{"answers":{"affected":"2 open source packages ship an affected version, including oj.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54903 exists.","fix":"Upgrade oj to 3.17.3 or later.","what":"CVE-2026-54903 is a medium-severity vulnerability in ohler55 oj, published on 30 Jun 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-2026-54903 and fix it if it is affected.\n\nWhat it is: CVE-2026-54903 is a medium-severity vulnerability in ohler55 oj, published on 30 Jun 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-2026-54903 exists.\n\nAffected packages and fixed versions:\n- oj (RubyGems): affected all versions; fixed in 3.17.3\n- oj (RubyGems): affected all versions; fixed in 3.17.3\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-2026-54903/ (Markdown: https://insights.sbomify.com/CVE-2026-54903/index.md)","id":"CVE-2026-54903","markdown":"https://insights.sbomify.com/CVE-2026-54903/index.md","name":"CVE-2026-54903","record":{"aliases":["DEBIAN-CVE-2026-54903","GHSA-475m-ph3x-64gp","MINI-3r5f-hmpv-fv9p","MINI-3vmv-3pvq-r2xp","MINI-5w8g-63hf-r5c9","MINI-76xg-qm5p-56pr","MINI-cr25-8w79-c6vc","MINI-gp9p-3fg7-xjjq","MINI-j9w2-9mw4-3wm8","MINI-v8vw-gh98-mf53","MINI-vjw4-x43x-hg28","MINI-vxqx-96mm-3q3h","UBUNTU-CVE-2026-54903"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby JSON parser","requires_auth":"none","summary":"An integer overflow in the Oj Ruby gem allows attackers to cause heap corruption and potential code execution by parsing JSON strings larger than 2GB.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.","ecosystems":["RubyGems"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Oj: Integer Overflow in Oj.load 2GB String Handling","id":"CVE-2026-54903","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"concurrent-ruby: `AtomicReference#update` livelocks when the stored value is `Float::NAN`","id":"CVE-2026-54904"},"packages":[{"ecosystem":"RubyGems","fixed":["3.17.3"],"introduced":["0"],"last_affected":[],"package":"oj","purl":null,"source":"GHSA-475m-ph3x-64gp"},{"ecosystem":"RubyGems","fixed":["3.17.3"],"introduced":["0"],"last_affected":[],"package":"oj","purl":"pkg:gem/oj","source":"GHSA-475m-ph3x-64gp"}],"prev":{"headline":"Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback","id":"CVE-2026-54902"},"products":["oj"],"published":"2026-06-30","related":[],"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":"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":"2026-07-01","vendors":["ohler55"]},"summary":"An integer overflow in the Oj Ruby gem allows attackers to cause heap corruption and potential code execution by parsing JSON strings larger than 2GB.","url":"https://insights.sbomify.com/CVE-2026-54903/"}