Cyber Resilience

CVE-2026-7707

Published
03 May 2026
Modified
05 May 2026
CVSS Score v4 2.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
EPSS Score 0.0041 33th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2026-7707 is a low-severity Improper Resource Shutdown or Release (CWE-404) vulnerability. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 33th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-5 (Denial-of-service Protection) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A vulnerability was found in Open5GS up to 2.7.7. Impacted is the function udr_nudr_dr_handle_subscription_context of the file /src/udr/nudr-handler.c of the component UDR. The manipulation of the argument pei results in denial of service. The attack can be launched remotely. The…

more

exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

CWE(s)
CWE-404

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Remote DoS via argument manipulation in network service directly matches application exploitation for endpoint denial of service.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1499.004 Application or System Exploitation Impactconfidence: HIGH
Vulnerability allows remote manipulation of pei argument to trigger denial of service via application exploitation.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

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CVE-2025-1377Shared CWE-404
CVE-2025-1376Shared CWE-404
CVE-2026-40136Shared CWE-404
CVE-2026-8222Shared CWE-404
CVE-2026-4240Shared CWE-404

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-10 Information Input Validation
  • SC-5 Denial-of-service Protection
Detect
Catch it (NIST detect / respond)
  • SI-2 Flaw Remediation
Harden
Shrink the surface (DISA STIG)

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Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Validates the 'pei' argument in udr_nudr_dr_handle_subscription_context before processing, directly blocking the malformed input that triggers the CWE-404 resource-release flaw and resulting DoS.

SC-5 Denial-of-service Protection good match
prevent

Implements denial-of-service protection mechanisms that limit the impact of resource-exhaustion attacks exploiting the UDR handler, mitigating the remote availability impact described in the CVE.

SI-2 Flaw Remediation partial match
respond

Requires timely remediation of the publicly disclosed flaw in Open5GS UDR component, addressing the root cause once a patch for the improper resource handling becomes available.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly include coding standards for correct resource allocation and release.

DE.CM-09 partial match
prevents

Runtime monitoring can detect resource exhaustion caused by improper shutdown or release.

ID.AM-08 partial match
prevents

Lifecycle management of assets can encompass proper resource release at end-of-life or shutdown.

PR.IR-04 partial match
prevents

Capacity management helps surface leaks from unreleased resources but does not prevent the coding flaw.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.37 Documented operating procedures partial match
prevents

Including restart, recovery and media-handling instructions reduces the likelihood that resources or sensitive data will be left in an exposed or improperly released state after a failure.

References