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GHSA-6jxj-px6v-747wmedium6.3

Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage

Impact

Crass recursively parses CSS simple blocks and functions without a depth guard. An attacker-controlled value containing many deeply nested blocks can recurse until Ruby raises SystemStackError: stack level too deep, or can cause excessive memory usage.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

crass RubyGems
Affected range Recorded fix
Earlier releases before 1.0.7Ecosystem versions1.0.7

Version evidence: OSV · GHSA-6jxj-px6v-747w

View original version evidence (12 explicit versions)

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

rgrove · GitHub_M

crass

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 1.0.7

unaffected

unknown

Other versions: unknown

Original source description

Impact

Crass recursively parses CSS simple blocks and functions without a depth guard. An attacker-controlled value containing many deeply nested blocks can recurse until Ruby raises SystemStackError: stack level too deep, or can cause excessive memory usage.

Patches

This is fixed in Crass 1.0.7, which adds a configurable depth limit with a conservative default.

Workarounds

Add SystemStackError handling around Crass calls in your application. Buy more RAM.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-61846

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-674 ↗

CWE-674: Uncontrolled Recursion

GitHub_M

Related →
Contributing organizations · 1
GitHub_M

Assigning organization

2026-10-30

What changed

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References

4 sources
github.com/rgrove/crass/security/advisories/GHSA-6jxj-px6v-747w
Security advisoryGitHub_M
github.com/rgrove/crass/commit/cf68287356ec6e20d51cfc4a2d0c3912b7334e99
PatchGitHub_M
github.com/rgrove/crass
Source reference
github.com/rgrove/crass/releases/tag/v1.0.7
Release notesGitHub_M