CVE-2026-37462 GoBGP: Integer underflow in the BGPUpdate.DecodeFromBytes function
Attackers can cause a Denial of Service in the gobgp library by sending a crafted BGP UPDATE message that triggers an integer underflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-37462?
CVE-2026-37462 is a high-severity vulnerability in n/a, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An integer underflow in the BGPUpdate.DecodeFromBytes function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.
Weakness: CWE-190
Which versions are affected by CVE-2026-37462?
3 open source packages ship an affected version, including github.com/osrg/gobgp/v4.
| Package | 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 |
How do I fix CVE-2026-37462?
Upgrade github.com/osrg/gobgp/v4 to 4.4.0 or later.
Is CVE-2026-37462 being exploited?
There is no known exploitation of CVE-2026-37462 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-37462, GHSA-pw7p-7fqv-hpj8, GO-2026-5971, UBUNTU-CVE-2026-37462.