CVE-2026-44316Public exploitNetwork attack vector

Request interruption via unchecked nil UDR response

Published May 27, 2026 · Updated May 27, 2026

NULL pointer dereference in free5GC PCF before 4.2.2 allows remote attackers to interrupt SM-policy requests via a crafted POST. HandleCreateSmPolicyRequest logs a failed UDR OpenAPI lookup and continues, then dereferences the nil response structure. The SM-policy-control route accepts the trigger without authorization; Gin returns HTTP 500 for each request while the PCF process and other endpoints remain available.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in free5GC PCF before 4.2.2 allows remote attackers to interrupt SM-policy requests via a crafted POST. HandleCreateSmPolicyRequest logs a failed UDR OpenAPI lookup and continues, then dereferences the nil response structure. The SM-policy-control route accepts the trigger without authorization; Gin returns HTTP 500 for each request while the PCF process and other endpoints remain available.

The record

CVE
CVE-2026-44316
Published
May 27, 2026
Updated
May 27, 2026
Vendor
free5GC
Product
free5GC
Classifications
CWE-754, CWE-476
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=< 4.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · free5GCversion=< 4.2.2

Published CVSS scores

7.5GitHubCVSS: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-476NULL Pointer Dereference

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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