PT-2026-43297 · Algernon · Algernon

Katrielmoses · CVE-2026-43981 · Published 2026-05-26 · Updated 2026-05-26

Positive Technologies (AI Summary)

CVSS v4.0

8.2

High

Base vector

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Algernon versions prior to 1.17.6

Description In the engine/luahandler.go file, the sync.RWMutex protecting LoadCommonFunctions is released before the L.Push() and L.PCall() functions execute. Because the LState of gopher-lua is not goroutine-safe, concurrent requests create a race condition on the shared state, leading to Lua VM corruption.

Recommendations Update to version 1.17.6.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-43981

GHSA-RR2F-4WRM-H6RG

Affected Products

Algernon

References · 5

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43981.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-43981 · Security Note
• https://osv.dev/vulnerability/CVE-2026-43981 · Vendor Advisory
• https://github.com/xyproto/algernon/security/advisories/GHSA-rr2f-4wrm-h6rg · Note
• https://github.com/xyproto/algernon/issues/172 · Note