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CVE-2026-33871 is a denial-of-service vulnerability in Netty's HTTP/2 handling. In Netty versions prior to 4.1.132.Final and 4.2.10.Final, a remote attacker can send a flood of HTTP/2 CONTINUATION frames to a Netty HTTP/2 server and trigger excessive CPU consumption. The flaw is caused by the absence of an effective limit on the number of CONTINUATION frames processed, and existing size-based protections can be bypassed through the use of zero-byte frames. This allows a low-bandwidth attacker to keep the server busy processing frame sequences until it becomes unresponsive.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Another Netty denial-of-service vulnerability mentioned only as part of vendor security history.
A previously disclosed Netty denial-of-service/request smuggling vulnerability mentioned only as part of vendor security history.
A high-severity denial-of-service vulnerability in the bundled io.netty:netty-codec-http2 dependency used by Atlassian Bamboo, which could disrupt HTTP/2 processing and impact service availability.
Denial-of-service vulnerability in the io.netty:netty-codec-http2 dependency affecting Atlassian Bamboo Data Center and Confluence Data Center.
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.