{"answers":{"affected":"3 open source packages ship an affected version, including istio.io/istio. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-39350 in the wild and no public exploit code.","fix":"Upgrade istio.io/istio to 0.0.0-20260403004500-692e460c342d or later.","what":"CVE-2026-39350 is a medium-severity authentication bypass vulnerability in istio, published on 15 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-39350 and fix it if it is affected.\n\nWhat it is: CVE-2026-39350 is a medium-severity authentication bypass vulnerability in istio, published on 15 Apr 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-2026-39350 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- istio.io/istio (Go): affected from 0.0.0-20241024090207-0bf27d49ba4b; fixed in 0.0.0-20260403004500-692e460c342d\n- istio.io/istio (Go): affected from 0.0.0-20241024090207-0bf27d49ba4b; fixed in 0.0.0-20260403004500-692e460c342d\n- istio.io/istio (Go): affected from 0.0.0-20241024090207-0bf27d49ba4b; fixed in 0.0.0-20260403004500-692e460c342d\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-2026-39350/ (Markdown: https://insights.sbomify.com/CVE-2026-39350/index.md)","id":"CVE-2026-39350","markdown":"https://insights.sbomify.com/CVE-2026-39350/index.md","name":"CVE-2026-39350","record":{"aliases":["GHSA-9gcg-w975-3rjh","GO-2026-5289","MINI-257f-5q98-xp4m","MINI-2jgm-xwfj-cvjf","MINI-5xgg-cxmw-fcp6","MINI-6g8r-4663-4355","MINI-6gc2-qf44-mp6p","MINI-75jr-2397-f24w","MINI-8hcg-m969-9f5f","MINI-c594-wpp3-7qqx","MINI-jpc7-2jj3-4mpp","MINI-m2fj-mjwq-ww28","MINI-mf4q-f29f-hw5q","MINI-xf6j-q5qx-4vf5"],"analysis":{"component_type":"cloud_service","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Istio service mesh","requires_auth":"low_privilege","summary":"Attackers can bypass Istio AuthorizationPolicy rules by exploiting regex dot matching in service account names, allowing unauthorized access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"istio","vendor":"istio"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-185","name":"Incorrect Regular Expression"}],"description":"Istio is an open platform to connect, manage, and secure microservices. In versions 1.25.0 through 1.27.8, 1.28.0 through 1.28.5, 1.29.0, and 1.29.1, the serviceAccounts and notServiceAccounts fields in AuthorizationPolicy incorrectly interpret dots (.) as a regular expression matcher. Because . is a valid character in a service account name, an AuthorizationPolicy ALLOW rule targeting a service account such as cert-manager.io also matches cert-manager-io, cert-managerXio, etc. A DENY rule targeting the same name fails to block those variants. Fixes are available in versions 1.29.2, 1.28.6, and 1.27.9.","ecosystems":["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":"Istio AuthorizationPolicy Incorrect Regex Matching of Dots in serviceAccounts Fields Allows Policy Bypass","id":"CVE-2026-39350","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Frappe allows unrestricted Doctype access via API exploit","id":"CVE-2026-39351"},"packages":[{"ecosystem":"Go","fixed":["0.0.0-20260403004500-692e460c342d"],"introduced":["0.0.0-20241024090207-0bf27d49ba4b"],"last_affected":[],"package":"istio.io/istio","purl":null,"source":"GHSA-9gcg-w975-3rjh"},{"ecosystem":"Go","fixed":["0.0.0-20260403004500-692e460c342d"],"introduced":["0.0.0-20241024090207-0bf27d49ba4b"],"last_affected":[],"package":"istio.io/istio","purl":"pkg:golang/istio.io/istio","source":"GHSA-9gcg-w975-3rjh"},{"ecosystem":"Go","fixed":["0.0.0-20260403004500-692e460c342d"],"introduced":["0.0.0-20241024090207-0bf27d49ba4b"],"last_affected":[],"package":"istio.io/istio","purl":"pkg:golang/istio.io/istio","source":"GO-2026-5289"}],"prev":{"headline":"OrangeHRM Uses AES-ECB for Sensitive Data Encryption Enables Pattern Disclosure","id":"CVE-2026-39349"},"products":["istio"],"published":"2026-04-15","related":[{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2021-31921","kev_date_added":null,"published":"2021-06-02"},{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2021-34824","kev_date_added":null,"published":"2021-06-29"},{"cvss_score":8.7,"headline":"Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.","id":"CVE-2026-31837","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":8.3,"headline":"Authorization Policy Bypass Due to Case Insensitive Host Comparison","id":"CVE-2021-39155","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":8.1,"headline":"Fragments in Path May Lead to Authorization Policy Bypass","id":"CVE-2021-39156","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":7.6,"headline":"Istio may allow identity impersonation if user has localhost access","id":"CVE-2022-39388","kev_date_added":null,"published":"2022-11-10"},{"cvss_score":7.5,"headline":"Istio vulnerable to denial of service attack due to Golang Regex Library","id":"CVE-2022-39278","kev_date_added":null,"published":"2022-10-13"}],"sources":[{"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":"2026-04-16","vendors":["istio"]},"summary":"Attackers can bypass Istio AuthorizationPolicy rules by exploiting regex dot matching in service account names, allowing unauthorized access.","url":"https://insights.sbomify.com/CVE-2026-39350/"}