{"answers":{"affected":"1 open source package ship an affected version, including haproxy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-55204 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-2026-55204 is a high-severity 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-2026-55204 and fix it if it is affected.\n\nWhat it is: CVE-2026-55204 is a high-severity 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-2026-55204 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-2026-55204/ (Markdown: https://insights.sbomify.com/CVE-2026-55204/index.md)","id":"CVE-2026-55204","markdown":"https://insights.sbomify.com/CVE-2026-55204/index.md","name":"CVE-2026-55204","record":{"aliases":["ALSA-2026:55859","AZL-90261","BIT-haproxy-2026-55204","CLSA-2026-1782820521","CLSA-2026-1782825341","CLSA-2026-1782825734","CLSA-2026-1782825982","CLSA-2026-1782895938","CLSA-2026-1782896085","CLSA-2026-1783527210","CLSA-2026-1784545904","DEBIAN-CVE-2026-55204","GHSA-4vj2-5mvx-3vcc","MINI-4m25-9563-59fx","MINI-7gfj-qvmf-8pf5","MINI-cchh-64mg-m8xg","MINI-jrgw-64h3-pqjq","MINI-vvmx-r2h2-wp8j","MINI-wfjm-jjjq-9f3p","MINI-wfr2-9r47-m97h","RHSA-2026:55859","RHSA-2026:55860","RHSA-2026:55861","RHSA-2026:55862","RLSA-2026:55859","UBUNTU-CVE-2026-55204"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"HAProxy load balancer","requires_auth":"none","summary":"An attacker can crash HAProxy worker processes by triggering a null pointer dereference during HPACK table insertions under memory pressure.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"haproxy","vendor":"haproxy"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"HAProxy through  3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service.","ecosystems":["AlmaLinux:8","Bitnami","Red Hat:enterprise_linux:8::appstream","Red Hat:rhel_aus:8.4::appstream","Red Hat:rhel_aus:8.6::appstream","Red Hat:rhel_e4s:8.8::appstream","Red Hat:rhel_eus_long_life:8.4::appstream","Red Hat:rhel_eus_long_life:8.6::appstream","Red Hat:rhel_tus:8.8::appstream","Rocky Linux:8"],"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 - NULL Pointer Dereference in hpack_dht_insert Function","id":"CVE-2026-55204","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":24,"n_references":2,"next":{"headline":"Hermes WebUI \u003c 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint","id":"CVE-2026-55205"},"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-2026-55204"},{"ecosystem":"AlmaLinux:8","fixed":["1.8.27-5.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/almalinux/haproxy","source":"ALSA-2026:55859"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.8.27-5.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55859"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.8.27-5.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55859"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.8.27-5.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55859"},{"ecosystem":"Red Hat:rhel_aus:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_aus:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_aus:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_aus:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_aus:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_aus:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55860"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55860"},{"ecosystem":"Red Hat:rhel_e4s:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55860"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.4::appstream","fixed":["0:1.8.27-2.el8_4.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55861"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_eus_long_life:8.6::appstream","fixed":["0:1.8.27-4.el8_6.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55862"},{"ecosystem":"Red Hat:rhel_tus:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/redhat/haproxy","source":"RHSA-2026:55860"},{"ecosystem":"Red Hat:rhel_tus:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debuginfo","purl":"pkg:rpm/redhat/haproxy-debuginfo","source":"RHSA-2026:55860"},{"ecosystem":"Red Hat:rhel_tus:8.8::appstream","fixed":["0:1.8.27-5.el8_8.2"],"introduced":["0"],"last_affected":[],"package":"haproxy-debugsource","purl":"pkg:rpm/redhat/haproxy-debugsource","source":"RHSA-2026:55860"},{"ecosystem":"Rocky Linux:8","fixed":["0:1.8.27-5.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"haproxy","purl":"pkg:rpm/rocky-linux/haproxy?distro=rocky-linux-8\u0026epoch=0","source":"RLSA-2026:55859"}],"prev":{"headline":"HAProxy - Integer Overflow in FCGI Demux Record Length Field","id":"CVE-2026-55203"},"products":["haproxy"],"published":"2026-06-18","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":8.2,"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":"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":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"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":"2026-07-14","vendors":["haproxy"]},"summary":"An attacker can crash HAProxy worker processes by triggering a null pointer dereference during HPACK table insertions under memory pressure.","url":"https://insights.sbomify.com/CVE-2026-55204/"}