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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.

PUBLISHED Reserved 2026-03-30 | Published 2026-03-30 | Updated 2026-04-01 | Assigner VulDB




MEDIUM: 6.3CVSS: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
LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
LOW: 3.7CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
2.6AV:N/AC:H/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C

Problem types

Off-by-One

Numeric Error

Product status

4.0
affected

4.1
affected

4.2
affected

4.3.0
affected

Timeline

2026-03-30:Advisory disclosed
2026-03-30:VulDB entry created
2026-03-30:VulDB entry last update

Credits

Sunxj (VulDB User) reporter

References

vuldb.com/vuln/354155 (VDB-354155 | osrg GoBGP bgp.go DecodeFromBytes off-by-one) vdb-entry technical-description

vuldb.com/vuln/354155/cti (VDB-354155 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/780179 (Submit #780179 | osrg GoBGP 4.3.0 Off-by-one Error) third-party-advisory

github.com/osrg/gobgp/pull/3342 issue-tracking patch

github.com/...ommit/67c059413470df64bc20801c46f64058e88f800f patch

github.com/osrg/gobgp/ product

cve.org (CVE-2026-5123)

nvd.nist.gov (CVE-2026-5123)

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