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CVE-2026-18798 is a double-free vulnerability in the OpenSSL QUIC server default packet handler. While validating a QUIC INITIAL packet, port_default_packet_handler() creates a QRX receive-record object and passes it to port_bind_channel() during connection creation. If port_bind_channel() fails, it frees the QRX object; the caller subsequently follows its error path and frees the same object again. A non-RFC 9000-compliant INITIAL packet with a destination connection ID shorter than eight bytes can cause port_bind_channel() to fail after original-DCID enrollment validation, triggering the double free. OpenSSL 4.0, 3.6, and 3.5 are affected; OpenSSL 3.4, 3.0, 1.1.1, and 1.0.2 are not affected. The OpenSSL FIPS module is not affected because QUIC is outside its module boundary.
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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.
A network-accessible vulnerability with low attack complexity and no required privileges or user interaction. The supplied CVSS v3 vector indicates high confidentiality and availability impact, with no integrity impact. It is associated with Debian Linux 13.0/14.0 and Red Hat Enterprise Linux 9/10 packages including OpenSSL and EDK2 components.
An OpenSSL vulnerability addressed by Debian DSA-6465-1; the advisory characterizes the grouped issues as potentially causing denial of service.
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.