CVE-2026-67183 GeneralSandman CVE debrief

Who should care

System administrators and security teams responsible for web server infrastructure should assess their exposure and consider implementing compensating controls. Developers and DevOps teams should verify if the vulnerable version of TinyWeb is in use and prioritize remediation or mitigation efforts.

Why it matters

CVE-2026-67183 is a memory leak vulnerability in TinyWeb 0.0.8 that allows unauthenticated attackers to cause memory exhaustion via well-formed HTTP requests. Defenders should prioritize verifying exposure and assessing potential impact, as the vulnerability can lead to denial-of-service (DoS) conditions. System administrators and security teams responsible for web server infrastructure should assess their exposure and consider implementing compensating controls.

• Denial-of-service (DoS) conditions due to memory exhaustion.
• Potential system crashes or worker process termination.
• Increased risk of service disruption or downtime.
• Need for verification of exposure and potential impact.

Technical summary

The vulnerability is caused by missing destructors and unreachable delete calls in the HttpParser::execute() function, leading to a monotonic increase in worker resident memory by approximately 20 to 28 kB per request. This can cause memory exhaustion and potentially lead to a denial-of-service (DoS) condition. The vulnerability affects TinyWeb version 0.0.8 and allows unauthenticated attackers to cause memory exhaustion via well-formed HTTP requests. Defenders should prioritize verifying exposure and assessing potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, as the vulnerability can lead to denial-of-service (DoS) conditions. System administrators and security teams responsible for web server infrastructure should assess their exposure and consider implementing compensating controls.

Recommended defensive actions

• Verify exposure by checking if the vulnerable version of TinyWeb is in use.
• Assess potential impact by evaluating the system's reliance on TinyWeb and potential consequences of a DoS condition.
• Consider implementing compensating controls, such as rate limiting or IP blocking, to mitigate the vulnerability.
• Monitor system resources and implement logging and alerting to detect potential exploitation attempts.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected product. Additional information is available from source references, including a GitHub repository and a Vulncheck advisory.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.