Vulnerability · Published May 4, 2026 · Assigned by VulDB

CVE-2026-7736osrg GoBGP mrt.go parseRibEntry integer underflow

High 7.3

In plain English

A high-severity security flaw in GoBGP from osrg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.5%top 60.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	gobgp	no fix listed	DEBIAN-CVE-2026-7736
Debian:13	gobgp	no fix listed	DEBIAN-CVE-2026-7736
Debian:14	gobgp	4.4.0-1	DEBIAN-CVE-2026-7736
Go	github.com/osrg/gobgp/v4	4.4.0	GHSA-hj4w-qr9j-c4cf
Go	github.com/osrg/gobgp/v4	4.4.0	GO-2026-5427
Ubuntu:25.10	gobgp	no fix listed	UBUNTU-CVE-2026-7736

Affected products (as reported)

Vendor	Product	Versions
osrg	GoBGP	4.04.14.24.3.0

Weakness: CWE-191, CWE-189 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

References

VDB-360911 | osrg GoBGP mrt.go parseRibEntry integer underflow vdb-entry, technical-description
VDB-360911 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #807604 | osrg GoBGP <= 4.3.0 Integer Underflow third-party-advisory
https://github.com/osrg/gobgp/commit/76d911046344a3923cbe573364197aa081944592 patch
https://github.com/osrg/gobgp/releases/tag/v4.4.0 patch
https://github.com/osrg/gobgp/ product