{"id":"CVE-2026-81726","aliases":["DEBIAN-CVE-2026-81726","EUVD-2026-67076","GHSA-8mgp-746c-j5xp","GHSA-hqj7-phwp-c3fp","PYSEC-2026-3740","UBUNTU-CVE-2026-81726","openSUSE-SU-2026:12280-1"],"status":"published","title":"NLTK through 3.10.3 Path Traversal via Model-Artifact APIs","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","severity":{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00339,"percentile":0.27751,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22","CWE-59","CWE-73"],"published":"2026-08-27T14:51:18Z","modified":"2026-11-02T22:15:04Z","fixes":[{"ecosystem":"PyPI","package":"nltk","fixed_in":["3.10.4","3.10.3"],"sources":["ghsa","osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-nltk","fixed_in":["3.10.4-1.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.10.3"},{"fixed":"3.10.4"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0-1","3.10.1-1","3.10.3-1","3.8-1","3.8.1-1","3.9.1-1","3.9.1-2","3.9.2-1","3.9.3-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0-1","3.10.1-1","3.10.3-1","3.9.1-2","3.9.2-1","3.9.3-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0-1","3.10.1-1","3.10.3-1","3.9.1-2","3.9.2-1","3.9.3-1"]},{"source":"osv","ecosystem":"PyPI","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.4"}]}],"versions":["0.8","0.9","0.9.3","0.9.4","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","2.0.1","2.0.1rc1","2.0.1rc2-git","2.0.1rc3","2.0.1rc4","2.0.2","2.0.3","2.0.4","2.0.5","2.0b4","2.0b5","2.0b6","2.0b7","2.0b8","2.0b9","3.0.0","3.0.0b1","3.0.0b2","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.1","3.10.0","3.10.1","3.10.2","3.10.3","3.2","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.3","3.4","3.4.1","3.4.2","3.4.3","3.4.4","3.4.5","3.5","3.5b1","3.6","3.6.1","3.6.2","3.6.3","3.6.4","3.6.5","3.6.6","3.6.7","3.7","3.8","3.8.1","3.9","3.9.1","3.9.2","3.9.3","3.9.4","3.9b1"]},{"source":"osv","ecosystem":"PyPI","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.3"}]}],"versions":["0.8","0.9","0.9.3","0.9.4","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9","2.0.1","2.0.1rc1","2.0.1rc2-git","2.0.1rc3","2.0.1rc4","2.0.2","2.0.3","2.0.4","2.0.5","2.0b4","2.0b5","2.0b6","2.0b7","2.0b8","2.0b9","3.0.0","3.0.0b1","3.0.0b2","3.0.1","3.0.2","3.0.3","3.0.4","3.0.5","3.1","3.10.0","3.10.1","3.10.2","3.2","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.3","3.4","3.4.1","3.4.2","3.4.3","3.4.4","3.4.5","3.5","3.5b1","3.6","3.6.1","3.6.2","3.6.3","3.6.4","3.6.5","3.6.6","3.6.7","3.7","3.8","3.8.1","3.9","3.9.1","3.9.2","3.9.3","3.9.4","3.9b1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0~b9-0ubuntu4","2.0~b9-0ubuntu4.1~esm2","2.0~b9-0ubuntu4.1~esm4","2.0~b9-0ubuntu4.1~esm5","2.0~b9-0ubuntu4.1~esm6"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.4-1","3.0.5-1","3.1-1","3.1-1ubuntu0.1","3.1-1ubuntu0.1+esm1","3.1-1ubuntu0.1+esm2","3.1-1ubuntu0.1+esm3","3.1-1ubuntu0.1+esm4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.4-1","3.2.5-1","3.2.5-1ubuntu0.1","3.2.5-1ubuntu0.1+esm1","3.2.5-1ubuntu0.1+esm2","3.2.5-1ubuntu0.1+esm3","3.2.5-1ubuntu0.1+esm4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.5-1","3.4.5-2","3.4.5-2ubuntu0.1~esm1","3.4.5-2ubuntu0.1~esm2","3.4.5-2ubuntu0.1~esm3","3.4.5-2ubuntu0.1~esm4"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5-1","3.6.5-1","3.6.7-1","3.7-1","3.7-1ubuntu0.1~esm1","3.7-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.1-1","3.8.1-1ubuntu0.1~esm1","3.8.1-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.2-1","3.9.3-1","3.10.0-1","3.10.1-1","3.10.3-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.1-2","3.9.1-2build1","3.9.2-1","3.9.2-1ubuntu0.1~esm1","3.9.2-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-nltk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.4-1.1"}]}]}],"products":[{"vendor":"nltk","product":"nltk"}],"references":[{"url":"https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp","tags":["vendor-advisory","exploit","Exploit","Vendor Advisory","advisory","web","evidence","report"]},{"url":"https://www.vulncheck.com/advisories/nltk-through-3.10.3-path-traversal-via-model-artifact-apis","tags":["third-party-advisory","Third Party Advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81726","tags":["advisory"]},{"url":"https://github.com/nltk/nltk/pull/3757","tags":["web"]},{"url":"https://github.com/nltk/nltk/pull/3759","tags":["web"]},{"url":"https://github.com/nltk/nltk/pull/3813","tags":["web"]},{"url":"https://github.com/nltk/nltk/commit/2a92b71827d754ae8920261e7ed0c4bb283ab2d7","tags":["web"]},{"url":"https://github.com/nltk/nltk/commit/a44a7af69bca87e92d9c4a701fcbbe4512e8d450","tags":["web"]},{"url":"https://github.com/nltk/nltk/commit/cbc98458b43de5f792f0382583c16df39e5c5117","tags":["web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3740.