CVE-2026-82590Network attack vectorHinoki check available

Authenticated SMF crash via invalid preemptCap enum

Published Aug 30, 2026 · Updated Aug 30, 2026

Reachable assertion in Open5GS SMF 2.7.0 through 2.7.7 allows remote authenticated users to crash the SMF via a crafted UDM response. The smf_nudm_sdm_handle_get function maps an unknown preemptCap enum string to zero and asserts that the session's internal preemption capability was set. An attacker must control or impersonate a registered UDM reachable by the SMF; triggering the path aborts the entire SMF process rather than only the transaction.

CVSS severity4.3
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Reachable assertion in Open5GS SMF 2.7.0 through 2.7.7 allows remote authenticated users to crash the SMF via a crafted UDM response. The smf_nudm_sdm_handle_get function maps an unknown preemptCap enum string to zero and asserts that the session's internal preemption capability was set. An attacker must control or impersonate a registered UDM reachable by the SMF; triggering the path aborts the entire SMF process rather than only the transaction.

The record

CVE
CVE-2026-82590
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 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

4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:N/A:P
5.3VulDB CNACVSS: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:X
4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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