{"answers":{"affected":"6 open source packages ship an affected version, including io.undertow:undertow-core. It affects 8 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12543 exists.","fix":"Upgrade io.undertow:undertow-core to a fixed version for your release line: 2.2.39.Final or 2.3.21.Final.","what":"CVE-2025-12543 is a critical server-side request forgery vulnerability in Redhat Jboss Enterprise Application Platform, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2025-12543 and fix it if it is affected.\n\nWhat it is: CVE-2025-12543 is a critical server-side request forgery vulnerability in Redhat Jboss Enterprise Application Platform, published on 7 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-12543 exists.\n\nAffected packages and fixed versions:\n- io.undertow:undertow-core (Maven): affected all versions; no fix listed\n- io.undertow:undertow-core (Maven): affected all versions; no fix listed\n- io.undertow:undertow-core (Maven): affected all versions; fixed in 2.2.39.Final\n- io.undertow:undertow-core (Maven): affected all versions; fixed in 2.2.39.Final\n- io.undertow:undertow-core (Maven): affected from 2.3.0.Alpha1; fixed in 2.3.21.Final\n- io.undertow:undertow-core (Maven): affected from 2.3.0.Alpha1; fixed in 2.3.21.Final\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-2025-12543/ (Markdown: https://insights.sbomify.com/CVE-2025-12543/index.md)","id":"CVE-2025-12543","markdown":"https://insights.sbomify.com/CVE-2025-12543/index.md","name":"CVE-2025-12543","record":{"aliases":["CLSA-2026-1770682162","DEBIAN-CVE-2025-12543","GHSA-j382-5jj3-vw4j","UBUNTU-CVE-2025-12543","USN-8144-1"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Java HTTP server library","requires_auth":"none","summary":"Attackers can exploit improper Host header validation in Undertow to perform SSRF, cache poisoning, or session hijacking.","user_interaction":"required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"build_of_apache_camel","vendor":"redhat"},{"product":"data_grid","vendor":"redhat"},{"product":"fuse","vendor":"redhat"},{"product":"jboss_enterprise_application_platform","vendor":"redhat"},{"product":"jboss_enterprise_application_platform_expansion_pack","vendor":"redhat"},{"product":"process_automation","vendor":"redhat"},{"product":"single_sign-on","vendor":"redhat"},{"product":"undertow","vendor":"redhat"}],"cvss":{"score":9.6,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applications. The Undertow library fails to properly validate the Host header in incoming HTTP requests.As a result, requests containing malformed or malicious Host headers are processed without rejection, enabling attackers to poison caches, perform internal network scans, or hijack user sessions.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Undertow HTTP server core doesn't properly validate the Host header in incoming HTTP requests","id":"CVE-2025-12543","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"redhat:jboss_enterprise_application_platform","products":["redhat:jboss_enterprise_application_platform","redhat:single_sign-on"],"type":"ssrf","year":"2025"},"n_packages":6,"n_references":20,"next":{"headline":"Information disclosure in Pixel Manager for WooCommerce – Conversion Tracking, Google Ads, GA4, TikTok, Dynamic Remarketing","id":"CVE-2025-12545"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":[],"last_affected":[],"package":"io.undertow:undertow-core","purl":null,"source":"GHSA-j382-5jj3-vw4j"},{"ecosystem":"Maven","fixed":[],"introduced":[],"last_affected":[],"package":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","source":"GHSA-j382-5jj3-vw4j"},{"ecosystem":"Maven","fixed":["2.2.39.Final"],"introduced":["0"],"last_affected":[],"package":"io.undertow:undertow-core","purl":null,"source":"GHSA-j382-5jj3-vw4j"},{"ecosystem":"Maven","fixed":["2.2.39.Final"],"introduced":["0"],"last_affected":[],"package":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","source":"GHSA-j382-5jj3-vw4j"},{"ecosystem":"Maven","fixed":["2.3.21.Final"],"introduced":["2.3.0.Alpha1"],"last_affected":[],"package":"io.undertow:undertow-core","purl":null,"source":"GHSA-j382-5jj3-vw4j"},{"ecosystem":"Maven","fixed":["2.3.21.Final"],"introduced":["2.3.0.Alpha1"],"last_affected":[],"package":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","source":"GHSA-j382-5jj3-vw4j"}],"prev":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2025-12542"},"products":["RHEL-8 based Middleware Containers","Red Hat Data Grid 8","Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9","Red Hat Fuse 7","Red Hat JBoss Enterprise Application Platform 7","Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7","Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7","Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7","Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8","Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9","Red Hat JBoss Enterprise Application Platform 7.4.24","Red Hat JBoss Enterprise Application Platform 8.0","Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8","Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9","Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8","Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9","Red Hat JBoss Enterprise Application Platform 8.1.3","Red Hat JBoss Enterprise Application Platform Expansion Pack","Red Hat Process Automation 7","Red Hat Single Sign-On 7.6 for RHEL 7","Red Hat Single Sign-On 7.6 for RHEL 8","Red Hat Single Sign-On 7.6 for RHEL 9","Red Hat Single Sign-On 7.6.13","Red Hat build of Apache Camel - HawtIO 4","Red Hat build of Apache Camel 4.14.4 for Spring Boot 3.5.11"],"published":"2026-01-07","related":[],"sources":[{"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":"total"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["Red Hat"]},"summary":"Attackers can exploit improper Host header validation in Undertow to perform SSRF, cache poisoning, or session hijacking.","url":"https://insights.sbomify.com/CVE-2025-12543/"}