Cyber Resilience

CVE-2026-49941

DoS in Rrwo Net\ \

DoS
Published
04 June 2026
Modified
22 July 2026
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0033 26th percentile
Risk Priority 58 floored blend · peak EPSS

Summary

CVE-2026-49941 is a high-severity Uncontrolled Recursion (CWE-674) vulnerability in Rrwo Net\. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 26th 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 SI-10 (Information Input Validation) and SC-5 (Denial-of-service Protection) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Net::CIDR::Set versions through 0.20 for Perl did not validate IP addresses. The add method called the _encode method to parse addresses. If the addresses did not look like netmasks or network ranges, then they were assumed to single IP addresses…

more

and passed back to itself as a 32-bit or 128-bit netmask. If the argument was not a well-formed IP address, then this would lead to indefinite recursion. An attacker could use this to cause a denial of service.

CWE(s)
CWE-674CWE-1287

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-49942Same product: Rrwo Net\
CVE-2026-49940Same product: Rrwo Net\
CVE-2026-7040Same vendor: Rrwo
CVE-2025-30027Shared CWE-1287
CVE-2025-9524Shared CWE-1287
CVE-2024-9404Shared CWE-1287
CVE-2024-47504Shared CWE-1287
CVE-2026-25179Shared CWE-1287
CVE-2025-9042Shared CWE-1287
CVE-2026-26115Shared CWE-1287

Affected Assets

rrwo
net\
\

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.1.1
  • V1.4.2
  • V2.1.1
  • V2.2.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation can reject or constrain data that would otherwise drive unbounded recursive calls.

SC-5 Denial-of-service Protection partial match

DoS protection mechanisms limit the resource-exhaustion impact of uncontrolled recursion without eliminating the flaw.

SI-4 System Monitoring partial match

System monitoring can observe anomalous resource consumption that signals runaway recursion after it begins.

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 prevent coding errors such as missing recursion limits or termination conditions.

DE.CM-09 partial match
prevents

Runtime monitoring of compute resources can detect excessive consumption caused by uncontrolled recursion.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover and record uncontrolled recursion flaws before deployment.

PR.IR-04 partial match
prevents

Capacity monitoring and resource provisioning can absorb or limit the impact of runaway recursion.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect excessive recursion via static analysis or fuzzing.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle requires controls that prevent uncontrolled recursion through design and code review.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate recursion limits or stack-depth checks.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture principles include resource-management and input-validation rules that limit recursion.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prohibit or constrain recursive constructs that could exhaust stack or memory.

A.8.6 Capacity management partial match
finds

Capacity management includes monitoring and limits that mitigate resource exhaustion from runaway recursion.

References