{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100242 exists.","fix":"No fix has been published for CVE-2026-100242 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-100242 is a high-severity denial of service vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension, published on 29 Sep 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-2026-100242 and fix it if it is affected.\n\nWhat it is: CVE-2026-100242 is a high-severity denial of service vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension, published on 29 Sep 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-2026-100242 exists.\n\nAffected product: Wikimedia Foundation Mediawiki - DataTransfer Extension. 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-2026-100242/ (Markdown: https://insights.sbomify.com/CVE-2026-100242/index.md)","id":"CVE-2026-100242","markdown":"https://insights.sbomify.com/CVE-2026-100242/index.md","name":"CVE-2026-100242","record":{"aliases":["GHSA-pc77-95w9-j7gj"],"analysis":{"component_type":"cms_plugin","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"MediaWiki DataTransfer extension","requires_auth":"none","summary":"Attackers can cause denial of service via excessive memory allocation in the DataTransfer extension due to a vulnerable dependency.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"wikimedia-foundation","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-1395","name":"Dependency on Vulnerable Third-Party Component"}],"description":"Dependency on Vulnerable Third-Party Component and Uncontrolled Resource Consumption vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension allows Excessive Allocation.\n\nThis issue affects Mediawiki - DataTransfer Extension: from 1.46.0 before 1.47.0.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion)","id":"CVE-2026-100242","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Stored XSS in WikiSEO author and image properties on action=info","id":"CVE-2026-100243"},"packages":[],"prev":{"headline":"Private change tags exposed to anonymous users via revision-tags-change events","id":"CVE-2026-100241"},"products":["Mediawiki - DataTransfer Extension"],"published":"2026-09-29","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-10-01","vendors":["Wikimedia Foundation"]},"summary":"Attackers can cause denial of service via excessive memory allocation in the DataTransfer extension due to a vulnerable dependency.","url":"https://insights.sbomify.com/CVE-2026-100242/"}