{"answers":{"affected":"5 open source packages ship an affected version, including matrix-synapse. It affects 2 products.","exploited":"There is no known exploitation of CVE-2018-16515 in the wild and no public exploit code.","fix":"Upgrade matrix-synapse to a fixed version for your release line: 0.33.2.1 or 0.33.3.1.","what":"CVE-2018-16515 is a high-severity vulnerability in Debian Debian Linux, published on 18 Sep 2018. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-16515 and fix it if it is affected.\n\nWhat it is: CVE-2018-16515 is a high-severity vulnerability in Debian Debian Linux, published on 18 Sep 2018. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2018-16515 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- matrix-synapse (PyPI): affected all versions; fixed in 0.33.2.1, 0.33.3.1\n- matrix-synapse (PyPI): affected all versions; fixed in 0.33.2.1\n- matrix-synapse (PyPI): affected all versions; fixed in 0.33.2.1\n- matrix-synapse (PyPI): affected from 0.33.3; fixed in 0.33.3.1\n- matrix-synapse (PyPI): affected from 0.33.3; fixed in 0.33.3.1\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-2018-16515/ (Markdown: https://insights.sbomify.com/CVE-2018-16515/index.md)","id":"CVE-2018-16515","markdown":"https://insights.sbomify.com/CVE-2018-16515/index.md","name":"CVE-2018-16515","record":{"aliases":["GHSA-fmvh-rvq5-hhjx","PYSEC-2026-845","UBUNTU-CVE-2018-16515"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Matrix Synapse server","requires_auth":"low_privilege","summary":"Remote attackers can spoof events due to improper signature validation, compromising data integrity in Matrix Synapse deployments.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"synapse","vendor":"matrix"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.","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":"Matrix Synapse Improper Signature Validation","id":"CVE-2018-16515","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"debian:debian_linux","products":["debian:debian_linux"],"type":"security_feature_bypass","year":"2018"},"n_packages":5,"n_references":3,"next":{"headline":"Flask-Admin Cross-site Scripting vulnerability","id":"CVE-2018-16516"},"packages":[{"ecosystem":"PyPI","fixed":["0.33.2.1","0.33.3.1"],"introduced":["0","0.33.3"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"PYSEC-2026-845"},{"ecosystem":"PyPI","fixed":["0.33.2.1"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":null,"source":"GHSA-fmvh-rvq5-hhjx"},{"ecosystem":"PyPI","fixed":["0.33.2.1"],"introduced":["0"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"GHSA-fmvh-rvq5-hhjx"},{"ecosystem":"PyPI","fixed":["0.33.3.1"],"introduced":["0.33.3"],"last_affected":[],"package":"matrix-synapse","purl":null,"source":"GHSA-fmvh-rvq5-hhjx"},{"ecosystem":"PyPI","fixed":["0.33.3.1"],"introduced":["0.33.3"],"last_affected":[],"package":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","source":"GHSA-fmvh-rvq5-hhjx"}],"prev":{"headline":"MantisBT cross-site scripting (XSS) vulnerability through crafted PATH_INFO","id":"CVE-2018-16514"},"products":["n/a"],"published":"2018-09-18","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-05","vendors":["n/a"]},"summary":"Remote attackers can spoof events due to improper signature validation, compromising data integrity in Matrix Synapse deployments.","url":"https://insights.sbomify.com/CVE-2018-16515/"}