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Vulnerability Details :

CVE-2026-44328

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-27 May, 2026 | 15:39
Updated At-27 May, 2026 | 17:42
Rejected At-
Credits

free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:27 May, 2026 | 15:39
Updated At:27 May, 2026 | 17:42
Rejected At:
▼CVE Numbering Authority (CNA)
free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.

Affected Products
Vendor
free5gc
Product
free5gc
Versions
Affected
  • < 4.2.2
Problem Types
TypeCWE IDDescription
CWECWE-306CWE-306: Missing Authentication for Critical Function
CWECWE-476CWE-476: NULL Pointer Dereference
CWECWE-862CWE-862: Missing Authorization
Type: CWE
CWE ID: CWE-306
Description: CWE-306: Missing Authentication for Critical Function
Type: CWE
CWE ID: CWE-476
Description: CWE-476: NULL Pointer Dereference
Type: CWE
CWE ID: CWE-862
Description: CWE-862: Missing Authorization
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/905
x_refsource_MISC
https://github.com/free5gc/smf/pull/199
x_refsource_MISC
https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb
x_refsource_MISC
Hyperlink: https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/free5gc/free5gc/issues/905
Resource:
x_refsource_MISC
Hyperlink: https://github.com/free5gc/smf/pull/199
Resource:
x_refsource_MISC
Hyperlink: https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
exploit
https://github.com/free5gc/free5gc/issues/905
exploit
Hyperlink: https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
Resource:
exploit
Hyperlink: https://github.com/free5gc/free5gc/issues/905
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:27 May, 2026 | 17:16
Updated At:28 May, 2026 | 16:24

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Type: Secondary
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CPE Matches
free5gc
free5gc
>>free5gc>>Versions before 4.2.2(exclusive)
cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-306Secondarysecurity-advisories@github.com
CWE-476Secondarysecurity-advisories@github.com
CWE-862Secondarysecurity-advisories@github.com
CWE ID: CWE-306
Type: Secondary
Source: security-advisories@github.com
CWE ID: CWE-476
Type: Secondary
Source: security-advisories@github.com
CWE ID: CWE-862
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/free5gc/free5gc/issues/905security-advisories@github.com
Exploit
Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwrsecurity-advisories@github.com
Exploit
Vendor Advisory
https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120debsecurity-advisories@github.com
Patch
https://github.com/free5gc/smf/pull/199security-advisories@github.com
Issue Tracking
Patch
https://github.com/free5gc/free5gc/issues/905134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Vendor Advisory
Hyperlink: https://github.com/free5gc/free5gc/issues/905
Source: security-advisories@github.com
Resource:
Exploit
Issue Tracking
Hyperlink: https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Hyperlink: https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/free5gc/smf/pull/199
Source: security-advisories@github.com
Resource:
Issue Tracking
Patch
Hyperlink: https://github.com/free5gc/free5gc/issues/905
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Issue Tracking
Hyperlink: https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Vendor Advisory

Change History

0
Information is not available yet

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