{"answers":{"affected":"9 open source packages ship an affected version, including github.com/envoyproxy/envoy and envoy. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26311 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-26311 is a medium-severity use after free 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-2026-26311 and fix it if it is affected.\n\nWhat it is: CVE-2026-26311 is a medium-severity use after free 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26311 exists.\n\nAffected packages and fixed versions:\n- github.com/envoyproxy/envoy (Go): affected all versions; no fix listed\n- github.com/envoyproxy/envoy (Go): affected all versions; no fix listed\n- github.com/envoyproxy/envoy (Go): affected all versions up to 1.34.12; no fix listed\n- github.com/envoyproxy/envoy (Go): affected all versions up to 1.34.12; no fix listed\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0 up to 1.35.8; no fix listed\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0 up to 1.35.8; no fix listed\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0 up to 1.36.4; no fix listed\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0 up to 1.36.4; no fix listed\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-2026-26311/ (Markdown: https://insights.sbomify.com/CVE-2026-26311/index.md)","id":"CVE-2026-26311","markdown":"https://insights.sbomify.com/CVE-2026-26311/index.md","name":"CVE-2026-26311","record":{"aliases":["BIT-envoy-2026-26311","GHSA-84xm-r438-86px"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Envoy proxy","requires_auth":"none","summary":"Attackers can trigger a use-after-free crash in Envoy proxy by sending data on reset streams, causing denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"envoy","vendor":"envoyproxy"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"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, a logic vulnerability in Envoy's HTTP connection manager (FilterManager) that allows for Zombie Stream Filter Execution. This issue creates a \"Use-After-Free\" (UAF) or state-corruption window where filter callbacks are invoked on an HTTP stream that has already been logically reset and cleaned up. The vulnerability resides in source/common/http/filter_manager.cc within the FilterManager::decodeData method. The ActiveStream object remains valid in memory during the deferred deletion window. If a DATA frame arrives on this stream immediately after the reset (e.g., in the same packet processing cycle), the HTTP/2 codec invokes ActiveStream::decodeData, which cascades to FilterManager::decodeData. FilterManager::decodeData fails to check the saw_downstream_reset_ flag. It iterates over the decoder_filters_ list and invokes decodeData() on filters that have already received onDestroy(). 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":"weaponised"},"has_fix":true,"headline":"Envoy HTTP: filter chain execution on reset streams causing UAF crash","id":"CVE-2026-26311","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"envoyproxy:envoy","products":["envoyproxy:envoy"],"type":"use_after_free","year":"2026"},"n_packages":9,"n_references":1,"next":{"headline":"Stalwart Mail Server has Out-of-Memory Denial of Service via Malformed Nested MIME Messages","id":"CVE-2026-26312"},"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-2026-26311"},{"ecosystem":"Go","fixed":[],"introduced":[],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":[],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.34.12"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.34.12"],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["1.35.0"],"last_affected":["1.35.8"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["1.35.0"],"last_affected":["1.35.8"],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["1.36.0"],"last_affected":["1.36.4"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-84xm-r438-86px"},{"ecosystem":"Go","fixed":[],"introduced":["1.36.0"],"last_affected":["1.36.4"],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-84xm-r438-86px"}],"prev":{"headline":"Crash for scoped ip address in Envoy during DNS","id":"CVE-2026-26310"},"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-10","vendors":["envoyproxy"]},"summary":"Attackers can trigger a use-after-free crash in Envoy proxy by sending data on reset streams, causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-26311/"}