Vulnerability Description
Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, in engine/luahandler.go, the sync.RWMutex protecting LoadCommonFunctions is released before L.Push() and L.PCall() execute. Since gopher-lua's LState is explicitly not goroutine-safe, concurrent requests race on the shared state causing Lua VM corruption. The Go race detector confirms this immediately under modest concurrency (ab -n 1000 -c 100). This vulnerability is fixed in 1.17.6.
Related Weaknesses (CWE)
References
- https://github.com/xyproto/algernon/issues/172
- https://github.com/xyproto/algernon/security/advisories/GHSA-rr2f-4wrm-h6rg
FAQ
What is CVE-2026-43981?
CVE-2026-43981 is a documented vulnerability. Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, in engine/luahandler.go, the sync.RWMutex protecting LoadCommonFunctions is released before L.Push() and L.PCall() execute. Sinc...
How severe is CVE-2026-43981?
CVSS scoring is not yet available for CVE-2026-43981. Check NVD for updates.
Is there a patch for CVE-2026-43981?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.