{"answers":{"affected":"9 open source packages ship an affected version, including github.com/envoyproxy/envoy and envoy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-26308 in the wild and no public exploit code.","fix":"Upgrade github.com/envoyproxy/envoy to a fixed version for your release line: 1.34.13, 1.35.9, 1.36.5 or 1.37.1.","what":"CVE-2026-26308 is a high-severity authentication bypass vulnerability in Envoyproxy Envoy, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-26308 and fix it if it is affected.\n\nWhat it is: CVE-2026-26308 is a high-severity authentication bypass vulnerability in Envoyproxy Envoy, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-26308 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/envoyproxy/envoy (Go): affected all versions; fixed in 1.34.13\n- github.com/envoyproxy/envoy (Go): affected all versions; fixed in 1.34.13\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0; fixed in 1.35.9\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0; fixed in 1.35.9\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0; fixed in 1.36.5\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0; fixed in 1.36.5\n- github.com/envoyproxy/envoy (Go): affected from 1.37.0; fixed in 1.37.1\n- github.com/envoyproxy/envoy (Go): affected from 1.37.0; fixed in 1.37.1\n- envoy (Bitnami): affected all versions; fixed in 1.34.13, 1.35.9, 1.36.5, 1.37.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-26308/ (Markdown: https://insights.sbomify.com/CVE-2026-26308/index.md)","id":"CVE-2026-26308","markdown":"https://insights.sbomify.com/CVE-2026-26308/index.md","name":"CVE-2026-26308","record":{"aliases":["BIT-envoy-2026-26308","GHSA-ghc4-35x6-crw5"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Envoy proxy","requires_auth":"none","summary":"Attackers can bypass Envoy RBAC deny rules by sending duplicate headers, allowing unauthorized access to protected resources.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"envoy","vendor":"envoyproxy"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically \"Deny\" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation","id":"CVE-2026-26308","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"envoyproxy:envoy","products":["envoyproxy:envoy"],"type":"auth_bypass","year":"2026"},"n_packages":9,"n_references":2,"next":{"headline":"Envoy has an off-by-one write in JsonEscaper::escapeString()","id":"CVE-2026-26309"},"packages":[{"ecosystem":"Bitnami","fixed":["1.34.13","1.35.9","1.36.5","1.37.1"],"introduced":["0","1.35.0","1.36.0","1.37.0"],"last_affected":[],"package":"envoy","purl":"pkg:bitnami/envoy","source":"BIT-envoy-2026-26308"},{"ecosystem":"Go","fixed":["1.34.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.34.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.35.9"],"introduced":["1.35.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.35.9"],"introduced":["1.35.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.36.5"],"introduced":["1.36.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.36.5"],"introduced":["1.36.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.37.1"],"introduced":["1.37.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-ghc4-35x6-crw5"},{"ecosystem":"Go","fixed":["1.37.1"],"introduced":["1.37.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-ghc4-35x6-crw5"}],"prev":{"headline":"Gitea git grep search lacks a timeout","id":"CVE-2026-26307"},"products":["envoy"],"published":"2026-03-10","related":[{"cvss_score":10,"headline":"Trivial authentication bypass in Envoy","id":"CVE-2022-29226","kev_date_added":null,"published":"2022-06-09"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2019-18801","kev_date_added":null,"published":"2019-12-13"},{"cvss_score":9.8,"headline":"Security feature bypass in n/a","id":"CVE-2019-18802","kev_date_added":null,"published":"2019-12-13"},{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2020-35470","kev_date_added":null,"published":"2020-12-15"},{"cvss_score":8.6,"headline":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","id":"CVE-2024-23324","kev_date_added":null,"published":"2024-02-09"},{"cvss_score":8.6,"headline":"Envoy vulnerable to OAuth2 credentials exploit with permanent validity","id":"CVE-2023-35941","kev_date_added":null,"published":"2023-07-25"},{"cvss_score":8.6,"headline":"Incorrect handling of H2 GOAWAY + SETTINGS frames","id":"CVE-2021-39162","kev_date_added":null,"published":"2021-09-09"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-10","vendors":["envoyproxy"]},"summary":"Attackers can bypass Envoy RBAC deny rules by sending duplicate headers, allowing unauthorized access to protected resources.","url":"https://insights.sbomify.com/CVE-2026-26308/"}