GHSA-m8j6-rc5x-wv36 nono-py's policy JSON accepts unknown security fields
Attackers can bypass network restrictions in nono-py sandboxes by exploiting ignored policy fields or missing proxy enforcement, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-m8j6-rc5x-wv36?
GHSA-m8j6-rc5x-wv36 is a vulnerability in nono-py, published on 26 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Summary
nono-py policy handling could fail open in two ways. First, resolving a policy-derived ProxyConfig did not automatically enforce CapabilitySet.proxy_only, allowing sandboxed children to bypass a resolved domain allowlist by using direct network access. Second, policy JSON accepted unknown security-sensitive fields, so misspelled or unsupported restrictions could be silently ignored.
Impact
A sandboxed child may receive broader network access than the policy author intended. This can allow outbound requests outside the configured proxy allowlist and may expose sensitive data depending on the execution environment and workload.
Older-kernel note
On Linux kernels without Landlock ABI v4 network rules, patched versions continue to support proxy-only enforcement through the seccomp supervisor fallback introduced in 807fb4b. Users on older kernels should ensure policy-resolved proxy configurations are coupled to CapabilitySet.proxy_only(proxy); merely injecting proxy environment variables is not sufficient.
Which versions are affected by GHSA-m8j6-rc5x-wv36?
2 open source packages ship an affected version, including nono-py.
| Package | Affected | Fixed in |
|---|---|---|
nono-py PyPI | All versions | 0.10.1 |
nono-py PyPI | All versions | 0.10.1 |
How do I fix GHSA-m8j6-rc5x-wv36?
Upgrade nono-py to 0.10.1 or later.
Is GHSA-m8j6-rc5x-wv36 being exploited?
There is no known exploitation of GHSA-m8j6-rc5x-wv36 in the wild and no public exploit code.