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CVE-2026-48748 is a memory exhaustion vulnerability in Netty's HTTP/3 codec affecting versions prior to 4.2.15.Final. The flaw is in QPACK header processing, specifically in io.netty.handler.codec.http3.QpackDecoder#shouldWaitForDynamicTableUpdates, when handling HTTP/3 header blocks that reference dynamic table entries the peer has not yet received. Under vulnerable configurations, the decoder can create an effectively unbounded number of blocked streams because resource allocation is not properly limited or throttled. This can accumulate state until the process exhausts heap memory and terminates with an out-of-memory condition. The issue is classified as allocation of resources without limits or throttling.
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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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A separate Netty vulnerability involving unbounded resource allocation or lack of throttling, mentioned as another issue fixed in the same release.
A Netty HTTP/3 QPACK decoder resource-allocation flaw that can cause denial of service when processing crafted header blocks referencing unavailable dynamic table entries.
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.