CVE-2026-66881 (GCVE-0-2026-66881)
Vulnerability from cvelistv5 – Published: 2026-08-05 19:43 – Updated: 2026-08-06 13:03
VLAI
EPSS
VEX
Title
Path traversal in imported file_entries name allows arbitrary file write via URL-type entry download
Summary
Relative Path Traversal vulnerability in livebook-dev livebook allows an attacker-authored notebook to write a file with attacker-controlled content to an arbitrary path.
A .livemd notebook can declare file_entries metadata, each entry carrying a name. Every path that creates a file entry through the user interface validates that name with Livebook.Notebook.validate_file_entry_name/2, which requires a flat filename of alphanumerics, dashes, underscores and dots, ending in an extension. The import path does not: Livebook.LiveMarkdown.Import.file_entry_metadata_to_attrs/1 in lib/livebook/live_markdown/import.ex takes the name verbatim from the notebook source.
For a URL-type file entry, Livebook.Session.file_entry_cache_file/2 in lib/livebook/session.ex resolves that name beneath the session's temporary directory without checking that the result stays inside it, and Livebook.FileSystem.Utils.resolve_unix_like_path/2 collapses parent-directory segments while clamping only at the filesystem root. When the entry's content is requested and no cached copy exists, Livebook fetches the entry's URL and writes the response body to the resolved path, creating parent directories as needed. The attacker therefore controls both the destination and the contents of the written file, which may land anywhere the Livebook process can write. The same missing containment check is present in Livebook.Session.to_attachment_file_entry/2.
A victim who opens an attacker-supplied notebook and causes the entry to be fetched triggers the write within their own authenticated session; the attacker needs no account on the target instance. URL-type entries are also not placed under notebook stamping quarantine on import, so no warning is shown.
This issue affects livebook: from 0.11.0 before 0.18.7 and from 0.19.0 before 0.19.9.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 13:03 UTC
CWE
- CWE-23 - Relative Path Traversal
Assigner
References
6 references
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| livebook-dev | livebook |
Affected:
0.11.0 , < 0.18.7
(semver)
Affected: 0.19.0 , < 0.19.9 (semver) cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
|
| livebook-dev | livebook |
Affected:
0.11.0 , < 0.18.7
(other)
Affected: 0.19.0 , < 0.19.9 (other) Affected: 0.11.0-cuda12 , < 0.18.7-cuda12 (other) Affected: 0.19.0-cuda12 , < 0.19.9-cuda12 (other) cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
|
| livebook-dev | livebook |
Affected:
c02eb984f80a543c7a52b1d882c76f56aa5be743 , < *
(git)
cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:* |
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"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"Path traversal in imported file_entries name allows arbitrary file write via URL-type entry download\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Nguy\\u1ec5n C\\u00f4ng T\\u00fa\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Jonatan K\\u0142osko\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"Jos\\u00e9 Valim\"}], \"impacts\": [{\"capecId\": \"CAPEC-76\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-76 Manipulating Web Input to File System Calls\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", 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\"pkg:github/livebook-dev/livebook\", \"packageName\": \"livebook-dev/livebook\", \"programFiles\": [\"lib/livebook/live_markdown/import.ex\", \"lib/livebook/session.ex\", \"lib/livebook/file_system/utils.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Livebook.LiveMarkdown.Import\u0027:file_entry_metadata_to_attrs/1\"}, {\"name\": \"\u0027Elixir.Livebook.Session\u0027:file_entry_cache_file/2\"}, {\"name\": \"\u0027Elixir.Livebook.Session\u0027:to_attachment_file_entry/2\"}, {\"name\": \"\u0027Elixir.Livebook.FileSystem.Utils\u0027:resolve_unix_like_path/2\"}]}], \"references\": [{\"url\": \"https://github.com/livebook-dev/livebook/security/advisories/GHSA-r4h8-2xpq-v48g\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-66881.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-66881\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/livebook-dev/livebook/commit/1443dd23df6e7b9203b6797f0695a807aeb81dde\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/livebook-dev/livebook/commit/acf4cb8c0c79b89c795b180f061be7de2d8b5aa9\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/livebook-dev/livebook/commit/50f86982ebf36c22abeb379b55ec0f2859c83bb9\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Relative Path Traversal vulnerability in livebook-dev livebook allows an attacker-authored notebook to write a file with attacker-controlled content to an arbitrary path.\\n\\nA .livemd notebook can declare file_entries metadata, each entry carrying a name. Every path that creates a file entry through the user interface validates that name with Livebook.Notebook.validate_file_entry_name/2, which requires a flat filename of alphanumerics, dashes, underscores and dots, ending in an extension. The import path does not: Livebook.LiveMarkdown.Import.file_entry_metadata_to_attrs/1 in lib/livebook/live_markdown/import.ex takes the name verbatim from the notebook source.