CVE-2026-7736

osrg GoBGP mrt.go parseRibEntry integer underflow

State: Published
Severity: 6.9 Medium
Published: May 4, 2026
Updated: May 4, 2026
Reserved: May 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X	VulDB
3.1	7.3 High	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	VulDB
3.0	7.3 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C	VulDB
2.0	7.5 High	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C	VulDB

Weaknesses

CWE-191 Integer Underflow
CWE-189 Numeric Error

Affected Products

Product	Versions
GoBGPosrg	4.0Affected 4.1Affected 4.2Affected 4.3.0Affected 4.4.0Not affected

References

VDB-360911 | osrg GoBGP mrt.go parseRibEntry integer underflowvdb-entrytechnical-description
VDB-360911 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #807604 | osrg GoBGP <= 4.3.0 Integer Underflowthird-party-advisory
https://github.com/osrg/gobgp/commit/76d911046344a3923cbe573364197aa081944592patch
https://github.com/osrg/gobgp/releases/tag/v4.4.0patch
https://github.com/osrg/gobgp/product

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