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CVE-2026-44317

free5GC: PCF npcf-policyauthorization POST /app-sessions panics on suppFeat=1 with missing AfRoutReq via nil pointer dereference

Published: May 27, 2026Updated: May 28, 2026 Sources: CVE List NVDCWE-476
6.5MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 72.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's PCF POST /npcf-policyauthorization/v1/app-sessions handler panics on a single authenticated request whose ascReqData.suppFeat == "1" (enabling traffic-routing feature negotiation) and whose medComponents entries supply an afAppId but NO AfRoutReq. The create path then calls provisioningOfTrafficRoutingInfo(smPolicy, appID, routeReq, ...) with routeReq == nil and dereferences routeReq.RouteToLocs (and other fields) without a nil check, causing runtime error: invalid memory address or nil pointer dereference. Gin recovery converts the panic into HTTP 500. This vulnerability is fixed in 4.2.2.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476CWE-754

Affected Products

free5gc
oss-projectaka free5gc udm, udm, smf, free5gc smf
free5gcOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
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References

https://github.com/free5gc/free5gc/issues/879
github.com
https://github.com/free5gc/free5gc/security/advisories/GHSA-wwqh-7jm5-gj7w
github.com
https://github.com/free5gc/pcf/commit/508d70b8527a6c8c923179dad450ea01e16b6aeb
github.com
and 1 more references View all →

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