Boxlite read-only volume remount bypass
CVE-2026-46695 is a critical sandbox-escape vulnerability in Boxlite prior to version 0.9.0. Boxlite runs untrusted code inside lightweight virtual machines and OCI containers, and affected versions mounted host directories shared via virtiofs as guest-side read-only by relying on the guest to set MS_RDONLY. However, the default guest capability set still included CAP_SYS_ADMIN. As a result, malicious code running inside the sandbox could remount an ostensibly read-only shared directory as read-write using a remount operation such as mount -o remount,rw <path>, then write through that share to the host filesystem. This breaks Boxlite’s advertised read-only isolation guarantees and allows arbitrary write operations against directories that should have remained read-only. The issue was fixed in v0.9.0 by enforcing read-only at the hypervisor level via krun_add_virtiofs3 and by dropping CAP_SYS_ADMIN from the default guest capability set.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
krun_add_virtiofs3 and removes CAP_SYS_ADMIN from the default guest capability set, eliminating the guest-side remount bypass described in the advisory.Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A privilege/control bypass issue in Boxlite prior to version 0.9.0 where unrestricted kernel capabilities inside containers allow malicious code to remount directories as read-write and perform arbitrary writes on directories intended to be read-only.
A critical sandbox-escape and privilege-escalation vulnerability in boxlite where untrusted code inside a sandbox could remount a virtiofs shared host directory as read-write and modify the host filesystem, breaking the product's read-only isolation guarantees.
The version that knows your environment.
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.