{"answers":{"affected":"1 open source package ship an affected version, including haproxy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-55203 in the wild and no public exploit code.","fix":"Upgrade haproxy to a fixed version for your release line: 2.4.36, 2.6.30, 2.8.25 or 3.0.24.","what":"CVE-2026-55203 is a critical vulnerability in haproxy, published on 18 Jun 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-2026-55203 and fix it if it is affected.\n\nWhat it is: CVE-2026-55203 is a critical vulnerability in haproxy, published on 18 Jun 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-2026-55203 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- haproxy (Bitnami): affected all versions; fixed in 2.4.36, 2.6.30, 2.8.25, 3.0.24, 3.2.20, 3.4.1\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-2026-55203/ (Markdown: https://insights.sbomify.com/CVE-2026-55203/index.md)","id":"CVE-2026-55203","markdown":"https://insights.sbomify.com/CVE-2026-55203/index.md","name":"CVE-2026-55203","record":{"aliases":["AZL-90264","BIT-haproxy-2026-55203","CLSA-2026-1782725469","CLSA-2026-1782744931","DEBIAN-CVE-2026-55203","GHSA-58mj-cmhg-35rg","MINI-2cv6-5vf7-35j7","MINI-4rm8-7jh7-3hx8","MINI-66pv-v67f-vfwf","MINI-9369-j7pj-pprw","MINI-98v6-p9c6-929p","MINI-hvc9-w965-mx5v","MINI-jxm8-6g96-gvqw","MINI-r233-g37j-h7vv","UBUNTU-CVE-2026-55203"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["code_execution","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"HAProxy load balancer","requires_auth":"none","summary":"A malicious FastCGI backend can trigger an integer overflow in HAProxy, leading to parser desynchronization, potential request smuggling, or memory safety issues.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"haproxy","vendor":"haproxy"}],"cvss":{"score":9,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues.","ecosystems":["Bitnami"],"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":"HAProxy - Integer Overflow in FCGI Demux Record Length Field","id":"CVE-2026-55203","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":1,"n_references":2,"next":{"headline":"HAProxy - NULL Pointer Dereference in hpack_dht_insert Function","id":"CVE-2026-55204"},"packages":[{"ecosystem":"Bitnami","fixed":["2.4.36","2.6.30","2.8.25","3.0.24","3.2.20","3.4.1"],"introduced":["0","2.5.0","2.7.0","2.9.0","3.1.0","3.3.0"],"last_affected":[],"package":"haproxy","purl":"pkg:bitnami/haproxy","source":"BIT-haproxy-2026-55203"}],"prev":{"headline":"Tinyproxy - Stathost Detection Bypass via Host Header Manipulation","id":"CVE-2026-55202"},"products":["haproxy"],"published":"2026-06-18","related":[{"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":"Information disclosure in HAProxy","id":"CVE-2023-0836","kev_date_added":null,"published":"2023-03-29"},{"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":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-07-14","vendors":["haproxy"]},"summary":"A malicious FastCGI backend can trigger an integer overflow in HAProxy, leading to parser desynchronization, potential request smuggling, or memory safety issues.","url":"https://insights.sbomify.com/CVE-2026-55203/"}