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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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:fda2e2aa4a904053c6044eee0fb19154fc07ce628eeb2d968018c7aebb4cb182
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"algernon","vendor":"xyproto","versions":[{"status":"affected","version":"< 1.17.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:350ba2345a476bac3c047edc242a11f4bfb18365cba9475dac5ae27e90dcc321 · sha256:41a5cfb80eb76c6d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:350ba2345a476bac3c047edc242a11f4bfb18365cba9475dac5ae27e90dcc321 · sha256:41a5cfb80eb76c6d… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:350ba2345a476bac3c047edc242a11f4bfb18365cba9475dac5ae27e90dcc321 · sha256:41a5cfb80eb76c6d… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/xyproto/algernon/issues/172","tags":["x_refsource_MISC"],"url":"https://github.com/xyproto/algernon/issues/172"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:350ba2345a476bac3c047edc242a11f4bfb18365cba9475dac5ae27e90dcc321 · sha256:41a5cfb80eb76c6d… · /containers/cna/references/1
{"name":"https://github.com/xyproto/algernon/security/advisories/GHSA-rr2f-4wrm-h6rg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/xyproto/algernon/security/advisories/GHSA-rr2f-4wrm-h6rg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:350ba2345a476bac3c047edc242a11f4bfb18365cba9475dac5ae27e90dcc321 · sha256:41a5cfb80eb76c6d… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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