{"items":[{"id":"NVI-00010641","kind":"vulnerability","title":"nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pjvx-prjx-h659","CVE-2026-114140"],"plain_summary":"GitHub lists this reviewed advisory for nbconvert. 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-23f327702c5df57702450636d8f6bf2e"],"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":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.455%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.39496. Missing scores are unknown.","source_id":"sr-23f327702c5df57702450636d8f6bf2e"}],"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-7ec505ae5540473486c995bd41718268","url":"https://github.com/advisories/GHSA-pjvx-prjx-h659","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pjvx-prjx-h659","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:30.906Z"},{"id":"sr-23f327702c5df57702450636d8f6bf2e","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-114140","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.776Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7ec505ae5540473486c995bd41718268"],"technology":"nbconvert","known_exclusions":[],"conditions_summary":"### Summary\n\nnbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute.\n\nVulnerable converters : `--to markdown`, `--to latex`, `--to rst`, `--to asciidoc`.\n\nIn `ExtractOutputPreprocessor`, `extractoutput.py:116-119` joins attacker-controlled  `path` to `output_files_dir` with no canonicalization check, enabling arbitrary file write.\n\nThis is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg.\n\n### Impact\n\nIf a victim runs nbconvert on a malicious ipynb file, it can create some files with arbitrary data in arbitrary locations, i.e. override authorized_keys.\n\nNote that running the cell with jupyter overrides the output, so it would \"clean up\" malicious cells.\n\n### PoC\n\nIn a ipynb file:\n\n```json\n\n\"cells\": [{\n        \"cell_type\": \"code\", \"id\": \"abc123\", \"execution_count\": 1,\n        \"metadata\": {}, \"source\": \"# PoC\",\n        \"outputs\": [{\n            \"output_type\": \"display_data\",\n            \"metadata\": {\n                \"filename\": \"../../../tmp/PWNED.png\"  # ← traverses outside output_dir\n            },\n            \"data\": {\n                # minimal val","public_affected_ranges":[">= 5.4.0, <= 7.17.1"]}],"null_published_at":"2026-11-08T19:53:33.527Z","source_updated_at":"2026-10-22T16:23:29.000Z","source_disclosed_at":"2026-10-22T16:23:28.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T22:07:30.906Z"},{"id":"NVI-00010641","kind":"vulnerability","title":"nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pjvx-prjx-h659","CVE-2026-114140"],"plain_summary":"GitHub lists this reviewed advisory for nbconvert. 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-a216c26104e12016f5a1e3771d93041a"],"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":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.455%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.39469. Missing scores are unknown.","source_id":"sr-a216c26104e12016f5a1e3771d93041a"}],"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-7ec505ae5540473486c995bd41718268","url":"https://github.com/advisories/GHSA-pjvx-prjx-h659","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pjvx-prjx-h659","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:30.906Z"},{"id":"sr-a216c26104e12016f5a1e3771d93041a","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-114140","publisher":"FIRST EPSS","observed_at":"2026-10-31T23:13:27.688Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7ec505ae5540473486c995bd41718268"],"technology":"nbconvert","known_exclusions":[],"conditions_summary":"### Summary\n\nnbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute.\n\nVulnerable converters : `--to markdown`, `--to latex`, `--to rst`, `--to asciidoc`.\n\nIn `ExtractOutputPreprocessor`, `extractoutput.py:116-119` joins attacker-controlled  `path` to `output_files_dir` with no canonicalization check, enabling arbitrary file write.\n\nThis is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg.\n\n### Impact\n\nIf a victim runs nbconvert on a malicious ipynb file, it can create some files with arbitrary data in arbitrary locations, i.e. override authorized_keys.\n\nNote that running the cell with jupyter overrides the output, so it would \"clean up\" malicious cells.\n\n### PoC\n\nIn a ipynb file:\n\n```json\n\n\"cells\": [{\n        \"cell_type\": \"code\", \"id\": \"abc123\", \"execution_count\": 1,\n        \"metadata\": {}, \"source\": \"# PoC\",\n        \"outputs\": [{\n            \"output_type\": \"display_data\",\n            \"metadata\": {\n                \"filename\": \"../../../tmp/PWNED.png\"  # ← traverses outside output_dir\n            },\n            \"data\": {\n                # minimal val","public_affected_ranges":[">= 5.4.0, <= 7.17.1"]}],"null_published_at":"2026-11-07T00:57:04.319Z","source_updated_at":"2026-10-22T16:23:29.000Z","source_disclosed_at":"2026-10-22T16:23:28.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T22:07:30.906Z"},{"id":"NVI-00010641","kind":"vulnerability","title":"nbconvert: Arbitrary file write through path traversal in cell output filenames when exporting to md, latex, rst and asciidoc","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pjvx-prjx-h659","CVE-2026-114140"],"plain_summary":"GitHub lists this reviewed advisory for nbconvert. 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-7ec505ae5540473486c995bd41718268"],"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":[],"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-7ec505ae5540473486c995bd41718268","url":"https://github.com/advisories/GHSA-pjvx-prjx-h659","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pjvx-prjx-h659","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T22:07:30.906Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-7ec505ae5540473486c995bd41718268"],"technology":"nbconvert","known_exclusions":[],"conditions_summary":"### Summary\n\nnbconvert <= v7.17.1 has an arbitrary file write vulnerability due to a path traversal in ipynb cell output metadata, more specifically on the filename attribute.\n\nVulnerable converters : `--to markdown`, `--to latex`, `--to rst`, `--to asciidoc`.\n\nIn `ExtractOutputPreprocessor`, `extractoutput.py:116-119` joins attacker-controlled  `path` to `output_files_dir` with no canonicalization check, enabling arbitrary file write.\n\nThis is a sibling vulnerability of https://github.com/advisories/GHSA-4c99-qj7h-p3vg.\n\n### Impact\n\nIf a victim runs nbconvert on a malicious ipynb file, it can create some files with arbitrary data in arbitrary locations, i.e. override authorized_keys.\n\nNote that running the cell with jupyter overrides the output, so it would \"clean up\" malicious cells.\n\n### PoC\n\nIn a ipynb file:\n\n```json\n\n\"cells\": [{\n        \"cell_type\": \"code\", \"id\": \"abc123\", \"execution_count\": 1,\n        \"metadata\": {}, \"source\": \"# PoC\",\n        \"outputs\": [{\n            \"output_type\": \"display_data\",\n            \"metadata\": {\n                \"filename\": \"../../../tmp/PWNED.png\"  # ← traverses outside output_dir\n            },\n            \"data\": {\n                # minimal val","public_affected_ranges":[">= 5.4.0, <= 7.17.1"]}],"null_published_at":"2026-10-31T22:27:09.626Z","source_updated_at":"2026-10-22T16:23:29.000Z","source_disclosed_at":"2026-10-22T16:23:28.000Z","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":"2026-10-31T22:07:30.906Z"}],"next_cursor":null,"snapshot_revision":"42594"}