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MEDIUM severity

GoBGP crashes in the flowspec parserGHSA-mfvv-mgf6-q25r

MEDIUMFix: osrg/gobgp@ca7383f

GHSA-mfvv-mgf6-q25r is a medium-severity (CVSS 6.8) CWE-1284 vulnerability in github.com/osrg/gobgp. A fix is available for github.com/osrg/gobgp — see the affected versions and patch details below.

Also known asCVE-2025-43972GO-2025-3632
Published
Updated
Affected
2 pkgs
Patched
1 / 2
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-mfvv-mgf6-q25r.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk
0.00%0.35%0.71%1.06%0.1%0.6%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐹github.com/osrg/gobgp🐹github.com/osrg/gobgp/v3

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 bytes in a certain context.

Affected Packages

2 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/osrg/gobgpall versionsNo fix
🐹Gogithub.com/osrg/gobgp/v3all versions3.35.0go get github.com/osrg/gobgp/v3@v3.35.0

Affected Products

1 product · 1 configurations
Application
gobgposrg
< 3.35.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/osrg/gobgp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    A fix is available for GHSA-mfvv-mgf6-q25r; check the affected-versions list above or the advisory for the patched release of github.com/osrg/gobgp, then make sure no transitive dependency still pins the vulnerable range.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

UbuntuMEDIUM
USN-7661-1Ubuntu

Frequently Asked Questions

An issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 bytes in a certain context.
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GoBGP crashes in the flowspec parser (Medium 6.8)