{"answers":{"affected":"1 open source package ship an affected version, including haproxy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-0836 in the wild and no public exploit code.","fix":"Upgrade haproxy to a fixed version for your release line: 2.1.1, 2.2.27, 2.3.1 or 2.4.22.","what":"CVE-2023-0836 is a high-severity vulnerability in HAProxy, published on 29 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-0836 and fix it if it is affected.\n\nWhat it is: CVE-2023-0836 is a high-severity vulnerability in HAProxy, published on 29 Mar 2023. 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-2023-0836 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- haproxy (Bitnami): affected from 2.1.0; fixed in 2.1.1, 2.2.27, 2.3.1, 2.4.22, 2.5.12, 2.6.9, 2.7.1\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-2023-0836/ (Markdown: https://insights.sbomify.com/CVE-2023-0836/index.md)","id":"CVE-2023-0836","markdown":"https://insights.sbomify.com/CVE-2023-0836/index.md","name":"CVE-2023-0836","record":{"aliases":["ALSA-2023:6496","BIT-haproxy-2023-0836","CLSA-2025-1736284126","DEBIAN-CVE-2023-0836","DSA-5388-1","GHSA-xhfw-qhxr-hjhq","RHSA-2023:6496","UBUNTU-CVE-2023-0836","USN-5994-1"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"HAProxy load balancer","requires_auth":"none","summary":"An attacker can read uninitialized memory from HAProxy connection buffers, potentially disclosing sensitive data to FastCGI backends.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"haproxy","vendor":"haproxy"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-459","name":"Incomplete Cleanup"},{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"description":"An information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1. There are 5 bytes left uninitialized in the connection buffer when encoding the FCGI_BEGIN_REQUEST record. Sensitive data may be disclosed to configured FastCGI backends in an unexpected way.","ecosystems":["AlmaLinux:9","Bitnami","Red Hat:enterprise_linux:9::appstream"],"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":"Information disclosure in HAProxy","id":"CVE-2023-0836","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"information_disclosure","year":"2023"},"n_packages":5,"n_references":2,"next":{"headline":"Missing authorization in Remote","id":"CVE-2023-0837"},"packages":[{"ecosystem":"Bitnami","fixed":["2.1.1","2.2.27","2.3.1","2.4.22","2.5.12","2.6.9","2.7.1"],"introduced":["2.1.0","2.2.0","2.3.0","2.4.0","2.5.0","2.6.0","2.7.0"],"last_affected":[],"package":"haproxy","purl":"pkg:bitnami/haproxy","source":"BIT-haproxy-2023-0836"},{"ecosystem":"AlmaLinux:9","fixed":["2.4.22-1.el9"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/almalinux/haproxy","source":"ALSA-2023:6496"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["0:2.4.22-1.el9"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2023:6496"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["0:2.4.22-1.el9"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2023:6496"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["0:2.4.22-1.el9"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2023:6496"}],"prev":{"headline":"markdown-pdf 11.0.0 - Local File Read via Server Side XSS","id":"CVE-2023-0835"},"products":["HAProxy"],"published":"2023-03-29","related":[{"cvss_score":9,"headline":"HAProxy - Integer Overflow in FCGI Demux Record Length Field","id":"CVE-2026-55203","kev_date_added":null,"published":"2026-06-18"},{"cvss_score":8.7,"headline":"HAProxy - NULL Pointer Dereference in hpack_dht_insert Function","id":"CVE-2026-55204","kev_date_added":null,"published":"2026-06-18"},{"cvss_score":8.2,"headline":"Information disclosure in n/a","id":"CVE-2023-45539","kev_date_added":null,"published":"2023-11-28"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2024-45506","kev_date_added":null,"published":"2024-09-04"},{"cvss_score":7.5,"headline":"Other in n/a","id":"CVE-2019-18277","kev_date_added":null,"published":"2019-10-23"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2019-14241","kev_date_added":null,"published":"2019-07-23"}],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"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":"Red Hat","prefix":"RHSA"},{"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":"2025-02-18","vendors":["n/a"]},"summary":"An attacker can read uninitialized memory from HAProxy connection buffers, potentially disclosing sensitive data to FastCGI backends.","url":"https://insights.sbomify.com/CVE-2023-0836/"}