CVE-2026-37462Public exploitNetwork attack vector

BGP service interruption via unchecked length subtraction

Published Jun 3, 2026 · Updated Jun 3, 2026

Integer underflow in GoBGP before 4.4.0 allows remote attackers to interrupt the BGP service with a crafted BGP UPDATE message. BGPUpdate.DecodeFromBytes subtracts an encoded route or path-attribute length from a smaller uint16 section length without checking the boundary, wrapping the counter and consuming data beyond the declared section. Reachability requires the GoBGP process to accept the crafted UPDATE from a network BGP peer; the result is a routing-service interruption without a grounded confidentiality or integrity effect.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in GoBGP before 4.4.0 allows remote attackers to interrupt the BGP service with a crafted BGP UPDATE message. BGPUpdate.DecodeFromBytes subtracts an encoded route or path-attribute length from a smaller uint16 section length without checking the boundary, wrapping the counter and consuming data beyond the declared section. Reachability requires the GoBGP process to accept the crafted UPDATE from a network BGP peer; the result is a routing-service interruption without a grounded confidentiality or integrity effect.

The record

CVE
CVE-2026-37462
Published
Jun 3, 2026
Updated
Jun 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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