CVE-2026-7734Network attack vector

Remote daemon hang via stalled sub-TLV decoding

Published May 4, 2026 · Updated May 4, 2026

Denial of service in OSRG GoBGP 4.0 through 4.3.0 allows remote attackers to hang the BGP daemon via a crafted SRv6 sub-TLV. The SRv6 decoders advance the original data slice instead of the remaining sub-TLV slice when skipping an unknown type, so the loop never progresses. Reachability requires the daemon to decode an SRv6 L3 Service attribute containing an unknown sub-TLV; the resulting loop leaves the daemon unresponsive.

CVSS severity7.5
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OSRG GoBGP 4.0 through 4.3.0 allows remote attackers to hang the BGP daemon via a crafted SRv6 sub-TLV. The SRv6 decoders advance the original data slice instead of the remaining sub-TLV slice when skipping an unknown type, so the loop never progresses. Reachability requires the daemon to decode an SRv6 L3 Service attribute containing an unknown sub-TLV; the resulting loop leaves the daemon unresponsive.

The record

CVE
CVE-2026-7734
Published
May 4, 2026
Updated
May 4, 2026
Vendor
GoBGP
Product
GoBGP
Classifications
CWE-404, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0
  2. Affected versionversion=4.1
  3. Affected versionversion=4.2
  4. Affected versionversion=4.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GoBGP · GoBGPversion=4.0; version=4.1; version=4.2; version=4.3.0

Published CVSS scores

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-404Improper Resource Shutdown or Release
T1499.004Application 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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