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CVE-2026-20026 is a vulnerability in the Snort 3 Detection Engine’s processing of DCE/RPC requests affecting multiple Cisco products that embed or ship Snort 3. The issue is caused by an error in buffer handling logic when parsing/processing DCE/RPC traffic, resulting in a buffer use-after-free read condition. An unauthenticated remote attacker can exploit the flaw by sending a large number of DCE/RPC requests over an established connection that is inspected by Snort 3, which can lead to sensitive information disclosure from the inspection engine and/or an unexpected restart of the Snort 3 Detection Engine, interrupting packet inspection.
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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.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in Cisco Snort 3's buffer processing of DCE/RPC requests, allowing remote attackers to cause denial of service by crashing the detection engine.
A denial-of-service vulnerability in Snort 3's processing of DCE/RPC requests, allowing unauthenticated remote attackers to cause the detection engine to restart, impacting availability.
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.