CVE-2026-41643: GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language

Q: How do I fix CVE-2026-41643?

gobgp: upgrade to 4.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41643 being exploited?

CVE-2026-41643 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41643 affect?

CVE-2026-41643 affects gobgp. Severity is high (CVSS 7.5). 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 r

Q: How urgent is CVE-2026-41643?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-41643 is a high-severity flaw (CVSS 7.5) affecting gobgp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 bee

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-129
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: osrg

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 12:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

osrg gobgp UPGRADE

Affected: < 4.3.0

Fixed in: 4.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gobgp || rpm -q gobgp || gobgp --version

2. UPGRADE to 4.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gobgp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gobgp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41643?

gobgp: upgrade to 4.3.0. Exact commands for each OS are on this page.

Is CVE-2026-41643 being exploited?

CVE-2026-41643 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41643 affect?

CVE-2026-41643 affects gobgp. Severity is high (CVSS 7.5). 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 r

How urgent is CVE-2026-41643?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41642 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-42285 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-7736 HIGH 7.3 UPGRADE A vulnerability was determined in osrg GoBGP up to 4.3.0
CVE-2026-7735 HIGH 7.3 UPGRADE A vulnerability was found in osrg GoBGP up to 4.3.0
CVE-2026-7737 MEDIUM 5.3 UPGRADE A vulnerability was identified in osrg GoBGP up to 4.3.0

References

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