{"answers":{"affected":"1 open source package ship an affected version, including devalue.","exploited":"There is no known exploitation of CVE-2026-123563 in the wild and no public exploit code.","exposure":"","fix":"Upgrade devalue to 5.9.3 or later.","what":"CVE-2026-123563 is a high-severity vulnerability in sveltejs devalue, published on 8 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-123563 and fix it if it is affected.\n\nWhat it is: CVE-2026-123563 is a high-severity vulnerability in sveltejs devalue, published on 8 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-123563 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- devalue (npm): affected all versions; fixed in 5.9.3\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-2026-123563/ (Markdown: https://insights.sbomify.com/CVE-2026-123563/index.md)","id":"CVE-2026-123563","markdown":"https://insights.sbomify.com/CVE-2026-123563/index.md","name":"CVE-2026-123563","record":{"aliases":["GHSA-6cvq-7mp2-2cxc","GHSA-r9w8-h9r3-54w4"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"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-789","name":"Memory Allocation with Excessive Size Value"}],"description":"Devalue before 5.9.3 contains a validation bypass vulnerability that allows custom ArrayBuffer revivers to skip typed-array allocation checks in the parse function. Attackers can supply very small crafted input processed by a malformed ArrayBuffer reviver to allocate massive ArrayBuffers, causing memory exhaustion and denial of service.","ecosystems":["npm"],"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":"Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse","id":"CVE-2026-123563","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":2,"next":{"headline":"Sveltejs devalue before 5.9.3 Memory Exhaustion via uneval Sparse Arrays","id":"CVE-2026-123564"},"nickname":null,"packages":[{"ecosystem":"npm","fixed":["5.9.3"],"introduced":["0"],"last_affected":[],"package":"devalue","purl":null,"source":"GHSA-r9w8-h9r3-54w4"}],"prev":{"headline":"Devalue 5.8.0 before 5.9.3 Denial of Service via stringifyAsync Unhandled Rejection","id":"CVE-2026-123562"},"products":["devalue"],"published":"2026-11-08","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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-08","vendors":["sveltejs"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-123563/"}