{"answers":{"affected":"3 open source packages ship an affected version, including h11.","exploited":"There is no known exploitation of CVE-2025-43859 in the wild and no public exploit code.","fix":"Upgrade h11 to 0.16.0 or later.","what":"CVE-2025-43859 is a critical vulnerability in python-hyper h11, published on 24 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-43859 and fix it if it is affected.\n\nWhat it is: CVE-2025-43859 is a critical vulnerability in python-hyper h11, published on 24 Apr 2025. 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-2025-43859 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- h11 (PyPI): affected all versions; fixed in 0.16.0\n- h11 (PyPI): affected all versions; fixed in 0.16.0\n- h11 (PyPI): affected all versions; fixed in 0.16.0\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-2025-43859/ (Markdown: https://insights.sbomify.com/CVE-2025-43859/index.md)","id":"CVE-2025-43859","markdown":"https://insights.sbomify.com/CVE-2025-43859/index.md","name":"CVE-2025-43859","record":{"aliases":["CLEANSTART-2026-MQ93716","CLEANSTART-2026-UA31108","CLSA-2026-1767571924","CLSA-2026-1790929139","DEBIAN-CVE-2025-43859","GHSA-vqfr-h8mv-ghfj","MINI-ggmr-vfcf-g97w","MINI-qmq9-59w4-rgr3","OESA-2025-1496","OESA-2025-1497","PYSEC-2026-348","RHSA-2025:7535","RHSA-2025:7536","ROOT-APP-PYPI-CVE-2025-43859","SUSE-SU-2025:1430-1","SUSE-SU-2025:20330-1","SUSE-SU-2025:20331-1","UBUNTU-CVE-2025-43859","USN-7503-1","openSUSE-SU-2025:15032-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Python HTTP library","requires_auth":"none","summary":"Attackers can perform request smuggling by exploiting lenient chunked-encoding parsing in the h11 library when used with a vulnerable proxy.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.","ecosystems":["PyPI","Red Hat:openstack:17.1::el9","Red Hat:openstack:18.0::el9","SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","SUSE:Linux Enterprise Module for Python 3 15 SP6","SUSE:Linux Enterprise Server 15 SP4-LTSS","SUSE:Linux Enterprise Server 15 SP5-LTSS","SUSE:Linux Enterprise Server for SAP Applications 15 SP4","SUSE:Linux Enterprise Server for SAP Applications 15 SP5","SUSE:Linux Micro 6.0","SUSE:Linux Micro 6.1","openSUSE:Leap 15.6","openSUSE:Tumbleweed"],"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":"h11 accepts some malformed Chunked-Encoding bodies","id":"CVE-2025-43859","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"other","year":"2025"},"n_packages":22,"n_references":2,"next":{"headline":"OpemEMR Vulnerable to Stored XSS Attack in the Additional Address Section of Patient Demographics","id":"CVE-2025-43860"},"packages":[{"ecosystem":"PyPI","fixed":["0.16.0"],"introduced":["0"],"last_affected":[],"package":"h11","purl":null,"source":"GHSA-vqfr-h8mv-ghfj"},{"ecosystem":"PyPI","fixed":["0.16.0"],"introduced":["0"],"last_affected":[],"package":"h11","purl":"pkg:pypi/h11","source":"GHSA-vqfr-h8mv-ghfj"},{"ecosystem":"PyPI","fixed":["0.16.0"],"introduced":["0"],"last_affected":[],"package":"h11","purl":"pkg:pypi/h11","source":"PYSEC-2026-348"},{"ecosystem":"Red Hat:openstack:17.1::el9","fixed":["0:0.12.0-2.1.el9ost"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/redhat/python-h11","source":"RHSA-2025:7536"},{"ecosystem":"Red Hat:openstack:17.1::el9","fixed":["0:0.12.0-2.1.el9ost"],"introduced":["0"],"last_affected":[],"package":"python3-h11","purl":"pkg:rpm/redhat/python3-h11","source":"RHSA-2025:7536"},{"ecosystem":"Red Hat:openstack:18.0::el9","fixed":["0:0.12.0-4.el9ost"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/redhat/python-h11","source":"RHSA-2025:7535"},{"ecosystem":"Red Hat:openstack:18.0::el9","fixed":["0:0.12.0-4.el9ost"],"introduced":["0"],"last_affected":[],"package":"python3-h11","purl":"pkg:rpm/redhat/python3-h11","source":"RHSA-2025:7535"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP6","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP6","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"SUSE:Linux Micro 6.0","fixed":["0.16.0-1.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Micro%206.0","source":"SUSE-SU-2025:20331-1"},{"ecosystem":"SUSE:Linux Micro 6.0","fixed":["0.16.3-7.1"],"introduced":["0"],"last_affected":[],"package":"python-httpcore","purl":"pkg:rpm/suse/python-httpcore\u0026distro=SUSE%20Linux%20Micro%206.0","source":"SUSE-SU-2025:20331-1"},{"ecosystem":"SUSE:Linux Micro 6.1","fixed":["0.16.0-slfo.1.1_1.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/suse/python-h11\u0026distro=SUSE%20Linux%20Micro%206.1","source":"SUSE-SU-2025:20330-1"},{"ecosystem":"SUSE:Linux Micro 6.1","fixed":["0.16.3-slfo.1.1_2.1"],"introduced":["0"],"last_affected":[],"package":"python-httpcore","purl":"pkg:rpm/suse/python-httpcore\u0026distro=SUSE%20Linux%20Micro%206.1","source":"SUSE-SU-2025:20330-1"},{"ecosystem":"openSUSE:Leap 15.6","fixed":["0.14.0-150400.9.6.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/opensuse/python-h11\u0026distro=openSUSE%20Leap%2015.6","source":"SUSE-SU-2025:1430-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["0.16.0-1.1"],"introduced":["0"],"last_affected":[],"package":"python-h11","purl":"pkg:rpm/opensuse/python-h11\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2025:15032-1"}],"prev":{"headline":"YoutubeDLSharp allows command injection on windows system due to non sanitized arguments","id":"CVE-2025-43858"},"products":["h11"],"published":"2025-04-24","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":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"total"},"state":"PUBLISHED","updated":"2025-04-24","vendors":["python-hyper"]},"summary":"Attackers can perform request smuggling by exploiting lenient chunked-encoding parsing in the h11 library when used with a vulnerable proxy.","url":"https://insights.sbomify.com/CVE-2025-43859/"}