CVE-2025-70034
Mscdex Ssh2 1.17.0
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSummary
CVE-2025-70034 is a high-severity Inefficient Regular Expression Complexity (CWE-1333) vulnerability in Mscdex Ssh2. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked at the 27th 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 SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2025-70034 is a vulnerability classified under CWE-1333 (Inefficient Regular Expression Complexity, also known as ReDoS) affecting version 1.17.0 of the mscdex ssh2 library. Published on 2026-03-09, it carries a CVSS v3.1 base score of 7.5 (High), reflecting its potential for significant impact despite no effects on confidentiality or integrity.
The vulnerability enables remote, unauthenticated attackers to exploit it over the network with low attack complexity and no user interaction required. Successful exploitation results in high-impact denial of service, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), potentially causing resource exhaustion through malicious inputs that trigger excessive computation in regular expression processing.
References include a GitHub Gist at https://gist.github.com/zcxlighthouse/78a0d9b7fcae20294076e8b24f763ce5 detailing the issue, along with the mscdex organization page (https://github.com/mscdex) and the ssh2 repository (https://github.com/mscdex/ssh2), which security practitioners should review for any advisories, patches, or mitigation guidance specific to affected deployments.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-208436
Vulnerability Data
An issue pertaining to CWE-1333: Inefficient Regular Expression Complexity (4.19) was discovered in mscdex ssh2 v1.17.0.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Developer testing and evaluation can discover inefficient regex patterns via performance or static analysis.
Development standards and tools can require safe regex construction and forbid known exponential patterns.
Denial-of-service protections limit resource exhaustion caused by expensive regex evaluation.
Input validation can constrain data that would otherwise trigger worst-case regex complexity.
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.
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.
Security testing can detect and reject regex patterns with exponential worst-case complexity.
Secure development lifecycle mandates review of algorithmic efficiency, directly addressing ReDoS-prone regex.
Application security requirements can specify input-validation rules that limit regex complexity.
Secure architecture principles encourage avoidance of computationally expensive constructs such as catastrophic backtracking.
Secure coding standards explicitly prohibit or limit the use of inefficient regular expressions.