VULNERABILITY INTELLIGENCE
CVE-2026-43981
EPSS probability0.18%
CISA KEVNot currently listed
Published2026-05-26
Last modified2026-07-24
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.
Weakness classification
- security-advisories@github.com: CWE-362