What’s Vulnerable › Vulnerabilities

CVE-2023-45811: Prototype pollution vulnerability leading to arbitrary code execution in synchrony deobfuscator

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-10-17 · updated 2026-06-17
• Weakness: CWE-1321

Description

Synchrony deobfuscator is a javascript cleaner & deobfuscator. A `__proto__` pollution vulnerability exists in versions before v2.4.4. Successful exploitation could lead to arbitrary code execution. A `__proto__` pollution vulnerability exists in the `LiteralMap` transformer allowing crafted input to modify properties in the Object prototype. A fix has been released in `deobfuscator@2.4.4`. Users are advised to upgrade. Users unable to upgrade should launch node with the [--disable-proto=delete][disable-proto] or [--disable-proto=throw][disable-proto] flags

Affected products

• relative synchrony: from 2.0.1 before 2.4.4 — fixed in 2.4.4

How to fix

Upgrade to a fixed version: relative synchrony 2.4.4. Check the vendor advisory for mitigations.

References

• https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40
• https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx
• https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts
• https://github.com/relative/synchrony/commit/b583126be94c4db7c5a478f1c5204bfb4162cf40
• https://github.com/relative/synchrony/security/advisories/GHSA-jg82-xh3w-rhxx
• https://github.com/relative/synchrony/security/advisories/src/transformers/literalmap.ts

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