{"answers":{"affected":"7 open source packages ship an affected version, including github.com/nats-io/nats-server/v2, nats and github.com/nats-io/nats-server. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33249 in the wild and no public exploit code.","fix":"Upgrade github.com/nats-io/nats-server/v2 to a fixed version for your release line: 2.11.15 or 2.12.6.","what":"CVE-2026-33249 is a medium-severity missing authorization vulnerability in nats-io nats-server, published on 25 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33249 and fix it if it is affected.\n\nWhat it is: CVE-2026-33249 is a medium-severity missing authorization vulnerability in nats-io nats-server, published on 25 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-33249 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/nats-io/nats-server/v2 (Go): affected from 2.11.0; fixed in 2.11.15, 2.12.6\n- github.com/nats-io/nats-server/v2 (Go): affected from 2.11.0; fixed in 2.11.15\n- github.com/nats-io/nats-server/v2 (Go): affected from 2.11.0; fixed in 2.11.15\n- github.com/nats-io/nats-server/v2 (Go): affected from 2.12.0-preview.1; fixed in 2.12.6\n- github.com/nats-io/nats-server/v2 (Go): affected from 2.12.0-preview.1; fixed in 2.12.6\n- nats (Bitnami): affected from 2.11.0; fixed in 2.11.15, 2.12.6\n- github.com/nats-io/nats-server (Go): affected all versions; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33249/ (Markdown: https://insights.sbomify.com/CVE-2026-33249/index.md)","id":"CVE-2026-33249","markdown":"https://insights.sbomify.com/CVE-2026-33249/index.md","name":"CVE-2026-33249","record":{"aliases":["BIT-nats-2026-33249","CLEANSTART-2026-QF31649","DEBIAN-CVE-2026-33249","GHSA-8m2x-3m6q-6w8j","GO-2026-4826","MINI-6jvx-c2r8-227h","MINI-79vq-c3p7-p74w","MINI-gxjv-9g6x-68j5","MINI-j2fc-r5mg-mcrh","MINI-j3gc-r4wm-mjpm","MINI-jh7h-wpxh-q45q","MINI-vgrw-44j7-6h8m","ROOT-APP-GOBINARY-CVE-2026-33249","UBUNTU-CVE-2026-33249"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"NATS messaging server","requires_auth":"low_privilege","summary":"A valid NATS client can redirect message traces to unauthorized subjects, bypassing publish permissions and potentially exposing trace data.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"nats-server","vendor":"linuxfoundation"}],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"NATS: Message tracing can be redirected to arbitrary subject","id":"CVE-2026-33249","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":7,"n_references":2,"next":{"headline":"Crash when receiving specially-crafted packets","id":"CVE-2026-33250"},"packages":[{"ecosystem":"Bitnami","fixed":["2.11.15","2.12.6"],"introduced":["2.11.0","2.12.0"],"last_affected":[],"package":"nats","purl":"pkg:bitnami/nats","source":"BIT-nats-2026-33249"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/nats-io/nats-server","purl":"pkg:golang/github.com/nats-io/nats-server","source":"GO-2026-4826"},{"ecosystem":"Go","fixed":["2.11.15","2.12.6"],"introduced":["2.11.0","2.12.0-preview.1"],"last_affected":[],"package":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","source":"GO-2026-4826"},{"ecosystem":"Go","fixed":["2.11.15"],"introduced":["2.11.0"],"last_affected":[],"package":"github.com/nats-io/nats-server/v2","purl":null,"source":"GHSA-8m2x-3m6q-6w8j"},{"ecosystem":"Go","fixed":["2.11.15"],"introduced":["2.11.0"],"last_affected":[],"package":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","source":"GHSA-8m2x-3m6q-6w8j"},{"ecosystem":"Go","fixed":["2.12.6"],"introduced":["2.12.0-preview.1"],"last_affected":[],"package":"github.com/nats-io/nats-server/v2","purl":null,"source":"GHSA-8m2x-3m6q-6w8j"},{"ecosystem":"Go","fixed":["2.12.6"],"introduced":["2.12.0-preview.1"],"last_affected":[],"package":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","source":"GHSA-8m2x-3m6q-6w8j"}],"prev":{"headline":"NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching","id":"CVE-2026-33248"},"products":["nats-server"],"published":"2026-03-25","related":[{"cvss_score":9.8,"headline":"NATS nats-server allows directory traversal via unintended path to a management action","id":"CVE-2022-28357","kev_date_added":null,"published":"2023-09-19"},{"cvss_score":8.8,"headline":"NATS Server: Route API Auth Bypass","id":"CVE-2026-58253","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":8.8,"headline":"Incorrect Authorization in NATS nats-server","id":"CVE-2022-24450","kev_date_added":null,"published":"2022-02-08"},{"cvss_score":8.6,"headline":"NATS has MQTT plaintext password disclosure","id":"CVE-2026-33216","kev_date_added":null,"published":"2026-03-25"},{"cvss_score":7.7,"headline":"NATS Server: Remote crash via integer overflow in Connz pagination","id":"CVE-2026-58207","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory","id":"CVE-2026-58210","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"NATS Server: Pre-auth server crash via double INFO in leafnode handshake","id":"CVE-2026-58250","kev_date_added":null,"published":"2026-07-08"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-26","vendors":["nats-io"]},"summary":"A valid NATS client can redirect message traces to unauthorized subjects, bypassing publish permissions and potentially exposing trace data.","url":"https://insights.sbomify.com/CVE-2026-33249/"}