CVE-2026-37461Network attack vector

Service interruption via short IPv6 extended community

Published May 4, 2026 · Updated May 4, 2026

Out-of-bounds read in GoBGP before 4.4.0 allows remote attackers to interrupt the routing service with a crafted BGP UPDATE message. ParseIP6Extended accepts an eight-byte buffer even though IPv6 extended-community parsing reads 20 bytes, permitting reads past the supplied data. A reachable BGP service is required, but the upstream patch states that the sole internal caller already enforces the 20-byte minimum, making this path unreachable in normal builds.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in GoBGP before 4.4.0 allows remote attackers to interrupt the routing service with a crafted BGP UPDATE message. ParseIP6Extended accepts an eight-byte buffer even though IPv6 extended-community parsing reads 20 bytes, permitting reads past the supplied data. A reachable BGP service is required, but the upstream patch states that the sole internal caller already enforces the 20-byte minimum, making this path unreachable in normal builds.

The record

CVE
CVE-2026-37461
Published
May 4, 2026
Updated
May 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 4, 2026CVE publishedPublication date reported by the CVE source.
  2. May 4, 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

7.5CISA-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 exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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