{"answers":{"affected":"3 open source packages ship an affected version, including ujson. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44660 exists.","fix":"Upgrade ujson to 5.12.1 or later.","what":"CVE-2026-44660 is a high-severity denial of service vulnerability in ultrajson, published on 27 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-44660 and fix it if it is affected.\n\nWhat it is: CVE-2026-44660 is a high-severity denial of service vulnerability in ultrajson, published on 27 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44660 exists.\n\nAffected packages and fixed versions:\n- ujson (PyPI): affected all versions; fixed in 5.12.1\n- ujson (PyPI): affected all versions; fixed in 5.12.1\n- ujson (PyPI): affected all versions; fixed in 5.12.1\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-2026-44660/ (Markdown: https://insights.sbomify.com/CVE-2026-44660/index.md)","id":"CVE-2026-44660","markdown":"https://insights.sbomify.com/CVE-2026-44660/index.md","name":"CVE-2026-44660","record":{"aliases":["DEBIAN-CVE-2026-44660","ECHO-25c2-dc78-3aeb","GHSA-c38f-wx89-p2xg","MINI-m8jh-xqv7-hq36","PYSEC-2026-2293","SUSE-SU-2026:23114-1","SUSE-SU-2026:23136-1","SUSE-SU-2026:3539-1","UBUNTU-CVE-2026-44660","openSUSE-SU-2026:21518-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python JSON library","requires_auth":"none","summary":"An attacker can cause memory exhaustion and denial of service by triggering write failures in ujson.dump(), affecting applications using the UltraJSON library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"ultrajson","vendor":"ultrajson_project"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.12.1, when ujson.dump() writes to a file-like object and the write operation raises an exception, the serialized JSON string object is not decremented, leaking memory. Each failed write operation leaks the full size of the serialized payload. This vulnerability is fixed in 5.12.1.","ecosystems":["PyPI","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 Development Tools 15 SP7","SUSE:Linux Enterprise Module for Package Hub 15 SP7","SUSE:Linux Enterprise Server 15 SP4-LTSS","SUSE:Linux Enterprise Server 15 SP5-LTSS","SUSE:Linux Enterprise Server 15 SP6-LTSS","SUSE:Linux Enterprise Server 16.0","SUSE:Linux Enterprise Server for SAP Applications 15 SP4","SUSE:Linux Enterprise Server for SAP Applications 15 SP5","SUSE:Linux Enterprise Server for SAP Applications 15 SP6","SUSE:Linux Enterprise Server for SAP applications 16.0","openSUSE:Leap 16.0"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"UltraJSON: Memory Leak in ujson.dump() on Write Failure","id":"CVE-2026-44660","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":20,"n_references":3,"next":{"headline":"python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol","id":"CVE-2026-44661"},"packages":[{"ecosystem":"PyPI","fixed":["5.12.1"],"introduced":["0"],"last_affected":[],"package":"ujson","purl":null,"source":"GHSA-c38f-wx89-p2xg"},{"ecosystem":"PyPI","fixed":["5.12.1"],"introduced":["0"],"last_affected":[],"package":"ujson","purl":"pkg:pypi/ujson","source":"GHSA-c38f-wx89-p2xg"},{"ecosystem":"PyPI","fixed":["5.12.1"],"introduced":["0"],"last_affected":[],"package":"ujson","purl":"pkg:pypi/ujson","source":"PYSEC-2026-2293"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Development Tools 15 SP7","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Package Hub 15 SP7","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP6-LTSS","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server 16.0","fixed":["5.10.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%2016.0","source":"SUSE-SU-2026:23114-1"},{"ecosystem":"SUSE:Linux Enterprise Server 16.0","fixed":["5.10.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%2016.0","source":"SUSE-SU-2026:23136-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","fixed":["1.35-150100.3.13.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP6","source":"SUSE-SU-2026:3539-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","fixed":["5.10.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0","source":"SUSE-SU-2026:23114-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","fixed":["5.10.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/suse/python-ujson\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0","source":"SUSE-SU-2026:23136-1"},{"ecosystem":"openSUSE:Leap 16.0","fixed":["5.10.0-160000.3.1"],"introduced":["0"],"last_affected":[],"package":"python-ujson","purl":"pkg:rpm/opensuse/python-ujson\u0026distro=openSUSE%20Leap%2016.0","source":"openSUSE-SU-2026:21518-1"}],"prev":{"headline":"Zen Browser Mac - Address Bar Spoofing via Long Subdomain","id":"CVE-2026-44659"},"products":["ultrajson"],"published":"2026-05-27","related":[{"cvss_score":7.5,"headline":"UltraJSON has a Memory Leak parsing large integers allows DoS","id":"CVE-2026-32874","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":7.5,"headline":"UltraJSON has an integer overflow handling large indent leads to buffer overflow or infinite loop","id":"CVE-2026-32875","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":6.5,"headline":"UltraJSON: Malformed/Truncated UTF-8 Accepted and Silently Rewritten in ujson.dumps()","id":"CVE-2026-54911","kev_date_added":null,"published":"2026-06-22"}],"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":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-30","vendors":["ultrajson"]},"summary":"An attacker can cause memory exhaustion and denial of service by triggering write failures in ujson.dump(), affecting applications using the UltraJSON library.","url":"https://insights.sbomify.com/CVE-2026-44660/"}