{"answers":{"affected":"It affects 9 products.","exploited":"There is no known exploitation of CVE-2023-27537 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2023-27537 is a medium-severity use after free vulnerability in Haxx Libcurl, published on 30 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-27537 and fix it if it is affected.\n\nWhat it is: CVE-2023-27537 is a medium-severity use after free vulnerability in Haxx Libcurl, published on 30 Mar 2023. 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-2023-27537 in the wild and no public exploit code.\n\nAffected product: Haxx Libcurl. 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-2023-27537/ (Markdown: https://insights.sbomify.com/CVE-2023-27537/index.md)","id":"CVE-2023-27537","markdown":"https://insights.sbomify.com/CVE-2023-27537/index.md","name":"CVE-2023-27537","record":{"aliases":["ALPINE-CVE-2023-27537","AZL-25852","AZL-25858","AZL-34603","AZL-38114","CLEANSTART-2026-NT49097","CURL-CVE-2023-27537","DEBIAN-CVE-2023-27537","GHSA-9j2c-vm53-wcvm","JLSEC-2025-32"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"libcurl library","requires_auth":"none","summary":"A double free or use-after-free in libcurl's HSTS sharing allows attackers to cause crashes or execute code when multiple threads share data.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"hackerone","cpe":[{"product":"brocade_fabric_operating_system_firmware","vendor":"broadcom"},{"product":"libcurl","vendor":"haxx"},{"product":"active_iq_unified_manager","vendor":"netapp"},{"product":"clustered_data_ontap","vendor":"netapp"},{"product":"h300s_firmware","vendor":"netapp"},{"product":"h410s_firmware","vendor":"netapp"},{"product":"h500s_firmware","vendor":"netapp"},{"product":"h700s_firmware","vendor":"netapp"},{"product":"universal_forwarder","vendor":"splunk"}],"cvss":{"score":5.9,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-415","name":"Double Free"}],"description":"A double free vulnerability exists in libcurl \u003c8.0.0 when sharing HSTS data between separate \"handles\". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.","ecosystems":[],"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":"Use after free in https://github.com/curl/curl","id":"CVE-2023-27537","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"haxx:libcurl","products":["haxx:libcurl","netapp:active_iq_unified_manager","netapp:clustered_data_ontap","netapp:h300s_firmware","netapp:h410s_firmware","netapp:h500s_firmware","netapp:h700s_firmware","splunk:universal_forwarder"],"type":"use_after_free","year":"2023"},"n_packages":0,"n_references":3,"next":{"headline":"Auth bypass in https://github.com/curl/curl","id":"CVE-2023-27538"},"packages":[],"prev":{"headline":"Auth bypass in https://github.com/curl/curl","id":"CVE-2023-27536"},"products":["https://github.com/curl/curl"],"published":"2023-03-30","related":[{"cvss_score":8.8,"headline":"Path traversal in https://github.com/curl/curl","id":"CVE-2023-27534","kev_date_added":null,"published":"2023-03-30"},{"cvss_score":7.8,"headline":"Privilege escalation in kernel","id":"CVE-2021-4197","kev_date_added":null,"published":"2022-03-23"},{"cvss_score":7.7,"headline":"Auth bypass in https://github.com/curl/curl","id":"CVE-2023-27538","kev_date_added":null,"published":"2023-03-30"},{"cvss_score":7.5,"headline":"Integer overflow in n/a","id":"CVE-2021-27218","kev_date_added":null,"published":"2021-02-15"},{"cvss_score":7.5,"headline":"Integer overflow in n/a","id":"CVE-2021-27219","kev_date_added":null,"published":"2021-02-15"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2019-19044","kev_date_added":null,"published":"2019-11-18"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2019-19052","kev_date_added":null,"published":"2019-11-18"}],"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":"2026-10-14","vendors":["n/a"]},"summary":"A double free or use-after-free in libcurl's HSTS sharing allows attackers to cause crashes or execute code when multiple threads share data.","url":"https://insights.sbomify.com/CVE-2023-27537/"}