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CVE-2026-44635— Kysely: JSON-path traversal injection via unsanitized path-leg metacharacters in `JSONPathBuilder.key()` / `.at()`

Quick assessment

Affected
kysely-org kysely
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kysely是Kysely开源的一个类型安全的TypeScript SQL查询构建器。 Kysely 0.26.0至0.28.16版本存在安全漏洞，该漏洞源于DefaultQueryCompiler.visitJSONPathLeg未转义JSON路径元字符，导致攻击者可通过控制输入遍历到开发者未意图暴露的兄弟和子字段，造成JSON子字段的读写访问。

CVSS 7.5 · High EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
kysely-org kysely >= 0.26.0, < 0.28.17 affected
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I. Basic Information for CVE-2026-44635

Vulnerability Information
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Vulnerability Title
Kysely: JSON-path traversal injection via unsanitized path-leg metacharacters in `JSONPathBuilder.key()` / `.at()`
Source: CVE Program / CVE List V5
Vulnerability Description
Kysely is a type-safe TypeScript SQL query builder. From 0.26.0 to 0.28.16, DefaultQueryCompiler.visitJSONPathLeg does not escape JSON-path metacharacters (., [, ], *, **, ?). When attacker-controlled input flows into eb.ref(col, '->$').key(input) or .at(input) — including type-safe code where the JSON column is shaped like Record<string, T> so K extends string is the inferred type — every dot becomes a path-leg separator, letting an attacker traverse from the intended key into sibling and child fields the developer never meant to expose. The result is read access (and, in update statements, write access) to JSON sub-fields outside the intended scope across MySQL, PostgreSQL ->$/->>$, and SQLite. This vulnerability is fixed in 0.28.17.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Kysely 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kysely是Kysely开源的一个类型安全的TypeScript SQL查询构建器。 Kysely 0.26.0至0.28.16版本存在安全漏洞，该漏洞源于DefaultQueryCompiler.visitJSONPathLeg未转义JSON路径元字符，导致攻击者可通过控制输入遍历到开发者未意图暴露的兄弟和子字段，造成JSON子字段的读写访问。
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
kysely-org kysely >= 0.26.0, < 0.28.17 -

II. Public POCs for CVE-2026-44635

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10076 chars
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III. Intelligence Information for CVE-2026-44635

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Vendor Advisories for CVE-2026-44635 (1)

IV. Related Vulnerabilities

Same product: kysely
Same vendor: kysely-org
Same weakness: CWE-22

V. Comments for CVE-2026-44635

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