{"id":"CVE-2026-46385","aliases":["GHSA-w8j3-pq8g-8m7w","GO-2026-5046"],"url":"https://o3.security/vulnerability/CVE-2026-46385","summary":"iskorotkov/avro: CPU Exhaustion in Avro Decoder","details":"iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets — so a producer can declare a block of up to math.MaxInt64 (~9.2 × 10¹⁸) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is \"indefinite until the worker is killed externally\" — a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. This vulnerability is fixed in 2.33.0.","published":"2026-05-29T19:58:59.667Z","modified":"2026-08-15T04:07:16.567897481Z","cvss":null,"epss":{"score":0.00504,"percentile":0.40641,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/iskorotkov/avro/v2","fixedVersion":"2.33.0"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46385.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:30651"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41030"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41064"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42852"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:44622"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:47149"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:48151"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53530"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-46385"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46385.json"},{"type":"ADVISORY","url":"https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46385"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2483475"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-15T04:07:16.567897481Z"}}