CVE Explorer
CVE-2026-39987
marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSocket endpoints (e.g., /ws) that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running mode and platform support before accepting connections, completely skipp
Known exploited
CISA KEV
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"marimo","vendor":"marimo-team","versions":[{"status":"affected","version":"< 0.23.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/problemTypes/0/descriptions/0
Known exploitation assertions
2 source assertions{"cwes":["CWE-306"],"dateAdded":"2026-04-23","dueDate":"2026-05-07","knownRansomwareCampaignUse":"Unknown","notes":"https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc ; https://nvd.nist.gov/vuln/detail/CVE-2026-39987","product":"Marimo","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and …
- cisa_kev_jsonknown_exploitedurn:baitaphish:normalized-source-record:v2:174be3e7bcf5f8cc74b045f1be5ec5b4fcdf45ac65de899c2bd91d8a1109089c · sha256:16acee8334e59e44… · /vulnerabilities/78Open source location →
{"cwes":["CWE-306"],"dateAdded":"2026-04-23","dueDate":"2026-05-07","knownRansomwareCampaignUse":"Unknown","notes":"https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc ; https://nvd.nist.gov/vuln/detail/CVE-2026-39987","product":"Marimo","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and …
- cisa_kev_jsonknown_exploitedurn:baitaphish:normalized-source-record:v2:0a3d76445dbbe90b32c820ded188684b1586912ee638df7055a6b465325cb9cd · sha256:635dff916c4092c0… · /vulnerabilities/81Open source location →
Source references
5 source assertions{"name":"https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a","tags":["x_refsource_MISC"],"url":"https://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/references/2
{"name":"https://github.com/marimo-team/marimo/pull/9098","tags":["x_refsource_MISC"],"url":"https://github.com/marimo-team/marimo/pull/9098"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/references/1
{"name":"https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/cna/references/0
{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-39987"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/adp/0/references/1
{"tags":["third-party-advisory"],"url":"https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:e4c6cd52af956d072cda3a5e4ccc3342d3360ba71b2bf84566e1df4132aa845d · sha256:75fb50c7bfbd8118… · /containers/adp/0/references/0
Attribution and limitations
- CISA Known Exploited Vulnerabilities JSON: CISA named for provenance; do not use CISA/DHS marks or imply endorsement Source →
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.