{"id":"CVE-2026-105765","kind":"vulnerability","aliases":["CVE-2026-105765"],"related":[],"title":"HashiCorp Consul: authorization bypass exposes service mesh leaf certificates and private keys","description":"HashiCorp Consul and Consul Enterprise 1.17.0 up to 2.0.4 are vulnerable to an authorization bypass in the agent's service mesh leaf certificate API that may allow an attacker without a valid ACL token to retrieve a cached service leaf certificate and its private key. This vulnerability (CVE-2026-105765) is fixed in Consul Community Edition 2.1.0 and Consul Enterprise 2.1.0 and 1.21.19.","summary":"Consul versions 1.17.0 through 2.0.4 have an authorization bypass in the agent's service mesh leaf certificate API. An attacker without a valid ACL token can retrieve a cached service leaf certificate and its private key.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["consul","infrastructure","kubernetes","self-hosted","service-mesh"],"not_affected_if":["versions-outside-range"],"how_to_check":"- Run `consul version` on each agent and server and compare against the fixed versions.\n- Check whether the agent's leaf certificate API is reachable without an ACL token (unknown from the sources).","fix":"- Upgrade Consul Community Edition to `2.1.0`.\n- Upgrade Consul Enterprise to `2.1.0`, or `1.21.19` on the 1.x line.","status":"open","published_at":"2026-10-26T18:17:28+00:00","first_seen_at":"2026-10-26T18:31:43+00:00","triaged_at":"2026-10-26T18:33:50+00:00","updated_at":"2026-10-26T18:33:50+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-26T18:33:50Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade Consul Community Edition to `2.1.0`.\n- Upgrade Consul Enterprise to `2.1.0`, or `1.21.19` on the 1.x line.","reach":"network","title":"HashiCorp Consul: authorization bypass exposes service mesh leaf certificates and private keys","impact":"high","summary":"Consul versions 1.17.0 through 2.0.4 have an authorization bypass in the agent's service mesh leaf certificate API. An attacker without a valid ACL token can retrieve a cached service leaf certificate and its private key.","category":"infrastructure","nicknames":[],"who_cares":["consul","service-mesh","self-hosted","kubernetes"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker obtains a service leaf certificate and its private key, enabling impersonation within the mesh.","analyst_note":"Confirm the default reachability of the agent leaf certificate API and whether the cache-based retrieval needs any specific setting; check the HashiCorp advisory for details.","how_to_check":"- Run `consul version` on each agent and server and compare against the fixed versions.\n- Check whether the agent's leaf certificate API is reachable without an ACL token (unknown from the sources).","needs_analyst":true,"not_affected_if":["versions-outside-range"],"who_is_affected":"Teams running Consul 1.17.0 through 2.0.4 as a service mesh, including Consul Enterprise, where the agent's leaf certificate API can be reached. Exposure depends on the agent API being reachable by an attacker without a valid ACL token; the sources do not say how it is reached by default. Teams on versions outside that range can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000652,"input_tokens":3394,"output_tokens":625,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-105765':15A,18A,113C '-2026':14A,17A,112C '1.17.0':30B,69C '1.21.19':126C '2.0.4':32B,72C '2.1.0':120C,124C 'acl':51B,96C 'agent':39B,81C 'allow':90C 'api':45B,87C 'attack':47B,92C 'author':3A,35B,77C 'bypass':4A,36B,78C 'cach':56B,101C 'certif':9A,44B,59B,86C,104C 'communiti':118C 'consul':2A,19B,28B,65C,67C,117C,122C 'cve':13A,16A,111C 'edit':119C 'enterpris':68C,123C 'expos':5A 'fix':115C 'hashicorp':1A,64C 'host':24B 'infrastructur':20B 'key':12A,63B,108C 'kubernet':21B 'leaf':8A,43B,58B,85C,103C 'may':89C 'mesh':7A,27B,42B,84C 'privat':11A,62B,107C 'retriev':54B,99C 'self':23B 'self-host':22B 'servic':6A,26B,41B,57B,83C,102C 'service-mesh':25B 'token':52B,97C 'valid':50B,95C 'version':29B 'vulner':74C,110C 'without':48B,93C","nicknames":[],"mitigations":[],"who_affected":"Teams running Consul 1.17.0 through 2.0.4 as a service mesh, including Consul Enterprise, where the agent's leaf certificate API can be reached. Exposure depends on the agent API being reachable by an attacker without a valid ACL token; the sources do not say how it is reached by default. Teams on versions outside that range can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-26T18:17:28+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"security@hashicorp.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105765","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105765","severity":null,"published_at":"2026-10-26T18:17:28+00:00","modified_at":"2026-10-26T18:17:28+00:00","first_seen_at":"2026-10-26T18:31:43+00:00","fetched_at":"2026-10-26T18:31:43+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}