Vulnerability Analysis
Algernon: Race Condition in handle() shared LState
CVE-2026-43981
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.
No Active Exploit Signals
CVSS Base Score
8.2
HIGH
Exploitability:-
Impact Score:-
Temporal Score:-
EPSS:0.18%
Threat Intelligence Signals
CISA KEV
No
KEV Date Added
—
Ransomware Use
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KEV Due Date
—
VulnCheck In-the-Wild
No
Nuclei Template
No
EPSS Score
0.182%
EPSS Percentile
7.9th pct
GHSA ID
—
GitHub Severity
—
SSVC Exploitation
—
SSVC Automatable
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Vulnerability Class
—
Identity & Timeline
| Status | - |
| Assigning Authority | - |
| CVSS Version / Source | - |
| Reserved | - |
| Published | - |
| Patch Date (date_public) | - |
| Exploit DB Date | - |
| First GitHub PoC Date | - |
| Last Updated | - |
| Time to Patch (Days to fix) | - |
| Exploit Release Gap | - |
| PoC Release Gap | - |
| Exploit DB References | None identified |
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| No affected products specified. | ||
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