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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.

kin-openapi 是一个用于处理 OpenAPI 文件的 Go 项目。在版本 0.124.0 至 0.142.0 之间，openapi3filter.sliceMapToSlice 函数（位于 openapi3filter/req_resp_decoder.go 中）会将攻击者可控的来自 deepObject 查询参数的稀疏索引转换为密集切片。该转换过程通过从零到最大提供索引分配内存条目来完成，随后 buildResObj 会创建另一个相同长度的切片。由于此内存分配发生在 schema 验证之前，因此 max

CVSS 8.7 · High EPSS 0.30% · P23

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

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
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Qwen3.6-35B-A3B · 10428 chars
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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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