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CVE-2026-68537— Fulgur: Unbounded page slicing from attacker-controlled CSS height causes denial of service

Quick assessment

Affected
fulgur-rs fulgur
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.

将不受信任的 HTML/CSS 转换为 PDF，通常运行在需要处理来自多个租户输入数据的服务器上。在 0.19.0 之前的版本中，如果一个 body 直接子元素的 CSS 解析后高度远远超过页面高度，它会被逐页切片，且切片数量没有上限。此问题已在 0.19.0 版本中修复。修复内容包括：引入 上限来限制切片循环（即使高度为 也会停止），并对非有限的布局高度进行清洗，使其不再能驱动该循环。作为临时缓解措施，建议在将 HTML 传入 fulgur 之前，对不受信任的 CSS 进行验证或约束（特别是 body 层级元素上

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-68537

Vulnerability Information
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Vulnerability Title
Fulgur: Unbounded page slicing from attacker-controlled CSS height causes denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
`fulgur` converts untrusted HTML/CSS into PDF, commonly on a server that processes input supplied by many tenants. In versions prior to 0.19.0, a body-direct child whose CSS-resolved height greatly exceeds the page height was sliced into one fragment per page with no upper bound. This is fixed in version 0.19.0. A `MAX_PAGES` cap bounds the slice loop — halting it even for a `+inf` height — and non-finite layout heights are sanitized so they can no longer drive the loop. As a workaround, validate or constrain untrusted CSS (in particular `height` / `vh` on body-level elements) before passing HTML to fulgur.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
fulgur-rs fulgur < 0.19.0 -

II. Public POCs for CVE-2026-68537

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III. Intelligence Information for CVE-2026-68537

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Patches & Fixes for CVE-2026-68537 (1)

Vendor Advisories for CVE-2026-68537 (2)

IV. Related Vulnerabilities

Same product: fulgur
Same vendor: fulgur-rs
Same weakness: CWE-400

V. Comments for CVE-2026-68537

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