{"answers":{"affected":"3 open source packages ship an affected version, including matrix-synapse. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-45078 in the wild and no public exploit code.","fix":"Upgrade matrix-synapse to 1.152.1 or later.","what":"CVE-2026-45078 is a medium-severity denial of service vulnerability in element-hq synapse, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-45078 and fix it if it is affected.\n\nWhat it is: CVE-2026-45078 is a medium-severity denial of service vulnerability in element-hq synapse, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-45078 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- matrix-synapse (PyPI): affected all versions; fixed in 1.152.1\n- matrix-synapse (PyPI): affected all versions; fixed in 1.152.1\n- matrix-synapse (PyPI): affected all versions; fixed in 1.152.1\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-2026-45078/ (Markdown: https://insights.sbomify.com/CVE-2026-45078/index.md)","id":"CVE-2026-45078","markdown":"https://insights.sbomify.com/CVE-2026-45078/index.md","name":"CVE-2026-45078","record":{"aliases":["GHSA-8q93-326v-3m7g","PYSEC-2026-191","UBUNTU-CVE-2026-45078"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Matrix homeserver","requires_auth":"low_privilege","summary":"Authenticated users can cause CPU starvation in Synapse, denying service to other users; administrators should upgrade to the fixed version.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"synapse","vendor":"element"}],"cvss":{"score":6.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.","ecosystems":["PyPI"],"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":"Synapse CPU starvation (Denial of Service)","id":"CVE-2026-45078","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Klaw: Improper Access Control Allows Disclosure of Password Hash","id":"CVE-2026-45080"},"packages":[{"ecosystem":"PyPI","fixed":["1.152.1"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":null,"source":"GHSA-8q93-326v-3m7g"},{"ecosystem":"PyPI","fixed":["1.152.1"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"GHSA-8q93-326v-3m7g"},{"ecosystem":"PyPI","fixed":["1.152.1"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"PYSEC-2026-191"}],"prev":{"headline":"Symfony: Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener","id":"CVE-2026-45077"},"products":["synapse"],"published":"2026-05-28","related":[{"cvss_score":5.1,"headline":"Synapse pagination denial of service","id":"CVE-2026-45076","kev_date_added":null,"published":"2026-05-28"}],"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":"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":"2026-05-29","vendors":["element-hq"]},"summary":"Authenticated users can cause CPU starvation in Synapse, denying service to other users; administrators should upgrade to the fixed version.","url":"https://insights.sbomify.com/CVE-2026-45078/"}