CVE-2026-75439Public exploitNetwork attack vector

UPF crash via unchecked deleted session lookup

Published Sep 4, 2026 · Updated Sep 4, 2026

Denial of service in Free5GC 4.2.2 allows remote attackers to crash the UPF via a stale PFCP Session Report Response. LocalNode.RemoteSess iterates over session slots and reads RemoteID without checking whether a slot was cleared to nil after session deletion. Exploitation requires a response tied to a locally deleted session; the resulting panic interrupts user-plane service.

CVSS severityUnavailable
Unscored
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

Denial of service in Free5GC 4.2.2 allows remote attackers to crash the UPF via a stale PFCP Session Report Response. LocalNode.RemoteSess iterates over session slots and reads RemoteID without checking whether a slot was cleared to nil after session deletion. Exploitation requires a response tied to a locally deleted session; the resulting panic interrupts user-plane service.

The record

CVE
CVE-2026-75439
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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