CVE-2026-61848
Crass: Non-ASCII characters cause superlinear CPU consumption
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Crass: Non-ASCII characters cause superlinear CPU consumption
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
CVE-2026-61848- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-400
- Updated
- 2026-11-02
EUVDEUVD-2026-114324
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
EUVD-2026-114324- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8vfg-2r28-hvhj
Crass: Non-ASCII characters cause superlinear CPU consumption
Impact
When parsing an input containing non-ASCII characters, inefficiencies in how Crass tracks the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled input consisting of many non-ASCII characters could cause excessive CPU consumption and potentially denial of service.
Patches
This is fixed in Crass 1.0.7.
Workarounds
Avoid passing non-ASCII input to Crass. Or cultivate patience.
- Record
GHSA-8vfg-2r28-hvhj- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-400
- Updated
- 2026-11-02
NVD
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
CVE-2026-61848- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-400
- Updated
- 2026-11-02
OSV
Crass: Non-ASCII characters cause superlinear CPU consumption
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
CVE-2026-61848- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-61848
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
DEBIAN-CVE-2026-61848- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVGHSA-8vfg-2r28-hvhj
Crass: Non-ASCII characters cause superlinear CPU consumption
Impact
When parsing an input containing non-ASCII characters, inefficiencies in how Crass tracks the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled input consisting of many non-ASCII characters could cause excessive CPU consumption and potentially denial of service.
Patches
This is fixed in Crass 1.0.7.
Workarounds
Avoid passing non-ASCII input to Crass. Or cultivate patience.
- Record
GHSA-8vfg-2r28-hvhj- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-61848
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in superlinear parsing time. An attacker-controlled CSS input consisting of many non-ASCII characters can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.
- Record
UBUNTU-CVE-2026-61848- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L - Updated
- 2026-11-04
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
crassRubyGems |
before 1.0.7 | 1.0.7 |
ruby-crassDebian:12 |
All versions, plus listed versions 1.0.2-31.0.6-11.0.7-11.0.8-1 |
None known |
ruby-crassDebian:13 |
All versions, plus listed versions 1.0.6-11.0.7-11.0.8-1 |
None known |
ruby-crassDebian:14 |
before 1.0.7-1, plus listed versions 1.0.6-1 |
1.0.7-1 |
crassRubyGems |
before 1.0.7, plus listed versions 0.0.10.0.20.1.00.2.00.2.1 Show 7 moreShow less1.0.01.0.11.0.21.0.31.0.41.0.51.0.6 |
1.0.7 |
ruby-crassUbuntu:16.04:LTS |
All versions, plus listed versions 1.0.2-2 |
None known |
ruby-crassUbuntu:18.04:LTS |
All versions, plus listed versions 1.0.2-2 |
None known |
ruby-crassUbuntu:20.04:LTS |
All versions, plus listed versions 1.0.2-2 |
None known |
ruby-crassUbuntu:22.04:LTS |
All versions, plus listed versions 1.0.2-2.11.0.2-3 |
None known |
ruby-crassUbuntu:24.04:LTS |
All versions, plus listed versions 1.0.2-3 |
None known |
ruby-crassUbuntu:26.10 |
All versions, plus listed versions 1.0.6-1ubuntu1 |
None known |
ruby-crassUbuntu:26.04:LTS |
All versions, plus listed versions 1.0.6-1ubuntu1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, facts, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-61848 is a medium vulnerability (CVSS 6.3) in Rgrove Crass, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.49%, the 41st percentile. Fixed in crass 1.0.7.
References
github.com/rgrove/crass/security/advisories/GHSA-8vfg-2r28-hvhj
nvd.nist.gov/vuln/detail/CVE-2026-61848