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Back to active CVEs
Critical · CVSS 9.8CVE-2026-111058GHSA-RV4M-XM3F-3CCQ

Mercury: Unauthenticated Remote Code Execution via /api/kernelsCVE-2026-111058

Answer in brief

CVE-2026-111058 records a Critical severity (CVSS 9.8) vulnerability in Mercury: Unauthenticated Remote Code Execution via /api/kernels. The current sources do not mark it as known exploited. The current feed maps mljar/mercury (generic), mercury (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mljar/mercury (generic), mercury (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
mljar/mercurygeneric<3.2.63.2.6
mercurypip<=3.2.53.2.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for mljar/mercury, mercury.
  2. 2Review the reported fix. Update mljar/mercury to 3.2.6; mercury to 3.2.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. Prior to 3.2.6, default tokenless deployments allow anonymous clients to create Jupyter kernels and send execute_request messages containing arbitrary Python. The endpoint blocklist does not cover /api/kernels, and the websocket wrapper previously tracked idle activity without authorizing executable messages. This issue is fixed in version 3.2.6.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Mercury: Unauthenticated Remote Code Execution in /api/terminals - access control bypassSame mljar/mercury package
  • Mercury: Stored / DOM Cross-Site Scripting (XSS): mr.Markdown renders untrusted content as raw, unsanitized HTMLSame mljar/mercury package
  • Refresh Token Misuse via Validation Flaw in Multiple WSO2 Products Enables Unauthorized Resource ConsumptionAlso CWE-862
  • FOSSBilling: Low-privileged staff can read and modify configuration of deactivated extensionsAlso CWE-862
  • AIOHTTP: Secure attribute not enforced for shared cookieSame pip ecosystem
  • aiohttp server lacks an initial request/header timeoutSame pip ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-862
Source
CVE List V5
Source checked
Oct 19, 2026
References
4 linked sources
Open source record