{"items":[{"id":"NVI-00013165","kind":"vulnerability","title":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyterlab.json)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-3jqq-pw4j-pqcj","CVE-2026-102830"],"plain_summary":"GitHub lists this reviewed advisory for jupyterlab, jupyterlab, jupyterlite-core. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-7eb97ed684a2cee2aa93515b6a5c78b0"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-01T15:22:18.000Z","value":"6.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-7eb97ed684a2cee2aa93515b6a5c78b0"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-7eb97ed684a2cee2aa93515b6a5c78b0","url":"https://github.com/advisories/GHSA-3jqq-pw4j-pqcj","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-3jqq-pw4j-pqcj","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:22:52.960Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7eb97ed684a2cee2aa93515b6a5c78b0"],"technology":"jupyterlab","known_exclusions":[],"conditions_summary":"## Description\n\nA language pack ships a `Plural-Forms` header saying how the language counts, for example `nplurals=2; plural=(n != 1);`. JupyterLab turns that string into a function with `new Function`, so the header gets executed. The check that meant to keep it safe was a regular expression. The regex was anchored at the start but not at the end, so it accepted any string that began with a valid plural rule and ignored everything after it.\n\nA header such as the following passed the check, and the part after the plural rule ran in the JupyterLab page as soon as the first plural string was translated:\n\n```\nnplurals=2; plural=(n > 1); \n```\n\nUsers are affected if all of the following are true:\n\n- they run JupyterLab 3.0.0 through 4.6.3, or an application that bundles it such as Notebook 7;\n- a language pack they did not write is installed in the environment; and\n- that language is selected, so its catalogue is loaded\n\nAn installation using the default English locale loads no catalogue and is not affected.\n\n> CVE assignment pending, GitHub CNA is experiencing severe backlog\n\n### Impact\n\nThe code in the header ran in the JupyterLab page, in the same or","public_affected_ranges":[">= 4.6.0, <= 4.6.3"]},{"certainty":"source_listed","source_ids":["sr-7eb97ed684a2cee2aa93515b6a5c78b0"],"technology":"jupyterlab","known_exclusions":[],"conditions_summary":"## Description\n\nA language pack ships a `Plural-Forms` header saying how the language counts, for example `nplurals=2; plural=(n != 1);`. JupyterLab turns that string into a function with `new Function`, so the header gets executed. The check that meant to keep it safe was a regular expression. The regex was anchored at the start but not at the end, so it accepted any string that began with a valid plural rule and ignored everything after it.\n\nA header such as the following passed the check, and the part after the plural rule ran in the JupyterLab page as soon as the first plural string was translated:\n\n```\nnplurals=2; plural=(n > 1); \n```\n\nUsers are affected if all of the following are true:\n\n- they run JupyterLab 3.0.0 through 4.6.3, or an application that bundles it such as Notebook 7;\n- a language pack they did not write is installed in the environment; and\n- that language is selected, so its catalogue is loaded\n\nAn installation using the default English locale loads no catalogue and is not affected.\n\n> CVE assignment pending, GitHub CNA is experiencing severe backlog\n\n### Impact\n\nThe code in the header ran in the JupyterLab page, in the same or","public_affected_ranges":[">= 3.0.0, <= 4.5.10"]},{"certainty":"source_listed","source_ids":["sr-7eb97ed684a2cee2aa93515b6a5c78b0"],"technology":"jupyterlite-core","known_exclusions":[],"conditions_summary":"## Description\n\nA language pack ships a `Plural-Forms` header saying how the language counts, for example `nplurals=2; plural=(n != 1);`. JupyterLab turns that string into a function with `new Function`, so the header gets executed. The check that meant to keep it safe was a regular expression. The regex was anchored at the start but not at the end, so it accepted any string that began with a valid plural rule and ignored everything after it.\n\nA header such as the following passed the check, and the part after the plural rule ran in the JupyterLab page as soon as the first plural string was translated:\n\n```\nnplurals=2; plural=(n > 1); \n```\n\nUsers are affected if all of the following are true:\n\n- they run JupyterLab 3.0.0 through 4.6.3, or an application that bundles it such as Notebook 7;\n- a language pack they did not write is installed in the environment; and\n- that language is selected, so its catalogue is loaded\n\nAn installation using the default English locale loads no catalogue and is not affected.\n\n> CVE assignment pending, GitHub CNA is experiencing severe backlog\n\n### Impact\n\nThe code in the header ran in the JupyterLab page, in the same or","public_affected_ranges":["<= 0.8.3"]}],"null_published_at":"2026-11-01T07:29:12.927Z","source_updated_at":"2026-10-01T15:22:18.000Z","source_disclosed_at":"2026-10-01T15:22:17.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T07:22:52.960Z"}],"next_cursor":null,"snapshot_revision":"42594"}