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CVE-2026-85730— smol-toml: Denial of Service via malformed TOML documents

Quick assessment

Affected
squirrelchat smol-toml
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.

Squirrel Chat smol-toml是Squirrel Chat组织的一个轻量级的TOML解析库。 Squirrel Chat smol-toml 1.7.1之前版本存在安全漏洞，该漏洞源于解析数组或内联表时未正确处理无换行注释，skipUntil()函数在输入末尾将光标重置到字符串开头，导致解析器无限循环。当应用程序解析攻击者控制的TOML时，可能消耗服务处理能力。

CVSS 8.2 · High EPSS 0.38% · P32

Possible ATT&CK Techniques 1 AI

T1480 · Execution Guardrails

Affected Version Matrix 1

VendorProduct Version RangeStatus
squirrelchat smol-toml < 1.7.1 affected
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I. Basic Information for CVE-2026-85730

Vulnerability Information
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Vulnerability Title
smol-toml: Denial of Service via malformed TOML documents
Source: CVE Program / CVE List V5
Vulnerability Description
smol-toml is a small, fast, and correct TOML parser and serializer. Prior to 1.7.1, parse() can enter an infinite loop when a value inside an array or inline table is followed by a comment with no trailing newline. In src/util.ts, skipUntil() calls indexOfNewline(), receives -1 at the end of input, and resets the cursor to the beginning of the string instead of leaving the structure scan. The parser then hangs indefinitely and can consume a service's processing capacity when an application parses attacker-controlled TOML. This issue is fixed in version 1.7.1.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
循环条件输入未经检查
Source: CVE Program / CVE List V5
Vulnerability Title
Squirrel Chat smol-toml 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Squirrel Chat smol-toml是Squirrel Chat组织的一个轻量级的TOML解析库。 Squirrel Chat smol-toml 1.7.1之前版本存在安全漏洞，该漏洞源于解析数组或内联表时未正确处理无换行注释，skipUntil()函数在输入末尾将光标重置到字符串开头，导致解析器无限循环。当应用程序解析攻击者控制的TOML时，可能消耗服务处理能力。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
squirrelchat smol-toml < 1.7.1 -

II. Public POCs for CVE-2026-85730

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III. Intelligence Information for CVE-2026-85730

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Patches & Fixes for CVE-2026-85730 (2)

Vendor Advisories for CVE-2026-85730 (1)

IV. Related Vulnerabilities

Same weakness: CWE-606

V. Comments for CVE-2026-85730

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