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CVE-2026-8187· NVD / CVE Program· CNA VulDB

Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption

A flaw has been found in Open5GS up to 2.7.7. This impacts the function _gtpv1_u_recv_cb of the file src/upf/gtp-path.c of the component UPF. Executing a manipulation can lead to resource consumption. The attack may be performed from remote. The project was informed of the problem early through an issue report but has not responded yet.

MediumCVSS 6.9 · v4.0—No exploit No fix recorded
Published
May 9, 2026
Updated
Jul 24, 2026
EPSS
0.9% · 58th percentile
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Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
6.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS: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:X

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
open5gsopen5gs

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • open5gs open5gsup to 2.7.7 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a Open5GS

    • 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5, 2.7.6, 2.7.7affected

Same product

open5gs: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-28122A request-validation issue was discovered in Open5GS 2.1.3 through 2.2.x before 2.2.1.
    40Plan
  • CVE-2024-40130open5gs v2.6.4 is vulnerable to Buffer Overflow.
    39Monitor
  • CVE-2024-40129Open5GS v2.6.4 is vulnerable to Buffer Overflow.
    39Monitor
  • CVE-2021-25863Open5GS 2.1.3 listens on 0.0.0.0:3000 and has a default password of 1423 for the admin account.
    35Monitor
  • CVE-2026-15720Pre-auth heap out-of-bounds read in the AMF NAS 5GS mobile-identity handler
    34Monitor
  • CVE-2025-41068Reachable Assertion vulnerability in Open5GS
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-63288180 days apartIn Open5GS 2.7.6, AMF crashes when receiving an abnormal NGSetupRequest message, resulting in denial of service.
    30Monitor
  • CVE-2025-52322242 days apartAn issue in Open5GS v2.7.2 and before allows a remote attacker to cause a denial of service via a crafted Create Session Request message to
    30Monitor
  • CVE-2025-52288243 days apartAssertion failure in function ngap_build_downlink_nas_transport in file src/amf/ngap-build.c, the Access and Mobility Management Function (A
    30Monitor
  • CVE-2024-56921460 days apartAn issue was discovered in Open5gs v2.7.2.
    30Monitor
  • CVE-2024-57519466 days apartAn issue in Open5GS v.2.7.2 allows a remote attacker to cause a denial of service via the ogs_dbi_auth_info function in lib/dbi/subscription
    30Monitor
  • CVE-2023-37022472 days apartOpen5GS MME versions <= 2.6.4 contain a reachable assertion in the `UE Context Release Request` packet handler.
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS: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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
function expand(node) {  return node.children.map(expand);}

Fixed

ts
const MAX_DEPTH = 32;function expand(node, depth = 0) {  if (depth > MAX_DEPTH) throw new Error("too deep");  return node.children.map((c) => expand(c, depth + 1));}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records