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Vulnerability record · CVE-2026-67184 · published 28 July 2026

CVE-2026-67184: NULL pointer dereference vulnerability

TinyWeb through 0.0.8 contains a null pointer dereference vulnerability that allows unauthenticated remote attackers to crash worker processes by sending a malformed HTTP request line with an invalid version string. The HttpParser::execute() function fails to allocate the Url object when version parsing fails, leaving the url pointer NULL, and buildResponse() subsequently dereferences this NULL pointer without checking the valid_requ flag, producing a SIGSEGV that terminates the worker process and, when repeated across all workers, takes the server permanently offline until manually restarted.

8.7 CVSS 4.0 High EPSS 0.61% · top 53.1% CWE-476 · NULL pointer dereference Deferred
8.7CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
30 Jul 2026Last modified by NVD

Description

TinyWeb through 0.0.8 contains a null pointer dereference vulnerability that allows unauthenticated remote attackers to crash worker processes by sending a malformed HTTP request line with an invalid version string. The HttpParser::execute() function fails to allocate the Url object when version parsing fails, leaving the url pointer NULL, and buildResponse() subsequently dereferences this NULL pointer without checking the valid_requ flag, producing a SIGSEGV that terminates the worker process and, when repeated across all workers, takes the server permanently offline until manually restarted.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:

References

LinkTags
https://github.com/theopaid/Unauthenticated-NULL-Pointer-Dereference-Crashes-the-Server-TinyWeb-
https://www.vulncheck.com/advisories/tinyweb-null-pointer-dereference-dos-via-malformed-http-request

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.2CVE-2026-21525Windows Remote Access Connection Manager null pointer dereference DoSWindows Remote Access Connection Manager contains a null pointer dereference (CWE-476) that lets an unauthorized attacker deny service locally. The f…KEVEPSS 4.8%analysed

Source: NIST National Vulnerability Database (record CVE-2026-67184), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.