As cited
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vulnerabilities
Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second
Researchers disclosed a Spectre-based side-channel attack against Cloudflare Workers that extracted a JSON Web Token (JWT) from a co-located worker in production at up to 12 bits per second, a 360-fold improvement over a 2021 proof of concept. The attack leveraged an attacker-controlled worker to exploit transient execution vulnerabilities and leak sensitive authentication credentials from neighboring workloads.
Why it matters: Cloudflare Workers customers face exposure to credential theft through side-channel attacks when running untrusted or third-party code in shared execution environments; teams should review worker isolation policies and consider whether sensitive operations require additional protection layers.
- Source published
- First seen by Cybersecurity Tracker
Source attribution
Correction
Correction recorded as of .
vulnerabilities
Cloudflare Workers Spectre Attack Leaks JWT From Co-Located Worker at 12 Bits/Second
Researchers disclosed a Spectre-based side-channel attack against Cloudflare Workers that extracted a JSON Web Token (JWT) from a co-located worker in production at up to 12 bits per second, a 360-fold improvement over a 2021 proof of concept. The attack leveraged an attacker-controlled worker to exploit transient execution vulnerabilities and leak sensitive authentication credentials from neighboring workloads.
Why it matters: Cloudflare Workers customers face exposure to credential theft through side-channel attacks when running untrusted or third-party code in shared execution environments; teams should review worker isolation policies and consider whether sensitive operations require additional protection layers.
- Source published
- First seen by Cybersecurity Tracker