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CVE-2026-53530— ratex-parser panics on `\verb` with a multibyte delimiter (UTF-8 byte-boundary slice)

Quick assessment

Affected
erweixin RaTeX
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.

RaTeX 是一个基于 Rust 编写的、与 KaTeX 兼容的数学公式渲染引擎。在 0.1.11 版本之前，其公共解析入口函数 在接收到 9 字节输入 （即 后跟非 ASCII 字符 作为定界符）时会发生恐慌（panic）。在处理 命令时，解析器通过字节索引 截取内联文本（verbatim）参数；如果定界符是多字节的 UTF-8 字符，则索引位置 1 会落入该多字节字符的中间，从而导致 Rust 抛出异常：“byte index 1 is not a char boundary”（字节索引 1 不是字符边界）。由

CVSS 8.7 · High EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
erweixin RaTeX < 0.1.11 affected
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I. Basic Information for CVE-2026-53530

Vulnerability Information
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Vulnerability Title
ratex-parser panics on `\verb` with a multibyte delimiter (UTF-8 byte-boundary slice)
Source: CVE Program / CVE List V5
Vulnerability Description
RaTeX is a KaTeX-compatible math rendering engine written in Rust. Prior to version 0.1.11, the public parser entrypoint `ratex_parser::parse(&str)` panics on the 9-byte input `\verbéxé` (i.e. `\verb` followed by the non-ASCII delimiter `é`). When handling a `\verb` command, the parser slices the verbatim argument with byte indices (`arg[1..arg.len() - 1]`); if the delimiter character is multibyte UTF-8, index `1` lands inside that character and Rust panics with *“byte index 1 is not a char boundary”*. Because RaTeX’s release profile sets `panic = "abort"` (`Cargo.toml:48`), the panic aborts the entire process — not just the current request/thread — making this a hard denial of service for any service that renders untrusted LaTeX. Version 0.1.11 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
erweixin RaTeX < 0.1.11 -

II. Public POCs for CVE-2026-53530

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III. Intelligence Information for CVE-2026-53530

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Vendor Advisories for CVE-2026-53530 (1)

IV. Related Vulnerabilities

Same product: RaTeX
Same vendor: erweixin
Same weakness: CWE-248

V. Comments for CVE-2026-53530

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