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TI-2026-04473 Aliases CVE-2026-5123GHSA-m763-9mqf-95rq

osrg GoBGP bgp.go DecodeFromBytes off-by-one

Priority LOW 28CWE-189Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00425 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
osrgGoBGP4.0; 4.1; 4.2; 4.3.0—No fix listedCNA
  • GoBGP Vendorosrg Affected 4.0; 4.1; 4.2; 4.3.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:*before 4.4.0Vulnerableosrg
  • cpe:2.3:a:osrg:gobgp:*:*:*:*:*:*:*:* Versions before 4.4.0 Vulnerable ·osrg

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5123
  2. 2026-10-03 Alias added: GHSA-m763-9mqf-95rq
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 2

Other 1

  • TI-2026-30596 GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference) CVSS 3.1HIGH 7.5
  • TI-2026-30162 GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE CVSS 3.1HIGH 7.5
  • TI-2026-30161 GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute CVSS 3.1HIGH 7.5
  • TI-2026-23526 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 CVSS 3.1HIGH 7.5
  • TI-2025-28529 An issue was discovered in GoBGP before 3.35.0. CVSS 3.1HIGH 8.6
  • TI-2025-28531 An issue was discovered in GoBGP before 3.35.0. CVSS 3.1CRITICAL 9.8
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences