{"id":"CVE-2026-122314","kind":"vulnerability","aliases":["CVE-2026-122314"],"related":[],"title":"Kyverno: unchecked type assertion lets submitted resources crash policy engine","description":"Kyverno before 1.19.2 contains an unchecked type assertion in its variable-substitution engine that allows users who can submit resources to crash the policy engine. Attackers can submit resources with non-string fields referenced by {{- variable }} shallow substitution in policies, causing a panic that yields webhook denial of service and policy bypass under failurePolicy Ignore.","summary":"Kyverno versions before 1.19.2 have an unchecked type assertion in the variable-substitution engine. A user who can submit Kubernetes resources can crash the policy engine, causing webhook denial of service and policy bypass when failurePolicy is Ignore.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","kubernetes","kyverno","self-hosted"],"not_affected_if":["no-shallow-substitution-policies","version-1.19.2-or-later"],"how_to_check":"- Check the installed Kyverno version, for example with `kubectl get deploy -A -l app.kubernetes.io/name=kyverno -o jsonpath='{.items[*].spec.template.spec.containers[*].image}'`\n- Look for policies that use `{{- variable }}` shallow substitution on fields that may hold non-string values\n- Check whether webhook failurePolicy is set to `Ignore`","fix":"- Kyverno: move to `1.19.2` or later","status":"open","published_at":"2026-11-05T03:17:24+00:00","first_seen_at":"2026-11-05T03:31:41+00:00","triaged_at":"2026-11-05T03:33:15+00:00","updated_at":"2026-11-05T03:33:15+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-11-05T03:33:15Z","model":"claude-haiku-5-5","output":{"fix":"- Kyverno: move to `1.19.2` or later","reach":"network","title":"Kyverno: unchecked type assertion lets submitted resources crash policy engine","impact":"medium","summary":"Kyverno versions before 1.19.2 have an unchecked type assertion in the variable-substitution engine. A user who can submit Kubernetes resources can crash the policy engine, causing webhook denial of service and policy bypass when failurePolicy is Ignore.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["kyverno","kubernetes","self-hosted"],"confidence":0.7,"fix_status":"available","needs_auth":"yes","worst_case":"policy engine crashes, admission bypassed under Ignore failurePolicy","analyst_note":"","how_to_check":"- Check the installed Kyverno version, for example with `kubectl get deploy -A -l app.kubernetes.io/name=kyverno -o jsonpath='{.items[*].spec.template.spec.containers[*].image}'`\n- Look for policies that use `{{- variable }}` shallow substitution on fields that may hold non-string values\n- Check whether webhook failurePolicy is set to `Ignore`","plain_action":"","needs_analyst":false,"not_affected_if":["version-1.19.2-or-later","no-shallow-substitution-policies"],"who_is_affected":"Clusters running Kyverno before 1.19.2 whose policies use shallow variable substitution on fields that can carry non-string values. Users who can submit resources to the cluster are the ones who can trigger the crash. Clusters on newer versions, or with no such policies, can skip it.","user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000734,"input_tokens":4288,"output_tokens":610,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-122314':13A,16A '-2026':12A,15A '1.19.2':26B,64C 'allow':77C 'assert':4A,31B,69C 'attack':88C 'bypass':57B,115C 'caus':50B,104C 'contain':65C 'crash':8A,46B,84C 'cve':11A,14A 'denial':52B,110C 'engin':10A,37B,49B,75C,87C 'failurepolici':59B,117C 'field':96C 'host':22B 'ignor':61B,118C 'infrastructur':17B 'kubernet':18B,43B 'kyverno':1A,19B,23B,62C 'let':5A 'non':94C 'non-str':93C 'panic':106C 'polici':9A,48B,56B,86C,103C,114C 'referenc':97C 'resourc':7A,44B,82C,91C 'self':21B 'self-host':20B 'servic':54B,112C 'shallow':100C 'string':95C 'submit':6A,42B,81C,90C 'substitut':36B,74C,101C 'type':3A,30B,68C 'uncheck':2A,29B,67C 'user':39B,78C 'variabl':35B,73C,99C 'variable-substitut':34B,72C 'version':24B 'webhook':51B,109C 'yield':108C","nicknames":[],"mitigations":[],"who_affected":"Clusters running Kyverno before 1.19.2 whose policies use shallow variable substitution on fields that can carry non-string values. Users who can submit resources to the cluster are the ones who can trigger the crash. Clusters on newer versions, or with no such policies, can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","kubernetes","kyverno","selfhosted"],"campaign_type":null,"first_public_at":"2026-10-21T15:52:55+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-122314","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-122314","severity":null,"published_at":"2026-11-05T03:17:24+00:00","modified_at":"2026-11-05T03:17:24+00:00","first_seen_at":"2026-11-05T03:31:41+00:00","fetched_at":"2026-11-05T03:31:41+00:00","note":null}],"documents":[{"id":72708,"url":"https://github.com/kyverno/kyverno/security/advisories/GHSA-x4xq-p8g4-6fwg","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-21T15:52:55+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":72711,"url":"https://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-shallow-variable-substitution-panic","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}