What’s Vulnerable › Vulnerabilities

CVE-2026-53531: ratex-parser has unbounded parser recursion that leads to stack overflow (process abort)

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-12
• Weakness: CWE-400

Description

RaTeX is a KaTeX-compatible math rendering engine written in Rust. Prior to version 0.1.11, RaTeX’s recursive-descent parser recurses one (or more) native stack frame per nesting level at `{`, `\left`, `\sqrt{`, `^{`, etc, with no maximum depth limit. A short, ~10 KB input of nested groups overflows the 8 MB main-thread stack and aborts the process. With `panic = "abort"` (`Cargo.toml:48`), and because a Rust stack overflow is always a fatal `SIGABRT` regardless of panic strategy this is an unrecoverable, whole-process denial of service reachable from a single untrusted LaTeX string. Version 0.1.11 fixes the issue.

Affected products

• erweixin RaTeX: before 0.1.11

References

• https://github.com/erweixin/RaTeX/security/advisories/GHSA-4w5h-hx6r-28q7
• https://github.com/erweixin/RaTeX/security/advisories/GHSA-4w5h-hx6r-28q7

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