Unauthenticated Arbitrary File Creation or Truncation in Splunk PostgreSQL Sidecar Service
CVE-2026-20253 is a critical vulnerability in Splunk Enterprise versions below 10.2.4 and 10.0.7, and Splunk Cloud Platform versions below 10.4.2604.3 and 10.2.2510.14. The flaw exists in a PostgreSQL sidecar service endpoint that lacks authentication controls. Because the endpoint does not enforce authentication, any network-reachable attacker can invoke file operations without credentials and create or truncate arbitrary files on the affected system. Based on the provided content, the vulnerable functionality is exposed through the PostgreSQL sidecar service endpoint rather than the primary authenticated application workflow.
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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
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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
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated arbitrary file creation/truncation vulnerability in a PostgreSQL sidecar service endpoint in Splunk Enterprise that could lead to full system compromise, data destruction, or persistence of malicious code.
An unauthenticated arbitrary file creation and truncation vulnerability in a Splunk Enterprise PostgreSQL sidecar service endpoint that could allow attackers to manipulate files, damage databases, or plant malicious files.
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.