CVE-2026-1739Public exploitNetwork attack vector

Unauthenticated service crash via unchecked UDR response

Published Feb 2, 2026 · Updated Feb 2, 2026

Null pointer dereference in free5GC PCF 1.4.0 through 1.4.1 allows remote attackers to crash the service via an HTTP request. HandleCreateSmPolicyRequest reads response.SmPolicyData before checking whether a failed downstream UDR request returned a nil response. No authentication or user interaction is required, but the request must cause the UDR lookup to return no response; the resulting panic terminates the PCF process.

CVSS severity7.5
High
EPSS probability0.72%
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 1.4.0 through 1.4.1 allows remote attackers to crash the service via an HTTP request. HandleCreateSmPolicyRequest reads response.SmPolicyData before checking whether a failed downstream UDR request returned a nil response. No authentication or user interaction is required, but the request must cause the UDR lookup to return no response; the resulting panic terminates the PCF process.

The record

CVE
CVE-2026-1739
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
free5GC
Product
PCF
Classifications
CWE-404, CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 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=1.4.0
  2. Affected versionversion=1.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · PCFversion=1.4.0; version=1.4.1

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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.

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-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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