{"id":"GHSA-cxpq-8v7q-cg56","summary":"Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit","details":"Vulnerability report without repro case. Repro case may be added later after harness is complete.\n\n**Preconditions (4):**\n- Tenant can create EnvoyExtensionPolicy (baseline)\n- Attacker hosts a gzip-bomb at a reachable URL\n- sha256 unset (optional field; check is post-decompression anyway)\n- No operator Wasm-URL allowlist (none exists in code)\n\n**Description**\n\ngetFileFromGZ calls io.ReadAll on a raw gzip.Reader (httpfetcher.go:216) with no output bound, while the compressed input is capped at 256 MiB (httpfetcher.go:139). The bytes originate from a tenant-controlled EnvoyExtensionPolicy.spec.wasm[].code.http.url (envoyextensionpolicy.go:1077 → cache.go:248 → httpfetcher.go:147 → :233), so an untrusted tenant can point at a ~10 MiB gzip-of-zeros and force ~10 GiB allocation in the shared controller process. All candidate guards execute either before the body is buffered or after decompression. OOM-kills, restarts, re-reconciles same CR, crash-loops — persistent cross-tenant control-plane outage with PR:L/AC:L and scope change → HIGH despite availability-only.","aliases":["BIT-envoy-gateway-2026-53716","CVE-2026-53716","GO-2026-6006"],"modified":"2026-09-21T09:40:55.070123583Z","published":"2026-07-16T19:18:08Z","database_specific":{"github_reviewed_at":"2026-07-16T19:18:08Z","nvd_published_at":null,"cwe_ids":["CWE-789"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56"},{"type":"PACKAGE","url":"https://github.com/envoyproxy/gateway"}],"affected":[{"package":{"name":"github.com/envoyproxy/gateway","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/gateway"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.8.0-rc.0"},{"fixed":"1.8.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-cxpq-8v7q-cg56/GHSA-cxpq-8v7q-cg56.json"}},{"package":{"name":"github.com/envoyproxy/gateway","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/gateway"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-cxpq-8v7q-cg56/GHSA-cxpq-8v7q-cg56.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}