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-8mgp-746c-j5xp"},{"url":"https://github.com/advisories/GHSA-hqj7-phwp-c3fp"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81726.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-81726","tags":["advisory"]},{"url":"https://github.com/nltk/nltk","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-81726","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81726","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-81726","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-81726","title":"NLTK through 3.10.3 Path Traversal via Model-Artifact APIs","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T14:51:18.838Z","modified":"2026-10-30T10:43:25.836Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T13:36:18.075535Z"}],"euvd":[{"id":"EUVD-2026-67076","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T14:51:18Z","modified":"2026-10-30T10:43:25Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:59:13.084737Z"}],"ghsa":[{"id":"GHSA-8mgp-746c-j5xp","title":"NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots","description":"### Summary\n\nSeveral model-artifact APIs still treat caller-controlled model paths as ordinary filenames even when NLTK path security is enforced. The same outside-root paths are rejected by guarded helpers, but these public read and write flows still use raw file APIs.\n\n### Details\n\n- **Vulnerability type:** File sandbox bypass\n- **Affected component:** `TransitionParser.train`, `TransitionParser.parse`, `AveragedPerceptron.save`, `AveragedPerceptron.load`, `PerceptronTagger.save_to_json`, `save_maxent_params`\n- **Affected versions:** Published `3.9.4` and current source `v3.10.0-rc2` both reproduced.\n- **Patched versions:** Not yet patched\n- **Root cause:** Model import and export helpers use built-in `open()` on caller-controlled paths instead of pathsec-aware helpers.\n\n`TransitionParser.train()` writes outside allowed roots, `TransitionParser.parse()` reads outside allowed roots, `AveragedPerceptron` bypasses the sandbox in both directions, and adjacent read-side helpers in the same family already show the intended guarded behavior. I confirmed outside-root reads and writes while `pathsec.open()` or the guarded sibling helpers rejected the same paths.\n\n### PoC\n\n**Preconditions**\n- The application enables `pathsec` enforcement and lets untrusted workflows choose model import or export paths.\n\n**Steps**\n1. Enable `pathsec.ENFORCE=True` and restrict allowed roots to a dedicated sandbox directory.\n2. Use public model import or export APIs with paths that point outside that root.\n3. Observe the same paths are rejected by negative-control guarded helpers such as `pathsec.open()`, `PerceptronTagger.load_from_json()`, or `load_maxent_params()`.\n4. Observe the vulnerable APIs still read or write outside-root files successfully.\n\n**Minimal reproducible excerpt**\n\n```text\ntransition_train_exists True\ntransition_parse_loader_read_bytes 13\naveraged_load_keys ['bias']\nmaxent_save wrote ['alwayson.tab', 'labels.txt']\n```\n\n### Impact\n\nConsumers that rely on `pathsec` for local containment can be tricked into reading or overwriting files outside approved roots through normal model persistence and loading APIs.\n\n### Remediation\n\nRoute all model-path file access through `nltk.pathsec.open()` or existing pathsec-aware helpers, and add regression tests that pair each vulnerable API with a negative control on the same path.\n\n### References\n\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/parse/transitionparser.py#L551-L571\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/tag/perceptron.py#L106-L113\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/tag/perceptron.py#L262-L273\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/classify/maxent.py#L1583-L1602","status":"published","published":"2026-09-02T14:35:04Z","modified":"2026-11-02T22:06:21Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"}],"cwes":["CWE-22","CWE-59","CWE-73"],"updated_at":"2026-11-03T00:02:45.112873Z"},{"id":"GHSA-hqj7-phwp-c3fp","title":"Duplicate Advisory: Model-artifact APIs bypass pathsec and touch files outside allowed roots","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-8mgp-746c-j5xp. This link is maintained to preserve external references.