What is GHSA-F3VW-587G-R29G?

GHSA-F3VW-587G-R29G is a critical-severity path traversal vulnerability in sapper (npm), affecting versions < 0.27.11. It is fixed in 0.27.11. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.

Which versions of sapper are affected by GHSA-F3VW-587G-R29G?

sapper (npm) versions < 0.27.11 is affected.

Is there a fix for GHSA-F3VW-587G-R29G?

Yes. GHSA-F3VW-587G-R29G is fixed in 0.27.11. Upgrade to this version or later.

Is GHSA-F3VW-587G-R29G exploitable, and should I be worried?

Whether GHSA-F3VW-587G-R29G is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether GHSA-F3VW-587G-R29G is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix GHSA-F3VW-587G-R29G?

Upgrade sapper to 0.27.11 or later.

GHSA-F3VW-587G-R29G in sapper

Q: Which versions of sapper are affected by GHSA-F3VW-587G-R29G?

sapper (npm) versions < 0.27.11 is affected.

Q: Is there a fix for GHSA-F3VW-587G-R29G?

Yes. GHSA-F3VW-587G-R29G is fixed in 0.27.11. Upgrade to this version or later.

Q: Is GHSA-F3VW-587G-R29G exploitable, and should I be worried?

Whether GHSA-F3VW-587G-R29G is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether GHSA-F3VW-587G-R29G is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix GHSA-F3VW-587G-R29G?

Upgrade sapper to 0.27.11 or later.

GHSA-F3VW-587G-R29G

GHSA-F3VW-587G-R29G is a critical-severity path traversal vulnerability in sapper (npm), affecting versions < 0.27.11. It is fixed in 0.27.11.

Does this CVE actually affect you?

Kodem shows which CVEs are reachable and running in your applications, so you fix what's exploitable, not just what's listed.

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Runtime intelligence, not another scanner.

Summary

Path Traversal in sapper

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.

Impact

Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.

Affected versions

sapper (< 0.27.11)

Security releases

sapper → 0.27.11 (npm)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade to version 0.27.11 or later.

Frequently Asked Questions

What is GHSA-F3VW-587G-R29G? GHSA-F3VW-587G-R29G is a critical-severity path traversal vulnerability in sapper (npm), affecting versions < 0.27.11. It is fixed in 0.27.11. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
Which versions of sapper are affected by GHSA-F3VW-587G-R29G? sapper (npm) versions < 0.27.11 is affected.
Is there a fix for GHSA-F3VW-587G-R29G? Yes. GHSA-F3VW-587G-R29G is fixed in 0.27.11. Upgrade to this version or later.
Is GHSA-F3VW-587G-R29G exploitable, and should I be worried? Whether GHSA-F3VW-587G-R29G is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether GHSA-F3VW-587G-R29G is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix GHSA-F3VW-587G-R29G? Upgrade sapper to 0.27.11 or later.