{"id":"CVE-2022-26652","aliases":["GHSA-6h3m-36w8-hv68","BIT-nats-2022-26652","GO-2022-0351"],"title":"Arbitrary file write in nats-server","summary":"Arbitrary file write in nats-server","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","vendor":"nats-io","product":"github.com/nats-io/nats-server/v2","ecosystem":"go","affected":["github.com/nats-io/nats-server/v2 >= 2.2.0, < 2.7.4","github.com/nats-io/nats-streaming-server >= 0.15.0, < 0.24.3"],"patched":["github.com/nats-io/nats-server/v2 2.7.4","github.com/nats-io/nats-streaming-server 0.24.3"],"published":"2022-03-10","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-6h3m-36w8-hv68","references":[{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-6h3m-36w8-hv68"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-26652"},{"url":"https://github.com/nats-io/nats-server/pull/2917"},{"url":"https://advisories.nats.io/CVE/CVE-2022-26652.txt"},{"url":"https://github.com/nats-io/nats-server"},{"url":"https://github.com/nats-io/nats-server/releases"},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.7.4"},{"url":"https://github.com/nats-io/nats-streaming-server/releases/tag/v0.24.3"},{"url":"http://www.openwall.com/lists/oss-security/2022/03/10/1"}],"tags":["osv","go"],"epss":0.02342,"epssPercentile":0.82714,"ingestedAt":"2026-07-09T18:56:35.995Z","slug":"CVE-2022-26652","body":"## Overview\n\n(This document is canonically: <https://advisories.nats.io/CVE/CVE-2022-26652.txt>)\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 <https://hub.docker.com/_/nats>\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\n\n## Affected packages\n\n- `github.com/nats-io/nats-server/v2 >= 2.2.0, < 2.7.4`\n- `github.com/nats-io/nats-streaming-server >= 0.15.0, < 0.24.3`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/nats-io/nats-server/v2 2.7.4`\n- `github.com/nats-io/nats-streaming-server 0.24.3`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.5,"exploitation":0,"ransomware":0},"changes":[]}