\n\n## Original Description\nNLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"withdrawn","published":"2026-08-27T18:32:30Z","modified":"2026-09-02T14:34:27Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T14:41:10.121131Z"}],"nvd":[{"id":"CVE-2026-81726","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T17:21:03.387Z","modified":"2026-10-30T11:17:33.577Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T14:12:42.035353Z"}],"osv":[{"id":"CVE-2026-81726","title":"NLTK through 3.10.3 Path Traversal via Model-Artifact APIs","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T14:51:18.838Z","modified":"2026-11-01T02:30:17.619781473Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T15:45:18.131258Z"},{"id":"DEBIAN-CVE-2026-81726","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T17:21:03.387Z","modified":"2026-10-31T09:47:26.613409455Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:46:04.577397Z"},{"id":"GHSA-8mgp-746c-j5xp","title":"NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots","description":"### Summary\n\nSeveral model-artifact APIs still treat caller-controlled model paths as ordinary filenames even when NLTK path security is enforced. The same outside-root paths are rejected by guarded helpers, but these public read and write flows still use raw file APIs.\n\n### Details\n\n- **Vulnerability type:** File sandbox bypass\n- **Affected component:** `TransitionParser.train`, `TransitionParser.parse`, `AveragedPerceptron.save`, `AveragedPerceptron.load`, `PerceptronTagger.save_to_json`, `save_maxent_params`\n- **Affected versions:** Published `3.9.4` and current source `v3.10.0-rc2` both reproduced.\n- **Patched versions:** Not yet patched\n- **Root cause:** Model import and export helpers use built-in `open()` on caller-controlled paths instead of pathsec-aware helpers.\n\n`TransitionParser.train()` writes outside allowed roots, `TransitionParser.parse()` reads outside allowed roots, `AveragedPerceptron` bypasses the sandbox in both directions, and adjacent read-side helpers in the same family already show the intended guarded behavior. I confirmed outside-root reads and writes while `pathsec.open()` or the guarded sibling helpers rejected the same paths.\n\n### PoC\n\n**Preconditions**\n- The application enables `pathsec` enforcement and lets untrusted workflows choose model import or export paths.\n\n**Steps**\n1. Enable `pathsec.ENFORCE=True` and restrict allowed roots to a dedicated sandbox directory.\n2. Use public model import or export APIs with paths that point outside that root.\n3. Observe the same paths are rejected by negative-control guarded helpers such as `pathsec.open()`, `PerceptronTagger.load_from_json()`, or `load_maxent_params()`.\n4. Observe the vulnerable APIs still read or write outside-root files successfully.\n\n**Minimal reproducible excerpt**\n\n```text\ntransition_train_exists True\ntransition_parse_loader_read_bytes 13\naveraged_load_keys ['bias']\nmaxent_save wrote ['alwayson.tab', 'labels.txt']\n```\n\n### Impact\n\nConsumers that rely on `pathsec` for local containment can be tricked into reading or overwriting files outside approved roots through normal model persistence and loading APIs.\n\n### Remediation\n\nRoute all model-path file access through `nltk.pathsec.open()` or existing pathsec-aware helpers, and add regression tests that pair each vulnerable API with a negative control on the same path.\n\n### References\n\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/parse/transitionparser.py#L551-L571\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/tag/perceptron.py#L106-L113\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/tag/perceptron.py#L262-L273\n- https://github.com/nltk/nltk/blob/v3.10.0-rc2/nltk/classify/maxent.py#L1583-L1602","status":"published","published":"2026-09-02T14:35:04Z","modified":"2026-11-02T22:15:04.414504485Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"},{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22","CWE-59","CWE-73"],"updated_at":"2026-11-03T00:03:07.015763Z"},{"id":"GHSA-hqj7-phwp-c3fp","title":"Duplicate Advisory: Model-artifact APIs bypass pathsec and touch files outside allowed roots","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-8mgp-746c-j5xp. This link is maintained to preserve external references.\n\n## Original Description\nNLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"withdrawn","published":"2026-08-27T18:32:30Z","modified":"2026-09-02T14:45:05.967949645Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"},{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-73"],"updated_at":"2026-11-02T15:46:49.28217Z"},{"id":"PYSEC-2026-3740","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T17:21:03.387Z","modified":"2026-09-01T09:15:03.463659349Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:52:57.255153Z"},{"id":"UBUNTU-CVE-2026-81726","description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","status":"published","published":"2026-08-27T17:21:00Z","modified":"2026-10-17T13:01:10.533303364Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L","level":"high"},{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"},{"id":"openSUSE-SU-2026:12280-1","title":"python313-nltk-3.10.4-1.1 on GA media","description":"These are all security issues fixed in the python313-nltk-3.10.4-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-26T00:00:00Z","modified":"2026-10-27T17:23:18.512832836Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}