CVE-2026-46695

描述

Affected versions of `boxlite` mount host directories shared via virtiofs as guest-side read-only by setting `MS_RDONLY` from the guest. Because the default guest capability set included `CAP_SYS_ADMIN`, untrusted code running inside a sandbox could execute `mount -o remount,rw <path>` to re-flag the share as read-write and then write through to the host filesystem — fully escaping the read-only contract `boxlite` advertised to callers. The fix in v0.9.0 enforces read-only at the hypervisor level via `krun_add_virtiofs3` (so the guest's `MS_RDONLY` is no longer the authoritative gate) and drops `CAP_SYS_ADMIN` from the default guest capability set (matching Docker's defaults). This is a sandbox-escape bug: `boxlite` is a sandboxing runtime, so the read-only invariant is part of its security contract. CVSS rated 10.0 by the upstream advisory.

如何修補 CVE-2026-46695

要修補 CVE-2026-46695,請將受影響套件升級到下列已修補版本。

• —升級至 0.9.0 或更新版本

CVE-2026-46695 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 0.9.0

CVSS 分數

參考連結(8)

• ADVISORYgithub.com/advisories/GHSA-g6ww-w5j2-r7x3
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-46695
• PATCHgithub.com/boxlite-ai/boxlite
• PATCHpypi.org/project/boxlite
• WEBgithub.com/boxlite-ai/boxlite/pull/454