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CVE-2026-61845— Crass: Large numeric exponents cause CPU and memory denial of service

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 Level 3 规范的 Ruby CSS 解析器。在 1.0.7 版本之前，Crass 会在将结果截断至 之前，对采用 CSS 科学计数法的数值进行无界指数运算。使用 Crass 解析由攻击者控制的 CSS 字符串的应用程序，可能被迫在处理极小的输入时消耗不成比例的 CPU 和内存资源，从而导致程序崩溃。该问题已在 1.0.7 版本中修复。

CVSS 8.9 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
rgrove crass < 1.0.7 affected
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I. Basic Information for CVE-2026-61845

Vulnerability Information
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Vulnerability Title
Crass: Large numeric exponents cause CPU and memory denial of service
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, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, potentially resulting in a crash. 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:H/SC:N/SI:N/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rgrove crass < 1.0.7 -

II. Public POCs for CVE-2026-61845

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III. Intelligence Information for CVE-2026-61845

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Other References for CVE-2026-61845 (3)

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

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
CVE-2026-61848 6.3 MEDIUM Crass: Non-ASCII characters cause superlinear CPU consumption

IV. Related Vulnerabilities

Same product: crass
Same vendor: rgrove
Same weakness: CWE-789