libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays
High-risk advisory
CVE-2026-49866
Summary
libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays
Why it matters
GitHub has published a reviewed security advisory for @libp2p/gossipsub. Prioritize it with other application dependency updates, especially because EPSS places it in the 36% percentile.
Operator check
Check whether @libp2p/gossipsub is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 36%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.