http4k: Unbounded gzip decompression in `ServerFilters.GZip` / `RequestFilters.GunZip` allowed memory-exhaustion DoS

Date Aug 17, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product Maven · org.http4k:http4k-core

CVE CVE-2026-53659

High-risk advisory CVE-2026-53659

Summary

http4k: Unbounded gzip decompression in `ServerFilters.GZip` / `RequestFilters.GunZip` allowed memory-exhaustion DoS

Why it matters

GitHub has published a reviewed security advisory for org.http4k:http4k-core. Prioritize it with other application dependency updates.

Operator check

Check whether org.http4k:http4k-core is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-g4w2-6h2r-3m3w NVD — CVE-2026-53659 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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