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ExploitedNot in CISA KEV yetFix available

CVE-2026-40242

Exploitation confirmed. First attested on 2026-09-17 by GCVE · previdian, GCVE · shadowserver.

  • Published2026-04-10
  • Fixed in1.17.3
  • WeaknessCWE-918

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to 1.17.3, the /api/templates/fetch endpoint accepts a caller-supplied url parameter and performs a server-side HTTP GET request to that URL without authentication and without URL scheme or host validation. The server's response is returned directly to the caller. type. This constitutes an unauthenticated SSRF vulnerability affecting any publicly reachable Arcane instance. This vulnerability is fixed in 1.17.3.

Timeline

dates in UTC
  1. 2026-04-1021:16CVE publishedNVD
  2. 2026-09-17Listed as exploited by GCVEGCVE
  3. 2026-09-17Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-40242?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-40242?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Getarcane arcane
BranchAffectedFixed in
1.17< 1.17.31.17.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Getarcane arcane to 1.17.3

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • GCVEexploitation2026-09-17
  • CISA-ADPSSVC decisionpoc2026-04-13
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.17.2read 2026-10-23
  • NVDCVSS 3.16.5read 2026-10-23
  • CNAweakness (CWE)CWE-918read 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published
2026-04-10
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-40242?

Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to 1.17.3, the /api/templates/fetch endpoint accepts a caller-supplied url parameter and performs a server-side HTTP GET request to that URL without authentication and without URL scheme or host validation. The server's response is returned directly to the caller. type. This constitutes an unauthenticated SSRF vulnerability affecting any publicly reachable Arcane instance. This vulnerability is fixed in 1.17.3.

Is CVE-2026-40242 actively exploited?

A proof-of-concept exploit exists for CVE-2026-40242, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-40242?

CVE-2026-40242 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

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