Vulnerabilities in pkg:golang/github.com/hashicorp/consul

PACKAGE
Advisory Identifier: GHSA-cpfq-66p2-336j
Advisory Summary

CVE-2026-2808 is a MODERATE (CVSS 6.8) consul is vulnerable to arbitrary vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Github.com/hashicorp/consul libraries in the Go ecosystem. The issue involves consul is vulnerable to arbitrary file read when configured with kubernetes authentication. Remediation is available by upgrading affected packages to version 1.18.21, 1.22.5, 1.21.11.

32 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/hashicorp/consul

32 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/hashicorp/consul. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-cpfq-66p2-336j CVE-2026-2808 MODERATE Consul is vulnerable to arbitrary file read when configured with Kubernetes authentication
GHSA-qh7p-pfq3-677h CVE-2025-11375 MODERATE Consul event endpoint is vulnerable to denial of service
GHSA-7g3r-8c6v-hfmr CVE-2025-11374 MODERATE Consul key/value endpoint is vulnerable to denial of service
GHSA-5c4w-8hhh-3c3h CVE-2024-10006 MODERATE Hashicorp Consul Improper Neutralization of HTTP Headers for Scripting Syntax vulnerability
GHSA-99wr-c2px-grmh CVE-2024-10086 MODERATE Hashicorp Consul Cross-site Scripting vulnerability
GHSA-chgm-7r52-whjj CVE-2024-10005 HIGH Hashicorp Consul Path Traversal vulnerability
GHSA-hr3v-8cp3-68rf CVE-2021-41803 HIGH HashiCorp Consul does not properly validate node or segment names prior to usage in JWT claim assertions
GHSA-9rhf-q362-77mx CVE-2023-3518 HIGH Consul JWT Auth in L7 Intentions Allow for Mismatched Service Identity and JWT Providers
GHSA-6m72-467w-94rh CVE-2020-28053 MODERATE Privilege Escalation in HashiCorp Consul
GHSA-496g-fr33-whrf CVE-2020-25201 HIGH Denial of service in HashiCorp Consul
GHSA-hwqm-x785-qh8p CVE-2020-12797 MODERATE Incorrect Permission Assignment for Critical Resource in Hashicorp Consul
GHSA-q2qr-3c2p-9235 CVE-2020-12758 MODERATE Denial of Service (DoS) in HashiCorp Consul
GHSA-p2j5-3f4c-224r CVE-2020-13170 MODERATE Improper Input Validation in HashiCorp Consul
GHSA-rqjq-mrgx-85hp CVE-2020-13250 HIGH Allocation of Resources Without Limits or Throttling in Hashicorp Consul
GHSA-h65h-v7fw-4p38 CVE-2019-12291 HIGH HashiCorp Consul Incorrect Access Control vulnerability
GHSA-23jv-v6qj-3fhh CVE-2020-7219 HIGH Denial of Service (DoS) in HashiCorp Consul
GHSA-fhm8-cxcv-pwvc CVE-2019-8336 HIGH HashiCorp Consul Access Restriction Bypass
GHSA-wj6x-hcc2-f32j CVE-2023-0845 MODERATE Consul Server Panic when Ingress and API Gateways Configured with Peering Connections
GHSA-m69r-9g56-7mv8 CVE-2022-40716 MODERATE HashiCorp Consul vulnerable to authorization bypass
GHSA-4qvx-qq5w-695p CVE-2018-19653 MODERATE HashiCorp Consul can use cleartext agent-to-agent RPC communication
GHSA-q7fx-wm2p-qfj8 CVE-2019-9764 HIGH HashiCorp Consul vulnerable to Origin Validation Error
GHSA-8xmx-h8rq-h94j CVE-2020-25864 MODERATE HashiCorp Consul Cross-site Scripting vulnerability
GHSA-c57c-7hrj-6q6v CVE-2023-1297 MODERATE Hashicorp Consul vulnerable to denial of service
GHSA-rqjq-ww83-wv5c CVE-2023-2816 HIGH Hashicorp Consul allows user with service:write permissions to patch remote proxy instances
GHSA-q6h7-4qgw-2j9p CVE-2022-29153 HIGH Hashicorp Consul HTTP health check endpoints returning an HTTP redirect may be abused as SSRF vector
GHSA-gw2g-hhc9-wgjh CVE-2022-3920 HIGH Missing Authorization in HashiCorp Consul
GHSA-hj93-5fg3-3chr CVE-2022-24687 MODERATE HashiCorp Consul Ingress Gateway Panic Can Shutdown Servers
GHSA-25gf-8qrr-g78r CVE-2021-32574 HIGH Hashicorp Consul Missing SSL Certificate Validation
GHSA-8h2g-r292-j8xh CVE-2021-36213 HIGH HashiCorp Consul L7 deny intention results in an allow action
GHSA-ccw8-7688-vqx4 CVE-2021-37219 HIGH HashiCorp Consul Privilege Escalation Vulnerability
GHSA-6hw5-6gcx-phmw CVE-2021-38698 MODERATE HashiCorp Consul and Consul Enterprise 1.10.1 Txn.Apply endpoint allowed services to register proxies for other services, enabling access to service traffic.
GHSA-r9w6-rhh9-7v53 CVE-2020-7955 MODERATE Incorrect Authorization in HashiCorp Consul

