npm package report

Is sapper safe?

1 known vulnerability, worst severity CRITICAL.

// reach

0 direct dependencies

none carry a known advisory

0 packages depend on it

an advisory here reaches each of them

Create a free accountfor every dependency path, dependent and what to upgrade

// ai model usage

Tracked for PyPI packages. HuggingFace models declare Python dependencies, so npm packages are not covered.

cvss

0.0

critical

severity band, no base score published

epss

not scored

chance of exploitation in 30 days

xyz score

0.0

medium

CyberXYZ composite out of 10

fig. 01 — GHSA-f3vw-587g-r29g, the advisory selected below

// 1 advisories

GHSA-f3vw-587g-r29g

CRITICAL

Versions of sapper prior to 0.27.11 are vulnerable to Path Traversal. It is possible to access sensitive files on the server through HTTP requests containing URL-encoded ../.

You may test a sapper application running in prod mode with curl -vvv http://localhost:3000/client/750af05c3a69ddc6073a/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd.

// recommendation

Upgrade to version 0.27.11 or later.

Checked 2026-10-04 at 01:08 UTC. The most recent advisory here was published 2020-09-03. Updated continuously from NVD, GHSA, OSV and CNA feeds.