CVE-2026-7736 osrg GoBGP mrt.go parseRibEntry integer underflow
Remote attackers can trigger an integer underflow in GoBGP's MRT parser, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-7736?
CVE-2026-7736 is a medium-severity vulnerability in osrg GoBGP, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was determined in osrg GoBGP up to 4.3.0. Affected by this vulnerability is the function parseRibEntry of the file pkg/packet/mrt/mrt.go. Executing a manipulation can lead to integer underflow. It is possible to launch the attack remotely. Upgrading to version 4.4.0 addresses this issue. This patch is called 76d911046344a3923cbe573364197aa081944592. It is suggested to upgrade the affected component.
Which versions are affected by CVE-2026-7736?
3 open source packages ship an affected version, including github.com/osrg/gobgp/v4. It affects 1 product.
| 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 |
Products include Osrg Gobgp.
How do I fix CVE-2026-7736?
Upgrade github.com/osrg/gobgp/v4 to 4.4.0 or later.
Is CVE-2026-7736 being exploited?
There is no known exploitation of CVE-2026-7736 in the wild and no public exploit code.
Other vulnerabilities in osrg GoBGP
- CVE-2025-43971 GoBGP panics due to a zero value for softwareVersionLen
- CVE-2026-41642 GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
- CVE-2026-41643 GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
- CVE-2026-42285 GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)
- CVE-2026-37461 GoBGP has an out-of-bounds read in the ParseIP6Extended function
Sources
Also known as DEBIAN-CVE-2026-7736, GHSA-hj4w-qr9j-c4cf, GO-2026-5427, UBUNTU-CVE-2026-7736.