CVE-2026-41643

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.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.15%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-129 CWE-129

Affected Products

Vendor	Product	Versions
osrg	gobgp	< 4.3.0

References

Advisories & Patches

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

Exploits

https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-41643? +

CVE-2026-41643 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41643? +

CVE-2026-41643 affects products from osrg, specifically: gobgp. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41643? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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