CVE-2026-2808 at a Glance

CVE Identifier CVE-2026-2808
GHSA Identifier GHSA-cpfq-66p2-336j
Severity MODERATE
CVSS v3.1 Base Score 6.8
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Github.com/hashicorp/consul
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-2808

To remediate this vulnerability, upgrade all affected Github.com/hashicorp/consul dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/hashicorp/consul fixed: 1.18.21
Upgrade github.com/hashicorp/consul to 1.18.21
github.com/hashicorp/consul fixed: 1.22.5
Upgrade github.com/hashicorp/consul to 1.22.5
github.com/hashicorp/consul fixed: 1.21.11
Upgrade github.com/hashicorp/consul to 1.21.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for github.com/hashicorp/consul

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-2808, inspect your project dependencies for Github.com/hashicorp/consul:

inspect dependencies for github.com/hashicorp/consul

Analyze the terminal output to locate any version of Github.com/hashicorp/consul in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.18.21), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In Github.com/hashicorp/consul, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

HashiCorp Consul and Consul Enterprise 1.18.20 up to 1.21.10 and 1.22.4 are vulnerable to arbitrary file read when configured with Kubernetes authentication. This vulnerability, CVE-2026-2808, is fixed in Consul 1.18.21, 1.21.11 and 1.22.5.

CVE-2026-2808 Affected Github.com/hashicorp/consul Versions

3 component(s)
Fixed Versions:
1.18.211.22.51.21.11
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hashicorp/consul
Go
< 1.18.21
1.18.21
github.com/hashicorp/consul
Go
≥ 1.22.0-rc1
< 1.22.5
1.22.5
github.com/hashicorp/consul
Go
≥ 1.19.0
< 1.21.11
1.21.11

References

Frequently Asked Questions

What is CVE-2026-2808?
CVE-2026-2808 is a security vulnerability in Github.com/hashicorp/consul involving Consul is vulnerable to arbitrary file read when configured with Kubernetes authentication under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Github.com/hashicorp/consul versions are affected?
Affected versions include releases prior to 1.18.21, 1.22.5, 1.21.11 across affected packages: github.com/hashicorp/consul.
What version fixes CVE-2026-2808?
Upgrading to 1.18.21, 1.22.5, 1.21.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/hashicorp/consul affected?
Yes, github.com/hashicorp/consul is affected in releases prior to 1.18.21, 1.22.5, 1.21.11. Upgrade your dependency to 1.18.21, 1.22.5, 1.21.11 or later.
What is the CVSS score of CVE-2026-2808?
CVE-2026-2808 has a CVSS v3.1 base score of 6.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-2808?
CVE-2026-2808 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check Go dependencies for CVE-2026-2808?
Run the dependency tree command: 'inspect dependencies for github.com/hashicorp/consul'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cpfq-66p2-336j",
  "modified" : "2026-03-24T21:03:57Z",
  "published" : "2026-03-12T00:31:17Z",
  "aliases" : [ "CVE-2026-2808" ],
  "summary" : "Consul is vulnerable to arbitrary file read when configured with Kubernetes authentication",
  "details" : "HashiCorp Consul and Consul Enterprise 1.18.20 up to 1.21.10 and 1.22.4 are vulnerable to arbitrary file read when configured with Kubernetes authentication. This vulnerability, CVE-2026-2808, is fixed in Consul 1.18.21, 1.21.11 and 1.22.5.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.18.21"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.22.0-rc1"
      }, {
        "fixed" : "1.22.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/consul"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.19.0"
      }, {
        "fixed" : "1.21.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-2808"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.hashicorp.com/t/hcsec-2026-02-consul-vulnerable-to-arbitrary-file-reads-through-the-vault-kubernetes-authentication-provider/77232"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/consul"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2026-4690"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-59" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-12T17:34:04Z",
    "nvd_published_at" : "2026-03-12T00:16:11Z"
  }
}