CVE catalog
CVE-2026-41643
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 malf
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.54% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | gobgp | sid | 4.8.0-1 | fixed |
| Debian | gobgp | forky | 4.8.0-1 | fixed |
| Debian | gobgp | trixie | 3.36.0-2 | vulnerable |
| Debian | gobgp | bookworm | 3.10.0-1 | vulnerable |
| Cpe | gobgp | Not reported | 3.23.0-1ubuntu0.3+esm4 | fixed |
| Cpe | gobgpd | Not reported | 3.23.0-1ubuntu0.3+esm4 | fixed |
| Cpe | golang-github-osrg-gobgp-dev | Not reported | 3.23.0-1ubuntu0.3+esm4 | fixed |
| Cpe | gobgp | Not reported | Not reported | vulnerable |
| Cpe | gobgp | Not reported | 4.3.0 | fixed |
| Go | github.com/osrg/gobgp/v4 | Not reported | 4.3.0 | fixed |
| Ubuntu | gobgp | pro | 3.36.0-2 | vulnerable |
| Ubuntu | gobgp | pro | 3.36.0-2build1 | vulnerable |
| Ubuntu | gobgp | pro | 3.36.0-2ubuntu0.1~esm1 | fixed |
| Ubuntu | gobgp | 25.10 | 3.35.0-1 | vulnerable |
| Ubuntu | gobgp | 25.10 | 3.36.0-2 | vulnerable |
| Cpe | gobgp | Not reported | 4.3.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | gobgp | source | sid | 4.3.0-1 | not yet assigned | Not reported | Not reported |
| Debian | gobgp | source | forky | 4.3.0-1 | not yet assigned | Not reported | Not reported |
| Debian | gobgp | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | gobgp | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | gobgp | cpe | Not reported | 3.23.0-1ubuntu0.3+esm4 | Not reported | Not reported | Not reported |
| Cpe | gobgpd | cpe | Not reported | 3.23.0-1ubuntu0.3+esm4 | Not reported | Not reported | Not reported |
| Cpe | golang-github-osrg-gobgp-dev | cpe | Not reported | 3.23.0-1ubuntu0.3+esm4 | Not reported | Not reported | Not reported |
| Cpe | gobgp | cpe | Not reported | 4.3.0 | Not reported | Not reported | Not reported |
| Go | github.com/osrg/gobgp/v4 | Go | Not reported | 4.3.0 | Not reported | Not reported | Not reported |
| Ubuntu | gobgp | deb | pro | 3.36.0-2ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2026-41643 | Not reported |
| Cpe | gobgp | cpe | Not reported | 4.3.0 | Not reported | NVD-CVE-2026-41643 | Not reported |
Notes
[trixie] gobgp: Minor issue [bookworm] gobgp: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [gobgpd]Affected
Source package: [gobgp]
Details (2)
3.10.0-1+b4· amd64 · bookwormAffected
nvd · gobgp · debian · bookworm; nvd · gobgp · debian · 12
3.10.0-1+b4· arm64 · bookwormAffected
nvd · gobgp · debian · bookworm; nvd · gobgp · debian · 12
- [golang-github-osrg-gobgp-dev]Affected
Source package: [gobgp]
Details (2)
3.10.0-1· all · bookwormAffected
nvd · gobgp · debian · bookworm; nvd · gobgp · debian · 12
3.10.0-1· all · bookwormAffected
nvd · gobgp · debian · bookworm; nvd · gobgp · debian · 12
[Debian 13 (Trixie)]
- [gobgpd]Affected
Source package: [gobgp]
Details (4)
3.36.0-2+b3· amd64 · trixieAffected
nvd · gobgp · debian · 13
3.36.0-2+b3· arm64 · trixieAffected
nvd · gobgp · debian · 13
4.7.0-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · gobgp · debian · 13
4.7.0-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · gobgp · debian · 13
- [golang-github-osrg-gobgp-dev]Affected
Source package: [gobgp]
Details (4)
3.36.0-2· all · trixieAffected
nvd · gobgp · debian · 13
3.36.0-2· all · trixieAffected
nvd · gobgp · debian · 13
4.7.0-1~bpo13+1· all · trixie-backportsAffected
nvd · gobgp · debian · 13
4.7.0-1~bpo13+1· all · trixie-backportsAffected
nvd · gobgp · debian · 13
Observed:
References
- [https://github.com/osrg/gobgp/releases/tag/v4.3.0]
- [https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-41643]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-41643]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-41643]
- [https://pkg.go.dev/vuln/GO-2026-5266]
- [https://security-tracker.debian.org/tracker/CVE-2026-41643]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41643.json]
- [https://ubuntu.com/security/notices/USN-8348-1]
[Debian Security Tracker] · [FIRST EPSS] · [Go Vulnerability Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]