{"id":"CVE-2026-59803","summary":"rpcx - Denial of Service via Gzip Decompression Bomb in Wire Protocol","details":"rpcx through 1.9.3, fixed in commit 047aec1, contains a denial-of-service vulnerability in protocol.Message.Decode (protocol/message.go). When a message has the compression flag set, the payload is gzip-decompressed via util.Unzip with no limit on the decompressed output size. The only built-in size guard, protocol.MaxMessageLength, is checked against the compressed on-the-wire frame length, not the decompressed size, so it provides no protection. Because decoding (and decompression) occurs in readRequest before authentication, a single unauthenticated connection can send a small (under 2 MB) gzip-compressed message that expands to gigabytes of heap allocation, leading to out-of-memory conditions and service unavailability.","modified":"2026-07-15T01:48:51.642207774Z","published":"2026-07-08T19:42:29.448Z","database_specific":{"cwe_ids":["CWE-409"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59803.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59803.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59803"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/rpcx-denial-of-service-via-gzip-decompression-bomb-in-wire-protocol"},{"type":"REPORT","url":"https://github.com/smallnest/rpcx/pull/943"},{"type":"FIX","url":"https://github.com/smallnest/rpcx/commit/047aec18efa7d037105e2b72c36dd2ae05e1acc6"},{"type":"PACKAGE","url":"https://github.com/smallnest/rpcx"},{"type":"EVIDENCE","url":"https://github.com/smallnest/rpcx/issues/942"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/smallnest/rpcx","events":[{"introduced":"0"},{"fixed":"d924ffd970626e76a7e48c2b77cd8599f675fd41"},{"fixed":"047aec18efa7d037105e2b72c36dd2ae05e1acc6"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"1.9.3"}]}}],"versions":["v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.37","v1.7.15","v1.8.36","v1.8.35","v1.8.34","v1.8.33","v1.8.32","v1.8.31","v1.8.30","v1.8.29","v1.8.28","v1.8.27","v1.8.26","v1.8.25","v1.8.24","v1.8.23","v1.8.22","v1.8.21","v1.8.20","v1.8.18","v1.8.17","v1.8.16","v1.8.15","v1.8.14","v1.8.13","v1.8.12","v1.8.11","v1.8.10","v1.8.9","v1.8.8","v1.8.7","v1.8.6","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.14","v1.7.13","v1.7.12","v1.7.11","v1.7.10","v1.7.9","v1.7.8","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.12","v1.6.11","v1.6.10","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.4.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59803.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}