{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2019-11940 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2019-11940 yet. Limit exposure of the affected software until one is available.","what":"CVE-2019-11940 is a critical use after free vulnerability in Facebook Proxygen, published on 4 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2019-11940 and fix it if it is affected.\n\nWhat it is: CVE-2019-11940 is a critical use after free vulnerability in Facebook Proxygen, published on 4 Dec 2019. 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-2019-11940 in the wild and no public exploit code.\n\nAffected product: Facebook Proxygen. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2019-11940/ (Markdown: https://insights.sbomify.com/CVE-2019-11940/index.md)","id":"CVE-2019-11940","markdown":"https://insights.sbomify.com/CVE-2019-11940/index.md","name":"CVE-2019-11940","record":{"aliases":["GHSA-qp47-5phq-m7xm"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"HTTP2 library","requires_auth":"none","summary":"A use-after-free vulnerability in Proxygen's HPACK decompression allows attackers to cause undefined behavior, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"facebook","cpe":[{"product":"proxygen","vendor":"facebook"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Use after free in Proxygen","id":"CVE-2019-11940","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2019"},"n_packages":0,"n_references":2,"next":{"headline":"Code injection in HPE Intelligent Management Center (IMC) PLAT","id":"CVE-2019-11941"},"packages":[],"prev":{"headline":"Golang Facebook Thrift servers vulnerable to denial of service","id":"CVE-2019-11939"},"products":["Proxygen"],"published":"2019-12-04","related":[{"cvss_score":9.8,"headline":"Use after free in proxygen","id":"CVE-2020-1897","kev_date_added":null,"published":"2020-05-18"},{"cvss_score":9.8,"headline":"Memory corruption in Proxygen","id":"CVE-2019-11921","kev_date_added":null,"published":"2019-07-25"},{"cvss_score":7.5,"headline":"Proxygen fails to validate that a secondary auth manager is set before dereferencing it.","id":"CVE-2018-6343","kev_date_added":null,"published":"2018-12-31"},{"cvss_score":5.3,"headline":"Denial of service in proxygen","id":"CVE-2025-55181","kev_date_added":null,"published":"2025-12-02"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2024-08-04","vendors":["Facebook"]},"summary":"A use-after-free vulnerability in Proxygen's HPACK decompression allows attackers to cause undefined behavior, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2019-11940/"}