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CVE-2026-61848— Crass: Non-ASCII characters cause superlinear CPU consumption

Quick assessment

Affected
rgrove crass
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Crass 是一个完全符合 CSS 语法第 3 级规范的 Ruby CSS 解析器。在 1.0.7 版本之前，当 Crass 解析包含非 ASCII 字符的输入时，由于对多字节字符位置跟踪机制存在效率问题，会导致解析时间呈超线性增长。因此，由攻击者控制的、包含大量非 ASCII 字符的 CSS 输入可能导致 CPU 过度消耗，进而引发拒绝服务（DoS）攻击。该问题已在 1.0.7 版本中修复。

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
rgrove crass < 1.0.7 affected
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I. Basic Information for CVE-2026-61848

Vulnerability Information
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Vulnerability Title
Crass: Non-ASCII characters cause superlinear CPU consumption
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rgrove crass < 1.0.7 -

II. Public POCs for CVE-2026-61848

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III. Intelligence Information for CVE-2026-61848

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Other References for CVE-2026-61848 (3)

Same Patch Batch · rgrove · 2026-10-30 · 4 CVEs total

CVE-2026-61845 8.9 HIGH Crass: Large numeric exponents cause CPU and memory denial of service
CVE-2026-61846 6.3 MEDIUM Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive
CVE-2026-61847 6.3 MEDIUM Crass: A large number of adjacent CSS comments can trigger a SystemStackError

IV. Related Vulnerabilities

Same product: crass
Same vendor: rgrove
Same weakness: CWE-400