VulnerabilityGLOBAL

CVE-2026-44267: Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, plain Elo strings supplied to defaultF…

Elo is a purely functional expression language for no-code tools. Prior to 1.0.1, plain Elo strings supplied to defaultFormats.elo.parse(), bin/elo, or elo-lang.org/try can use .constructor.constructor to reach JavaScript Function because the member_access handler in src/transform.ts does not reject meta-properties, src/compilers/javascript.ts emits the surviving property directly, and src/parser.ts accepts constructor as an ordinary identifier. The resulting generated JavaScript executes attacker-selected code in the host runtime. This permits browser script execution and session compromise on the auto-running playground and arbitrary Node.js code execution on library, CI, or DevOps hosts. This plain-string path is distinct from the programmatic AST-object injection issue. This issue is fixed in version 1.0.1.

Published by source
2026-11-03
First seen by Reality Radar
2026-11-03
Last verified
2026-11-03

What the official notice says

Risk: critical severity (CVSS 9.8)

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Evidence ledger

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EntryKindObservedEvidence hashEntry hash
#3670new2026-11-03bf6f15a39b5f…de7473ee90a1d0ffc2…1b7cad

Chain head: #3807 03071ef7d321…845940

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