BREAKING: OpenAI says it found a critical flaw in Brotli, a widely used compression library built into software like Node.js, Bun and Envoy. The bug could let an attacker take over a system just by sending it malicious compressed data, with no login needed. That works both ways: a hacker could hijack an unpatched server, or a malicious server could hijack an unpatched user’s device.

OpenAI reported discovering a critical vulnerability in Brotli, an open-source compression library embedded in widely deployed software including Node.js, Bun and Envoy, which could allow an attacker to take control of a system by transmitting malicious compressed content. The transmission mechanism runs through cybersecurity risk premia and enterprise software spending rather than through rates or inflation, as a flaw of this breadth raises the probability of emergency patching, incident response costs and potential exploitation before updates are deployed. Exposure is concentrated in cloud infrastructure and developer-tools equities, along with security vendors that may see demand upside, while companies running affected runtimes at scale face operational and reputational risk. Traders should watch for official vendor advisories and patch releases from the Node.js, Bun and Envoy maintainers, along with any CVE assignment and disclosed exploitation activity, as these will indicate the scope of required remediation.

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