CVE-2026-10157Public exploitNetwork attack vector

UE handover denial via unverified security capabilities

Published May 31, 2026 · Updated May 31, 2026

Improper authentication in Open5GS 2.7.0 through 2.7.6 allows remote attackers to disrupt UE handovers via NGAP PathSwitchRequest messages. The AMF's ngap_handle_path_switch_request() handler overwrites locally stored UE security capabilities with unverified values supplied by a gNB. A malicious gNB can zero the supported integrity algorithms, causing later handovers to legitimate gNBs to fail persistently for affected UEs.

CVSS severity7.3
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Open5GS 2.7.0 through 2.7.6 allows remote attackers to disrupt UE handovers via NGAP PathSwitchRequest messages. The AMF's ngap_handle_path_switch_request() handler overwrites locally stored UE security capabilities with unverified values supplied by a gNB. A malicious gNB can zero the supported integrity algorithms, causing later handovers to legitimate gNBs to fail persistently for affected UEs.

The record

CVE
CVE-2026-10157
Published
May 31, 2026
Updated
May 31, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-287, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 31, 2026CVE publishedPublication date reported by the CVE source.
  2. May 31, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

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

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

Weakness, pattern, technique

CWE-287Improper Authentication
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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