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CVE-2026-83347 is an easily exploitable denial-of-service vulnerability in the Oracle Net Services component of Oracle Database Server. Oracle Database Server versions 23.4.0 through 23.26.3 are affected. An unauthenticated attacker with network access to the TCPS service can exploit the issue when human interaction by a party other than the attacker occurs, causing Oracle Net Services to hang or repeatedly crash.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Oracle Database Server referenced by the September 15, 2026 patch publication.
An unauthenticated, network-accessible denial-of-service vulnerability in Oracle Net Services in Oracle Database Server versions 23.4.0 through 23.26.3. Exploitation via TCPS requires user interaction and can cause a hang or repeatable complete crash of Oracle Net Services. CVSS 3.1: 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
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.