Critical flaw in Protobuf library enables JavaScript code execution
Brajeshwar
25 points
11 comments
April 19, 2026
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Discussion Highlights (4 comments)
rvz
Both "Javascript" and "Typescript" are incredibly flawed languages and the entire npm ecosystem is the bane of the software security industry.
skybrian
How does the attacker supply a malicious schema? Can that be turned off? It doesn't seem like a normal thing to do.
gnabgib
Lots more details from Endor labs (flaw finder & source): https://www.endorlabs.com/learn/the-dangers-of-reusing-proto...
lioeters
> the library builds JavaScript functions from protobuf schemas by concatenating strings and executing them via the Function() constructor, but it fails to validate schema-derived identifiers, such as message names. Typical "eval is evil" issue.