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CVE-2026-41643

Osrg Gobgp vulnerability

7.5 HIGHPublic exploitEPSS 0.60%
  1. Published7 May 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Osrg Gobgp< 4.3.0

Remediation

Fixed in
Osrg Gobgp≥ 4.3.0

References

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Frequently asked

Is CVE-2026-41643 being actively exploited?

CVE-2026-41643 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.60%.

How severe is CVE-2026-41643?

CVE-2026-41643 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.60% probability of exploitation.

Which products are affected by CVE-2026-41643?

Affected products include Osrg Gobgp.

How do I fix CVE-2026-41643?

Upgrade affected software to a fixed version, for example Osrg Gobgp 4.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-41643 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.