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Brotli Decoder Memory Corruption RCE Affects Bun, Python, Envoy
- Engineer — Act: A public PoC exists for this buffer-overflow RCE in the Brotli decoder, and the affected surface is wide: update Python brotli and brotlicffi packages to patched versions and audit any Envoy proxy configuration that enables Brotli decompression, since attacker-controlled compressed payloads are the trigger.
- SOC/IR — Learn: No active exploitation campaign, no published IOCs, and EPSS sits at effectively zero — there is no hunt or detection to run today, but analysts should understand that Brotli-decompressing endpoints (Envoy, Python services) represent an emerging RCE surface to watch if exploitation picks up.
- Leader — Skip
- Signals: CVE-2026-111497 — CISA KEV: not listed, EPSS 0.00, public PoC on GitHub
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