CVE-2026-5123 | osrg GoBGP up to 4.3.0 pkg/packet/bgp/bgp.go DecodeFromBytes data[1] off-by-one (ID 3342)

VDB-354155 · CVE-2026-5123 · ID 3342 OSRG GOBGP UP TO 4.3.0 PKG/PACKET/BGP/BGP.GO DECODEFROMBYTES DATA[1] OFF-BY-ONE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.6 $0-$5k 2.11 Summaryinfo A vulnerability marked as problematic has been reported in osrg GoBGP up to 4.3.0. Affected is the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. The manipulation of the argument data[1] leads to off-by-one. This vulnerability is referenced as CVE-2026-5123. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch. Detailsinfo A vulnerability was found in osrg GoBGP up to 4.3.0 and classified as problematic. This issue affects the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. The manipulation of the argument data[1] with an unknown input leads to a off-by-one vulnerability. Using CWE to declare the problem leads to CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. Impacted is availability. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-5123. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. Applying the patch 67c059413470df64bc20801c46f64058e88f800f is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Vendor osrg Name GoBGP Version 4.0 4.1 4.2 4.3.0 License open-source Website Product: https://github.com/osrg/gobgp/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.7 VulDB Meta Temp Score: 3.6 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Off-by-one CWE: CWE-193 / CWE-189 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 67c059413470df64bc20801c46f64058e88f800f Timelineinfo 03/30/2026 Advisory disclosed 03/30/2026 +0 days VulDB entry created 03/30/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: 3342 Status: Confirmed CVE: CVE-2026-5123 (🔒) GCVE (CVE): GCVE-0-2026-5123 GCVE (VulDB): GCVE-100-354155 Entryinfo Created: 03/30/2026 09:55 Changes: 03/30/2026 09:55 (57) Complete: 🔍 Submitter: Sunxj Cache ID: 99:8C2:101 Submitinfo Accepted Submit #780179: osrg GoBGP 4.3.0 Off-by-one Error (by Sunxj) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