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.
Casky was already ahead
This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-7736 is an integer underflow vulnerability in osrg GoBGP versions up to 4.3.0, specifically within the MRT (Multi-threaded Routing Toolkit) packet parsing function. This vulnerability affects the parseRibEntry function in pkg/packet/mrt/mrt.go, allowing remote attackers to manipulate packet data and trigger integer underflow conditions. GoBGP is widely used in network infrastructure for BGP routing protocol implementation, making this vulnerability critical for operators managing large-scale network environments. Organizations running affected versions face risks including denial of service, potential memory corruption, or unexpected application behavior when processing specially crafted BGP MRT packets from network feeds or monitoring systems.
While this CVE currently shows 0 matching Casky skills and no mapped MITRE ATT&CK techniques, practitioners should monitor for attack patterns involving network protocol exploitation and resource exhaustion. Casky's Claude AI-powered analysis would help detect suspicious MRT packet processing behaviors, unusual memory allocation patterns near the vulnerable code path, or unexpected application crashes during BGP route table updates. Security teams should prioritize upgrading to GoBGP 4.4.0 (patch 76d911046344a3923cbe573364197aa081944592) and implement network segmentation to restrict BGP route collector access, as the remote attack vector poses significant risk to routing infrastructure stability and integrity.
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