{"id":"GHSA-3cw6-2j68-868p","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.","aliases":["BIT-envoy-2026-26310","CVE-2026-26310"],"modified":"2026-03-13T20:26:16.308245Z","published":"2026-03-10T18:16:26Z","database_specific":{"github_reviewed_at":"2026-03-10T18:16:26Z","nvd_published_at":"2026-03-10T20:16:36Z","cwe_ids":["CWE-20"],"severity":"MODERATE","github_reviewed":true},"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"}],"affected":[{"package":{"name":"github.com/envoyproxy/envoy","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/envoy"},"versions":["1.37.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3cw6-2j68-868p/GHSA-3cw6-2j68-868p.json"}},{"package":{"name":"github.com/envoyproxy/envoy","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.36.0"},{"last_affected":"1.36.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3cw6-2j68-868p/GHSA-3cw6-2j68-868p.json"}},{"package":{"name":"github.com/envoyproxy/envoy","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.35.0"},{"last_affected":"1.35.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3cw6-2j68-868p/GHSA-3cw6-2j68-868p.json"}},{"package":{"name":"github.com/envoyproxy/envoy","ecosystem":"Go","purl":"pkg:golang/github.com/envoyproxy/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.34.12"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-3cw6-2j68-868p/GHSA-3cw6-2j68-868p.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}