CVE-2026-25679
Published: 06 March 2026
Summary
CVE-2026-25679 is a high-severity Forced Browsing (CWE-425) vulnerability in Golang Go. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 14.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-25679 affects the Go programming language's net/url package, specifically the url.Parse function, which insufficiently validates the host/authority component and accepts some invalid URLs. Published on 2026-03-06, it carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is associated with CWE-425.
Remote, unauthenticated attackers can exploit this vulnerability 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 availability metric.
Mitigation details are provided in official Go advisories and resources, including the vulnerability entry at https://pkg.go.dev/vuln/GO-2026-4601, the announcement at https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk, the issue tracker at https://go.dev/issue/77578, and the code review change at https://go.dev/cl/752180.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-10084
Vulnerability details
url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes a remotely exploitable flaw in Go's url.Parse that directly results in application or system crash/resource exhaustion (A:H impact, no C/I), mapping to T1499.004 Application or System Exploitation for DoS.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Flaw remediation directly mitigates CVE-2026-25679 by applying official Go patches to fix the insufficient URL host/authority validation causing DoS.
Denial-of-service protection implements mechanisms to block or limit the impact of remote exploitation via malformed URLs leading to high availability disruption.
Information input validation at the application level rejects or sanitizes invalid URLs before passing to Go's url.Parse, reducing exposure to the parsing flaw.