Loading vulnerability…
CVE-2026-42505 is an information disclosure vulnerability in Go's crypto/tls implementation of TLS Encrypted Client Hello (ECH). During vulnerable handshakes, pre-shared key (PSK) identities were included in the unencrypted outer ClientHello, which undermined ECH's privacy goals. A passive network observer collecting TLS handshakes could use the exposed PSK identities to correlate sessions and de-anonymize the server hostname that ECH was intended to conceal. The issue was fixed by changing crypto/tls to omit the pre_shared_key extension from the ECH outer ClientHello and by clearing PSK identities and binders before constructing the outer ECH message. Fixes were applied in Go 1.26.5 and Go 1.25.12.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced in the advisory's CVE list without any descriptive details in the provided content.
Referenced in the advisory CVE list, but no description or discussion is provided in the content.
A CVE referenced by the advisory without descriptive details in the provided content.
An information disclosure vulnerability in Go's crypto/tls package where Encrypted Client Hello (ECH) handshakes can expose pre-shared key identities in the unencrypted ClientHello, enabling a passive observer to de-anonymize and link connections.
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.