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CVE-2025-6816 is a heap-based buffer overflow affecting the H5O__fsinfo_encode function in HDF5 1.14.6. Manipulation of data handled by this function can trigger the overflow through local exploitation. An exploit has been publicly disclosed. The precise triggering input and the extent of the resulting memory corruption are not established.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability whose CVSS vectors indicate local exploitation requiring low privileges, no user interaction, and low availability impact, with no confidentiality or integrity impact. The content does not identify the affected product or underlying flaw. Exploits and a patch are available.
A missing TLS hostname verification vulnerability in the Socket Appender component of Apache Log4j Core (versions 2.0-beta9 through 2.25.2) allows attackers to perform man-in-the-middle attacks and intercept sensitive log data if they can present a trusted certificate and intercept network traffic.
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.