

## How do I fix CVE-2026-7734?

Upgrade github.com/osrg/gobgp/v4 to 4.4.0 or later.

## Is CVE-2026-7734 being exploited?

There is no known exploitation of CVE-2026-7734 in the wild and no public exploit code.

## Other vulnerabilities in osrg GoBGP

- [CVE-2025-43971](https://insights.sbomify.com/CVE-2025-43971/): GoBGP panics due to a zero value for softwareVersionLen (high 8.6)
- [CVE-2026-41642](https://insights.sbomify.com/CVE-2026-41642/): GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute (high 7.5)
- [CVE-2026-41643](https://insights.sbomify.com/CVE-2026-41643/): GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE (high 7.5)
- [CVE-2026-42285](https://insights.sbomify.com/CVE-2026-42285/): GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference) (high 7.5)
- [CVE-2026-37461](https://insights.sbomify.com/CVE-2026-37461/): GoBGP has an out-of-bounds read in the ParseIP6Extended function (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7734 and fix it if it is affected.

What it is: CVE-2026-7734 is a medium-severity vulnerability in osrg GoBGP, published on 4 May 2026. 
Exploitation: There is no known exploitation of CVE-2026-7734 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.4.0
- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.4.0
- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.4.0

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-2026-7734/ (Markdown: https://insights.sbomify.com/CVE-2026-7734/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7734
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7734
- OSV: https://osv.dev/vulnerability/CVE-2026-7734

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7734/
Summaries are generated and may contain mistakes; the official description above is the record.