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CVE-2026-63075 is a resource-exhaustion vulnerability in the OpenSSL QUIC stack. OpenSSL retains metadata for transmitted ACK-only packets even though QUIC peers are not required to acknowledge those packets. A peer can repeatedly send ack-eliciting traffic, such as PING frames, to induce ACK-only responses while withholding acknowledgments for ack-eliciting traffic. This causes ACK-only packet metadata to accumulate for the lifetime of the connection. The issue affects OpenSSL 4.0, 3.6, 3.5, and 3.4; OpenSSL 3.0, 1.1.1, and 1.0.2 are not affected. The FIPS module is not affected because the QUIC implementation is outside its boundary.
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No public exploit code observed for this vulnerability.
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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.
Low-severity resource-exhaustion flaw in OpenSSL QUIC processing. Withholding acknowledgments while inducing ACK-only packets causes retained metadata and unbounded connection-scoped memory growth.
A vulnerability addressed by the referenced FreeBSD OpenSSL package security update; no technical flaw details are provided.
An OpenSSL vulnerability addressed by Debian DSA-6465-1; the advisory characterizes the grouped issues as potentially causing denial of service.
An OpenSSL-related vulnerability referenced by CVE ID only; the content provides no technical details.
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.