How severe is CVE-2026-41643?

CVE-2026-41643 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-41643 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41643?

CVE-2026-41643 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41643?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-41643 have an EU (EUVD) identifier?

Yes. CVE-2026-41643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28352.

When was CVE-2026-41643 published?

CVE-2026-41643 was published on 2026-05-07 and last updated on 2026-06-17.

CVE-2026-41643

CVE-2026-41643 is a high-severity vulnerability in Osrg Gobgp with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-129.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28352
Weakness: CWE-129
Affected product: Osrg Gobgp
Published: 2026-05-07
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-41643?: CVE-2026-41643 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-41643 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41643?: CVE-2026-41643 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-41643 have an EU (EUVD) identifier?: Yes. CVE-2026-41643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28352.
When was CVE-2026-41643 published?: CVE-2026-41643 was published on 2026-05-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:*

More vulnerabilities in Osrg Gobgp

CVE-2025-43971 — High (CVSS 8.6): An issue was discovered in GoBGP before 3.35.0. pkg/packet/bgp/bgp.go allows attackers to cause a panic via a zero…
CVE-2026-42285 — High (CVSS 7.5): GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0,…
CVE-2026-41642 — High (CVSS 7.5): GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0,…
CVE-2026-37461 — High (CVSS 7.5): An out-of-bounds read in the ParseIP6Extended function (/bgp/bgp.go) of gobgp v4.3.0 allows attackers to cause a Denial…
CVE-2026-30405 — High (CVSS 7.5): An issue in GoBGP gobgpd v.4.2.0 allows a remote attacker to cause a denial of service via the NEXT_HOP path attribute
CVE-2026-7736 — High (CVSS 7.3): A vulnerability was determined in osrg GoBGP up to 4.3.0. Affected by this vulnerability is the function parseRibEntry…

All CVEs affecting Osrg Gobgp →

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