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CVE-2026-77354— kin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding

Quick assessment

Affected
getkin kin-openapi
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.

getkin kin-openapi是getkin个人开发者开源的一款OpenAPI规范解析框架。 getkin kin-openapi 0.124.0版本至0.142.0之前版本存在资源管理错误漏洞，该漏洞源于openapi3filter.sliceMapToSlice函数将deepObject查询参数中攻击者控制的稀疏索引转换为密集切片，导致在模式验证前分配大量内存，从而使未认证客户端发送恶意查询时造成多GB堆分配，引发OOM终止或重启循环。

CVSS 8.7 · High EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkin kin-openapi >= 0.124.0, < 0.142.0 affected
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I. Basic Information for CVE-2026-77354

Vulnerability Information
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Vulnerability Title
kin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding
Source: CVE Program / CVE List V5
Vulnerability Description
kin-openapi is a Go project for handling OpenAPI files. From 0.124.0 until 0.142.0, openapi3filter.sliceMapToSlice in openapi3filter/req_resp_decoder.go converts attacker-controlled sparse indexes from a deepObject query parameter into a dense slice by allocating entries from zero through the largest supplied index, after which buildResObj creates another slice of the same length. This allocation occurs before schema validation, so maxItems does not prevent it. An unauthenticated client can send a small query such as param[items][50000000]=x to an endpoint whose deepObject schema contains an array, forcing multi-gigabyte heap allocation and causing an OOM kill or restart loop. Other request-body encodings and styled parameters that do not produce bracketed integer indexes are not affected. This issue is fixed in version 0.142.0.
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
getkin kin-openapi 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getkin kin-openapi是getkin个人开发者开源的一款OpenAPI规范解析框架。 getkin kin-openapi 0.124.0版本至0.142.0之前版本存在资源管理错误漏洞，该漏洞源于openapi3filter.sliceMapToSlice函数将deepObject查询参数中攻击者控制的稀疏索引转换为密集切片，导致在模式验证前分配大量内存，从而使未认证客户端发送恶意查询时造成多GB堆分配，引发OOM终止或重启循环。
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
getkin kin-openapi >= 0.124.0, < 0.142.0 -

II. Public POCs for CVE-2026-77354

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: uncontrolled heap allocation (~1.6GB) exceeds 1GB mem_limit -> reproducer OOM-killed (exit 137)
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 10428 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-77354

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Patches & Fixes for CVE-2026-77354 (2)

Vendor Advisories for CVE-2026-77354 (1)

Vendor Pages for CVE-2026-77354 (1)

IV. Related Vulnerabilities

Same product: kin-openapi
Same vendor: getkin
Same weakness: CWE-400

V. Comments for CVE-2026-77354

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