CVE-2026-26310: Github.com/envoyproxy/envoy Envoy Vulnerable To Crash For Vulnerability
MODERATECVE-2026-26310 is a MODERATE (CVSS 5.9) envoy vulnerable to crash for vulnerability (CWE-20: Improper Input Validation) affecting Github.com/envoyproxy/envoy libraries in the Go ecosystem. The issue involves envoy vulnerable to crash for scoped ip address during dns. Remediation is available in the latest vendor maintenance releases.
CVE-2026-26310 at a Glance
Security Impact
CVSS: 5.9
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2026-26310
To remediate this vulnerability, upgrade all affected Github.com/envoyproxy/envoy dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/envoyproxy/envoy to Latest secure releaseUpgrade github.com/envoyproxy/envoy to Latest secure releaseUpgrade github.com/envoyproxy/envoy to Latest secure releaseUpgrade github.com/envoyproxy/envoy to Latest secure releaseRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/envoyproxy/envoyHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-26310, inspect your project dependencies for Github.com/envoyproxy/envoy:
inspect dependencies for github.com/envoyproxy/envoyAnalyze the terminal output to locate any version of Github.com/envoyproxy/envoy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Github.com/envoyproxy/envoy, 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
CVE-2026-26310 Affected Github.com/envoyproxy/envoy Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/envoyproxy/envoy
|
Go |
1.37.0
All 1 versions
1.37.0
|
None specified
|
|
github.com/envoyproxy/envoy
|
Go |
≥ 1.36.0
≤ 1.36.4
|
|
|
github.com/envoyproxy/envoy
|
Go |
≥ 1.35.0
≤ 1.35.8
|
|
|
github.com/envoyproxy/envoy
|
Go |
≤ 1.34.12
|
|
References
Frequently Asked Questions
What is CVE-2026-26310?
Which Github.com/envoyproxy/envoy versions are affected?
What version fixes CVE-2026-26310?
Is github.com/envoyproxy/envoy affected?
What is the CVSS score of CVE-2026-26310?
What CWE is associated with CVE-2026-26310?
How can I check Go dependencies for CVE-2026-26310?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-3cw6-2j68-868p",
"modified" : "2026-03-11T20:42:23Z",
"published" : "2026-03-10T18:16:26Z",
"aliases" : [ "CVE-2026-26310" ],
"summary" : "Envoy vulnerable to crash for scoped ip address during DNS",
"details" : "### Summary\n\nCalling `Utility::getAddressWithPort` with a scoped IPv6 addresses causes a crash. This utility is called in the data plane from the original_src filter and the dns filter.\n\n### Details\n\nThe crashing function is `Utility::getAddressWithPort`. The crash occurs if a string containing a scoped IPv6 address is passed to this function.\n\nThis vulnerability affects:\n\n1. The **original src filter**: If the filter is configured and the original source is a scoped IPv6 address, it will cause a crash.\n2. **DNS response address resolution**: If a DNS response contains a scoped IPv6 address, this will also trigger the crash.\n\n### PoC\n\nTo reproduce the vulnerability:\n\n1. **Method A (Original Src Filter):** Configure the `original src` filter in Envoy and provide a scoped IPv6 address as the original source.\n2. **Method B (DNS Resolution):** Trigger a DNS resolution process within Envoy where the DNS response contains a scoped IPv6 address.\n\n### Impact\n\nThis is a Denial of Service (DoS) vulnerability. It impacts users who have the `original src` filter configured or whose Envoy instances resolve addresses from DNS responses that may contain scoped IPv6 addresses.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/envoyproxy/envoy"
},
"versions" : [ "1.37.0" ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/envoyproxy/envoy"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.36.0"
}, {
"last_affected" : "1.36.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/envoyproxy/envoy"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.35.0"
}, {
"last_affected" : "1.35.8"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/envoyproxy/envoy"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "1.34.12"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3cw6-2j68-868p"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-26310"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/envoyproxy/envoy"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-20" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-10T18:16:26Z",
"nvd_published_at" : "2026-03-10T20:16:36Z"
}
}