CVE catalog
CVE-2026-49838
gobgp: CVE-2026-49838
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.41% · Oct 25, 2026
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked `p.Value[0]` access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 patches the issue.
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 |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | gobgp | source | sid | 4.7.0-1 | not yet assigned | Not reported | Not reported |
| Debian | gobgp | source | forky | 4.7.0-1 | 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 |
Notes
[trixie] gobgp: Minor issue [bookworm] gobgp: Minor issue, DoS via empty AS_PATH in confed eBGP validation
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [gobgpd]Affected
Source package: [gobgp]
Details (2)
3.10.0-1+b4· amd64 · bookwormAffected
dsa · gobgp · debian · bookworm; dsa · gobgp · debian · 12
3.10.0-1+b4· arm64 · bookwormAffected
dsa · gobgp · debian · bookworm; dsa · gobgp · debian · 12
- [golang-github-osrg-gobgp-dev]Affected
Source package: [gobgp]
Details (2)
3.10.0-1· all · bookwormAffected
dsa · gobgp · debian · bookworm; dsa · gobgp · debian · 12
3.10.0-1· all · bookwormAffected
dsa · gobgp · debian · bookworm; dsa · gobgp · debian · 12
[Debian 13 (Trixie)]
- [gobgpd]Affected
Source package: [gobgp]
Details (4)
3.36.0-2+b3· amd64 · trixieAffected
dsa · gobgp · debian · 13
3.36.0-2+b3· arm64 · trixieAffected
dsa · gobgp · debian · 13
4.7.0-1~bpo13+1· amd64 · trixie-backportsAffected
dsa · gobgp · debian · 13
4.7.0-1~bpo13+1· arm64 · trixie-backportsAffected
dsa · gobgp · debian · 13
- [golang-github-osrg-gobgp-dev]Affected
Source package: [gobgp]
Details (4)
3.36.0-2· all · trixieAffected
dsa · gobgp · debian · 13
3.36.0-2· all · trixieAffected
dsa · gobgp · debian · 13
4.7.0-1~bpo13+1· all · trixie-backportsAffected
dsa · gobgp · debian · 13
4.7.0-1~bpo13+1· all · trixie-backportsAffected
dsa · gobgp · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-49838]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-49838]
- [https://security-tracker.debian.org/tracker/CVE-2026-49838]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49838.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]