How severe is CVE-2026-5123?

CVE-2026-5123 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-5123 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5123?

CVE-2026-5123 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5123?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5123 have an EU (EUVD) identifier?

Yes. CVE-2026-5123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17109.

When was CVE-2026-5123 published?

CVE-2026-5123 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-5123

CVE-2026-5123 is a low-severity vulnerability in Osrg Gobgp with a CVSS 3.x base score of 3.7. 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-189.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
CVSS v2: 2.6
CVSS v4: 6.3
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17109
Weakness: CWE-189
Affected product: Osrg Gobgp
Published: 2026-03-30
Last modified: 2026-06-17

Description

A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate this issue.

Frequently asked questions

What is CVE-2026-5123?: A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate this issue.
How severe is CVE-2026-5123?: CVE-2026-5123 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-5123 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5123?: CVE-2026-5123 affects Osrg Gobgp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5123?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5123 have an EU (EUVD) identifier?: Yes. CVE-2026-5123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17109.
When was CVE-2026-5123 published?: CVE-2026-5123 was published on 2026-03-30 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Osrg Gobgp

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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,…
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All CVEs affecting Osrg Gobgp →

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