CVE-2026-46385
HIGH(7.5)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 7.5 — Hoch
EPSS-Score
0%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
7.5
Technische Schwere
Beschreibung
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.
GitHub Advisories
iskorotkov/avro: CPU Exhaustion in Decoder
Referenzen
- https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w
- https://access.redhat.com/errata/RHSA-2026:30651
- https://access.redhat.com/security/cve/CVE-2026-46385
- https://bugzilla.redhat.com/show_bug.cgi?id=2483475
- https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46385.json