VulnerabilityAnalyzed

CVE-2026-5123

A weakness has been identified in osrg GoBGP up to 4.3.0.

MEDIUM 6.3EPSS 0.41%

Does this matter?

Lower severity and a low EPSS score (0.41%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 6.3 MEDIUMCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.41% probability · 34th percentile
CISA KEV: Not listed
Weakness: CWE-189, CWE-193
Affected: osrg/gobgp
Source: cna@vuldb.com

References

https://github.com/osrg/gobgp/Product
https://github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800fPatch
https://github.com/osrg/gobgp/pull/3342Issue Tracking
https://vuldb.com/submit/780179Third Party Advisory, VDB Entry
https://vuldb.com/vuln/354155Third Party Advisory, VDB Entry
https://vuldb.com/vuln/354155/ctiPermissions Required, VDB Entry

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.