{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-31837 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-31837 is a high-severity vulnerability in istio, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-31837 and fix it if it is affected.\n\nWhat it is: CVE-2026-31837 is a high-severity vulnerability in istio, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-31837 in the wild and no public exploit code.\n\nAffected product: istio. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-31837/ (Markdown: https://insights.sbomify.com/CVE-2026-31837/index.md)","id":"CVE-2026-31837","markdown":"https://insights.sbomify.com/CVE-2026-31837/index.md","name":"CVE-2026-31837","record":{"aliases":["CLEANSTART-2026-IN05480","GHSA-v75c-crr9-733c","MINI-7wj6-6v2g-rcjr","MINI-82qv-2q2m-c9jp","MINI-86wf-pgj9-g3jj","MINI-87ph-2c98-qjvg","MINI-963h-xwc6-6cx6","MINI-c3pq-v7p8-4jv7","MINI-cxf6-672q-vv23","MINI-fhw9-vpfh-jq6m","MINI-h66q-g69m-5r5p","MINI-jm92-hjx6-v5w9","MINI-pmpp-4ppm-p558","MINI-qp73-3mq2-w73j","MINI-rmhh-2vx3-7v87","MINI-v8jc-r8mv-xpp2","MINI-vgpj-8rxp-3pg7","MINI-x9wx-q7wp-2fq2"],"analysis":{"component_type":"cloud_service","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Istio service mesh","requires_auth":"none","summary":"Istio users face exposure of hardcoded private key material when JWKS fetches fail, requiring an upgrade to secure service mesh authentication.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"istio","vendor":"istio"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1392","name":"Use of Default Credentials"},{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"description":"Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a user of Istio is impacted if the JWKS resolver becomes unavailable or the fetch fails, exposing hardcoded defaults regardless of use of the RequestAuthentication resource. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.","ecosystems":[],"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 JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.","id":"CVE-2026-31837","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Auth bypass in istio","id":"CVE-2026-31838"},"packages":[],"prev":{"headline":"Mass Assignment Privilege Escalation in Checkmate","id":"CVE-2026-31836"},"products":["istio"],"published":"2026-03-10","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":8.3,"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":"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-20","vendors":["istio"]},"summary":"Istio users face exposure of hardcoded private key material when JWKS fetches fail, requiring an upgrade to secure service mesh authentication.","url":"https://insights.sbomify.com/CVE-2026-31837/"}