CVE-2026-7583Public exploitNetwork attack vector

Authenticated BSF crash via non-/128 IPv6 prefix

Published May 1, 2026 · Updated May 1, 2026

Denial of service in the BSF component of Open5GS 2.7.0 through 2.7.7 allows remote authenticated users to crash the BSF process. The bsf_sess_find_by_ipv6prefix function asserts that ipv6Prefix is /128 instead of rejecting a syntactically valid shorter prefix. A low-privileged caller who can reach the HTTP/2 nbsf-management pcfBindings endpoint can reset the connection and terminate the service with exit code 139.

CVSS severity4.3
Medium
EPSS probability0.27%
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 the BSF component of Open5GS 2.7.0 through 2.7.7 allows remote authenticated users to crash the BSF process. The bsf_sess_find_by_ipv6prefix function asserts that ipv6Prefix is /128 instead of rejecting a syntactically valid shorter prefix. A low-privileged caller who can reach the HTTP/2 nbsf-management pcfBindings endpoint can reset the connection and terminate the service with exit code 139.

The record

CVE
CVE-2026-7583
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=2.7.0
  2. Affected versionversion=2.7.1
  3. Affected versionversion=2.7.2
  4. Affected versionversion=2.7.3
  5. Affected versionversion=2.7.4
  6. Affected versionversion=2.7.5
  7. Affected versionversion=2.7.6
  8. Affected versionversion=2.7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open5GS · Open5GSversion=2.7.0; version=2.7.1; version=2.7.2; version=2.7.3; version=2.7.4; version=2.7.5; version=2.7.6; version=2.7.7

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:N/A:P
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
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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