GHSA-p799-q2pr-6mxj go.rgst.io/stencil/v2 vulnerable to Path Traversal
A path traversal vulnerability in the stencil library allows attackers to execute code or modify files via malicious archives.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is GHSA-p799-q2pr-6mxj?
GHSA-p799-q2pr-6mxj is a path traversal vulnerability in go.rgst.io/stencil, published on 29 Mar 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Impact
The library used to extract archives (github.com/jaredallard/archives) was vulnerable to the "zip slip" vulnerability. This is used to extract native extension archives and repository source archives. A native extension or repository archive could be crafted in such a way where a remote code execution or modification/reading of a file is possible using the user who is running stencil.
The severity is marked as "medium" because native extensions have always considered to be "unsafe" to run when not trusted. Native extensions are arbitrary code being ran, which could always do this same exploit with less steps. The medium severity is to reflect that this could be done even when a user is not using a native extension, for example a repository source archive. However, one would need to mutate the archives provided by Github or perform some hackery with links, which may not be possible. Thus, "medium" is used out of an abundance of caution where I would've labeled this as "low".
Patches
Patched in 2.3.0 and above.
Workarounds
No workarounds are present.
References
https://github.com/jaredallard/archives/security/advisories/GHSA-j95m-rcjp-q69h
Which versions are affected by GHSA-p799-q2pr-6mxj?
4 open source packages ship an affected version, including go.rgst.io/stencil/v2 and go.rgst.io/stencil.
| Package | Affected | Fixed in |
|---|---|---|
go.rgst.io/stencil/v2 Go | All versions | 2.3.0 |
go.rgst.io/stencil/v2 Go | All versions | 2.3.0 |
go.rgst.io/stencil/v2 Go | All versions | 2.3.0 |
go.rgst.io/stencil Go | All versions | None |
How do I fix GHSA-p799-q2pr-6mxj?
Upgrade go.rgst.io/stencil/v2 to 2.3.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is GHSA-p799-q2pr-6mxj being exploited?
There is no known exploitation of GHSA-p799-q2pr-6mxj in the wild and no public exploit code.
Sources
Also known as GO-2025-3584.