{"id":"GHSA-6h3m-36w8-hv68","summary":"Arbitrary file write in nats-server","details":"(This document is canonically: \u003chttps://advisories.nats.io/CVE/CVE-2022-26652.txt\u003e)\n\n## Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nJetStream is the optional RAFT-based resilient persistent feature of NATS.\n\n\n## Problem Description\n\nThe JetStream streams can be backed up and restored via NATS. The backup format is a tar archive file.  Inadequate checks on the filenames within the archive file permit a so-called \"Zip Slip\" attack in the stream restore.\n\nNATS nats-server through 2022-03-09 (fixed in release 2.7.4) did not correctly sanitize elements of the archive file, thus a user of NATS\ncould cause the NATS server to write arbitrary content to an attacker-controlled filename.\n\n\n## Affected versions\n\nNATS Server:\n * 2.2.0 up to and including 2.7.3.\n   + Introduced with JetStream Restore functionality\n * Fixed with nats-io/nats-server: 2.7.4\n * Docker image:  nats \u003chttps://hub.docker.com/_/nats\u003e\n * NB users of OS package files from our releases: a change in goreleaser defaults, discovered late in the release process, moved the install directory from /usr/local/bin to /usr/bin; we are evaluating the correct solution for subsequent releases, but not recutting this release.\n\nNATS Streaming Server\n * 0.15.0 up to and including 0.24.2\n * Fixed with nats-io/nats-streaming-server: 0.24.3\n * Embeds a nats-server, but this server is the old approach which JetStream replaces, so unlikely (but not impossible) to be\n   configured with JS support\n\n\n## Workarounds\n\n * Disable JetStream for untrusted users.\n * If only one NATS account uses JetStream, such that cross-user attacks are not an issue, and any user in that account with access to the JetStream API is fully trusted anyway, then appropriate sandboxing techniques will prevent exploit.\n   + Eg, with systemd, the supplied util/nats-server-hardened.service example configuration demonstrates that NATS runs fine as an unprivileged user under ProtectSystem=strict and PrivateTmp=true restrictions; by only opening a ReadWritePaths hole for the JetStream storage area, the impact of this vulnerability is limited.\n\n\n## Solution\n\nUpgrade the NATS server to at least 2.7.4.\n\nWe fully support the util/nats-server-hardened.service configuration for running a NATS server and encourage this approach.\n\n\n## Credits\n\nThis issue was reported (on 2022-03-07) to the NATS Maintainers by\nYiming Xiang, TIANJI LAB of NSFOCUS.  \nThank you / 谢谢你！\n","aliases":["BIT-nats-2022-26652","CVE-2022-26652","GO-2022-0351"],"modified":"2026-07-08T06:29:51.186865744Z","published":"2022-03-10T22:07:30Z","database_specific":{"cwe_ids":["CWE-22"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2022-03-10T22:07:30Z","nvd_published_at":"2022-03-10T17:47:00Z"},"references":[{"type":"WEB","url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-6h3m-36w8-hv68"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-26652"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/pull/2917"},{"type":"WEB","url":"https://advisories.nats.io/CVE/CVE-2022-26652.txt"},{"type":"PACKAGE","url":"https://github.com/nats-io/nats-server"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases"},{"type":"WEB","url":"https://github.com/nats-io/nats-server/releases/tag/v2.7.4"},{"type":"WEB","url":"https://github.com/nats-io/nats-streaming-server/releases/tag/v0.24.3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2022/03/10/1"}],"affected":[{"package":{"name":"github.com/nats-io/nats-server/v2","ecosystem":"Go","purl":"pkg:golang/github.com/nats-io/nats-server/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.2.0"},{"fixed":"2.7.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-6h3m-36w8-hv68/GHSA-6h3m-36w8-hv68.json"}},{"package":{"name":"github.com/nats-io/nats-streaming-server","ecosystem":"Go","purl":"pkg:golang/github.com/nats-io/nats-streaming-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.15.0"},{"fixed":"0.24.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-6h3m-36w8-hv68/GHSA-6h3m-36w8-hv68.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:H/A:N"}]}