Information disclosure in n8n Task Runner via unsafe Buffer allocation
CVE-2025-61917 is an information disclosure vulnerability in n8n affecting versions 1.65.0 through before 1.114.3. In the Task Runner context, untrusted code could access Node.js unsafe buffer allocation primitives, specifically Buffer.allocUnsafe() and Buffer.allocUnsafeSlow(). Because these APIs return uninitialized memory, an authenticated user able to execute code through n8n Task Runners could allocate buffers containing residual data from the same Node.js process. Exposed data could include contents left by prior requests or tasks, including secrets, tokens, and other sensitive runtime material. The issue was patched in 1.114.3, with content also indicating a fixed release in 1.115.0.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
n8n-nodes-base.code to the NODES_EXCLUDE environment variable. Also run Task Runners in external mode so untrusted task code executes in a separate sidecar container rather than in the main n8n process, reducing exposure to in-process memory disclosure. More generally, restrict which authenticated users are permitted to execute untrusted code in Task Runners.Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity information disclosure issue in n8n task runners caused by unsafe buffer allocation (allocUnsafe), potentially exposing uninitialized memory with sensitive runtime data to authenticated users.
Unsafe buffer allocation in n8n (noted in context of task runners/code node) leading to potential sensitive information exposure.
Unsafe buffer allocation in n8n (with Task Runners and Code Node enabled) leading to potential sensitive information exposure.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.