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CVE-2026-39833 is a protection-mechanism failure in the SSH agent implementation of golang.org/x/crypto prior to version 0.52.0. The in-memory keyring returned by NewKeyring() accepted keys configured with the ConfirmBeforeUse constraint, but did not implement or enforce the requested confirmation requirement. Consequently, signing operations could proceed without a confirmation prompt and without notifying the caller that the requested constraint was unsupported. Version 0.52.0 changes NewKeyring() to return an error when unsupported constraints are requested.
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What an attacker gets, and what they’ve been doing with it.
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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.
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A security-bypass vulnerability in golang.org/x/crypto/ssh/agent resulting from unenforced key confirmation, addressed in the podman-tui security update.
A security-bypass vulnerability in golang.org/x/crypto/ssh/agent in which key confirmation is not enforced, addressed through the podman-tui Fedora update.
A vulnerability addressed by the openSUSE glab package update; no technical details are provided.
One of multiple vulnerabilities in golang.org/x/crypto/ssh.
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.