{"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-2026-26309 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-26309 is a medium-severity memory corruption 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-2026-26309 and fix it if it is affected.\n\nWhat it is: CVE-2026-26309 is a medium-severity memory corruption 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-2026-26309 in the wild and no public exploit code.\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-2026-26309/ (Markdown: https://insights.sbomify.com/CVE-2026-26309/index.md)","id":"CVE-2026-26309","markdown":"https://insights.sbomify.com/CVE-2026-26309/index.md","name":"CVE-2026-26309","record":{"aliases":["BIT-envoy-2026-26309","GHSA-56cj-wgg3-x943"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Envoy proxy","requires_auth":"none","summary":"An off-by-one write in Envoy's JSON escaper can corrupt string termination, leading to crashes or out-of-bounds reads.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"envoy","vendor":"envoyproxy"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-193","name":"Off-by-one Error"}],"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, an off-by-one write in Envoy::JsonEscaper::escapeString() can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. 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 off-by-one write in JsonEscaper::escapeString()","id":"CVE-2026-26309","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"envoyproxy:envoy","products":["envoyproxy:envoy"],"type":"memory_corruption","year":"2026"},"n_packages":9,"n_references":1,"next":{"headline":"Crash for scoped ip address in Envoy during DNS","id":"CVE-2026-26310"},"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-2026-26309"},{"ecosystem":"Go","fixed":[],"introduced":[],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-56cj-wgg3-x943"},{"ecosystem":"Go","fixed":[],"introduced":[],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-56cj-wgg3-x943"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.34.12"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-56cj-wgg3-x943"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.34.12"],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-56cj-wgg3-x943"},{"ecosystem":"Go","fixed":[],"introduced":["1.35.0"],"last_affected":["1.35.8"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-56cj-wgg3-x943"},{"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-56cj-wgg3-x943"},{"ecosystem":"Go","fixed":[],"introduced":["1.36.0"],"last_affected":["1.36.4"],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-56cj-wgg3-x943"},{"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-56cj-wgg3-x943"}],"prev":{"headline":"Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation","id":"CVE-2026-26308"},"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-10","vendors":["envoyproxy"]},"summary":"An off-by-one write in Envoy's JSON escaper can corrupt string termination, leading to crashes or out-of-bounds reads.","url":"https://insights.sbomify.com/CVE-2026-26309/"}