\\n\\nFor a URL-type file entry, Livebook.Session.file_entry_cache_file/2 in lib/livebook/session.ex resolves that name beneath the session\u0027s temporary directory without checking that the result stays inside it, and Livebook.FileSystem.Utils.resolve_unix_like_path/2 collapses parent-directory segments while clamping only at the filesystem root. When the entry\u0027s content is requested and no cached copy exists, Livebook fetches the entry\u0027s URL and writes the response body to the resolved path, creating parent directories as needed. The attacker therefore controls both the destination and the contents of the written file, which may land anywhere the Livebook process can write. The same missing containment check is present in Livebook.Session.to_attachment_file_entry/2.\\n\\nA victim who opens an attacker-supplied notebook and causes the entry to be fetched triggers the write within their own authenticated session; the attacker needs no account on the target instance. URL-type entries are also not placed under notebook stamping quarantine on import, so no warning is shown.\\n\\nThis issue affects livebook: from 0.11.0 before 0.18.7 and from 0.19.0 before 0.19.9.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eRelative Path Traversal vulnerability in livebook-dev livebook allows an attacker-authored notebook to write a file with attacker-controlled content to an arbitrary path.\u003c/p\u003e\\n\u003cp\u003eA \u003ccode\u003e.livemd\u003c/code\u003e notebook can declare \u003ccode\u003efile_entries\u003c/code\u003e metadata, each entry carrying a \u003ccode\u003ename\u003c/code\u003e. Every path that creates a file entry through the user interface validates that name with \u003ccode\u003eLivebook.Notebook.validate_file_entry_name/2\u003c/code\u003e, which requires a flat filename of alphanumerics, dashes, underscores and dots, ending in an extension. The import path does not: \u003ccode\u003eLivebook.LiveMarkdown.Import.file_entry_metadata_to_attrs/1\u003c/code\u003e in \u003ccode\u003elib/livebook/live_markdown/import.ex\u003c/code\u003e takes the name verbatim from the notebook source.\u003c/p\u003e\\n\u003cp\u003eFor a URL-type file entry, \u003ccode\u003eLivebook.Session.file_entry_cache_file/2\u003c/code\u003e in \u003ccode\u003elib/livebook/session.ex\u003c/code\u003e resolves that name beneath the session\u0027s temporary directory without checking that the result stays inside it, and \u003ccode\u003eLivebook.FileSystem.Utils.resolve_unix_like_path/2\u003c/code\u003e collapses parent-directory segments while clamping only at the filesystem root. When the entry\u0027s content is requested and no cached copy exists, Livebook fetches the entry\u0027s URL and writes the response body to the resolved path, creating parent directories as needed. The attacker therefore controls both the destination and the contents of the written file, which may land anywhere the Livebook process can write. The same missing containment check is present in \u003ccode\u003eLivebook.Session.to_attachment_file_entry/2\u003c/code\u003e.\u003c/p\u003e\\n\u003cp\u003eA victim who opens an attacker-supplied notebook and causes the entry to be fetched triggers the write within their own authenticated session; the attacker needs no account on the target instance. URL-type entries are also not placed under notebook stamping quarantine on import, so no warning is shown.\u003c/p\u003e\\n\u003cp\u003eThis issue affects livebook: from 0.11.0 before 0.18.7 and from 0.19.0 before 0.19.9.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"Relative Path Traversal vulnerability in livebook-dev livebook allows an attacker-authored notebook to write a file with attacker-controlled content to an arbitrary path.\\n\\nA `.livemd` notebook can declare `file_entries` metadata, each entry carrying a `name`. Every path that creates a file entry through the user interface validates that name with `Livebook.Notebook.validate_file_entry_name/2`, which requires a flat filename of alphanumerics, dashes, underscores and dots, ending in an extension. 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The same missing containment check is present in `Livebook.Session.to_attachment_file_entry/2`.\\n\\nA victim who opens an attacker-supplied notebook and causes the entry to be fetched triggers the write within their own authenticated session; the attacker needs no account on the target instance. URL-type entries are also not placed under notebook stamping quarantine on import, so no warning is shown.\\n\\nThis issue affects livebook: from 0.11.0 before 0.18.7 and from 0.19.0 before 0.19.9.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-23\", \"description\": \"CWE-23 Relative Path Traversal\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.18.7\", \"versionStartIncluding\": \"0.11.0\"}, {\"criteria\": \"cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.19.9\", \"versionStartIncluding\": \"0.19.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-05T19:43:48.812Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-66881\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-06T13:03:23.099180Z\"}}}], \"references\": [{\"url\": \"https://github.com/livebook-dev/livebook/security/advisories/GHSA-r4h8-2xpq-v48g\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-08-06T13:03:42.653Z\"}}]}",
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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