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CVE-2026-28387 is a memory-safety flaw in OpenSSL's DANE client processing that can trigger a use-after-free and, in some cases, a double-free on the client side during TLSA-based server authentication. The issue occurs only in an uncommon DANE validation scenario where the client processes TLSA records using both PKIX certificate usages, specifically PKIX-TA and PKIX-EE, together with DANE-TA usage, and the server publishes a TLSA RRset containing both categories. Under those conditions, OpenSSL's DANE client code can mishandle object lifetime during certificate association or validation, leading to freed memory being reused or freed again. The flaw affects OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, and 1.1.1 branches; OpenSSL 1.0.2 is not affected. The vulnerable code is outside the FIPS module boundary, and no FIPS modules are affected.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability in OpenSSL addressed in Alpine Linux stable releases 3.20.10, 3.21.7, 3.22.4, and 3.23.4.
A potential use-after-free in DANE client code in OpenSSL.
A potential use-after-free in OpenSSL DANE client code that can expose affected applications to denial-of-service conditions when processing crafted input.
Potential use-after-free in OpenSSL DANE client code.
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.