← Vulnerability feed

Vulnerability record · CVE-2026-41643 · published 7 May 2026

CVE-2026-41643: Osrg gobgp vulnerability

Osrg · Gobgp

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.

7.5 CVSS 3.1 High EPSS 0.61% · top 53.2% CWE-129 · CWE-129
7.5CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/osrg/gobgp/releases/tag/v4.3.0 PatchRelease Notes
https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q ExploitVendor Advisory
https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q ExploitVendor Advisory

Track CVE-2026-41643 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-43973Osrg gobgp vulnerabilityAn issue was discovered in GoBGP before 3.35.0. pkg/packet/rtr/rtr.go does not verify that the input length corresponds to a situation in which all b…EPSS 0.56%7.5CVE-2026-42285Osrg gobgp null pointer dereference vulnerabilityGoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0, an unauthenticated remote BGP …EPSS 0.61%7.5CVE-2026-41642Osrg gobgp null pointer dereference vulnerabilityGoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (Do…EPSS 0.61%7.5CVE-2026-37461Osrg gobgp out-of-bounds read vulnerabilityAn out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial of Service (DoS) via supplyin…EPSS 0.61%7.5CVE-2026-30405Osrg gobgp uncontrolled resource consumption vulnerabilityAn issue in GoBGP gobgpd v.4.2.0 allows a remote attacker to cause a denial of service via the NEXT_HOP path attributeEPSS 0.55%7.5CVE-2025-43971Osrg gobgp vulnerabilityAn issue was discovered in GoBGP before 3.35.0. pkg/packet/bgp/bgp.go allows attackers to cause a panic via a zero value for softwareVersionLen.EPSS 0.55%7.5CVE-2025-43972Osrg gobgp vulnerabilityAn issue was discovered in GoBGP before 3.35.0. An attacker can cause a crash in the pkg/packet/bgp/bgp.go flowspec parser by sending fewer than 20 b…EPSS 0.55%6.9CVE-2026-7736Osrg gobgp vulnerabilityA 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…EPSS 0.63%

Source: NIST National Vulnerability Database (record CVE-2026-41643), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.