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CVE-2026-34183 is a denial-of-service vulnerability in the OpenSSL integrated QUIC stack. A malicious remote QUIC peer can flood a client or server with PATH_CHALLENGE frames, causing the local endpoint to allocate a corresponding PATH_RESPONSE frame for each received challenge. These PATH_RESPONSE allocations are retained until the peer acknowledges receipt. Because a malicious peer can continue sending PATH_CHALLENGE frames while withholding acknowledgements, memory consumption can grow without an effective bound, leading to heap exhaustion. The issue affects OpenSSL QUIC implementations in affected supported branches and is outside the OpenSSL FIPS module boundary.
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What an attacker gets, and what they’ve been doing with it.
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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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Moderate denial-of-service flaw in OpenSSL's QUIC protocol handling where OpenSSL placed no limit on how many PATH_CHALLENGE frames it would accept and act on, leading to unbounded impact that required a library fix.
A Moderate-severity OpenSSL denial-of-service vulnerability involving unbounded memory growth in the QUIC PATH_CHALLENGE handler.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
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.