Read the docs
TI-2026-74658 Aliases CVE-2026-100350GHSA-h4r5-mxv5-8mjc

Repeated regexp compilation in kin-openapi deepObject query decoding

Priority MEDIUM 63CWE-1050Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

kin-openapi from 0.145.0 before 0.146.0 is affected. The openapi3filter package recompiles the same parameter-name regular expression for every query key while decoding deepObject query parameters, which is a loop-invariant recompilation (CWE-1050). An unauthenticated remote attacker can send a request with many unrelated query keys, making ValidateRequest perform work and allocations in proportion to the key count for each deepObject parameter, which can degrade availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

kin-openapi is a Go project for handling OpenAPI files. From 0.145.0 until 0.146.0, openapi3filter repeatedly calls regexp.MustCompile for the same parameter-name regular expression inside the per-query-key loop in urlValuesDecoder.DecodeObject used to decode a deepObject query parameter. An unauthenticated remote client can send an affected endpoint a request containing many unrelated query keys, causing ValidateRequest to perform work and allocations proportional to the attacker-controlled key count for every deepObject parameter. The expression itself is fixed and this is not regular expression denial of service; the resource consumption comes from loop-invariant recompilation. This issue is fixed in version 0.146.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00451 39th percentileScored 2026-11-07
Fix Fixed kin-openapi (getkin): 0.146.0github.com/getkin/kin-openapi (Go): 0.146.0Red Hat: 2 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getkinkin-openapi0.145.0 to before 0.146.00.146.0Patch availableCNA
—github.com/getkin/kin-openapi (Go)0.145.0 to before 0.146.00.146.0Patch availableGHSA-h4r5-mxv5-8mjc
  • kin-openapi Vendorgetkin Affected 0.145.0 to before 0.146.0 Fixed in 0.146.0 Patch available CNA
  • github.com/getkin/kin-openapi (Go) Vendor— Affected 0.145.0 to before 0.146.0 Fixed in 0.146.0 Patch available GHSA-h4r5-mxv5-8mjc

Remediation

Update github.com/getkin/kin-openapi to version 0.146.0. Red Hat fixes this in Red Hat Hardened Images through RHSA-2026:82637 and RHSA-2026:76677.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA kin-openapi (getkin) Fixed in 0.146.0
  • Fix · GHSA-h4r5-mxv5-8mjc github.com/getkin/kin-openapi (Go) Fixed in 0.146.0 Advisory →

Red Hat 2 advisories

  • RHSA-2026:82637 Released 2026-10-14 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images hugo-0.168.0-0.1.hum1@aarch64, hugo-0.168.0-0.1.hum1@s390x, hugo-0.168.0-0.1.hum1@src +1
  • RHSA-2026:76677 Released 2026-10-06 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images grafana12.4-12.4.12-0.4.hum1@aarch64, grafana12.4-12.4.12-0.4.hum1@src, grafana12.4-12.4.12-0.4.hum1@x86_64

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:76677, RHSA-2026:82637
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-100350
  2. 2026-10-16 Alias added: GHSA-h4r5-mxv5-8mjc
  3. 2026-10-16 Fix available: RHSA-2026:82637 · Red Hat
  4. 2026-10-16 Fix available: RHSA-2026:76677 · Red Hat
  5. 2026-10-16 Fix available: Red Hat Hardened Images · Red Hat
  6. 2026-10-16 CVSS score added · Red Hat

References

Advisory 1

Other 4

  • TI-2026-51613 kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default CVSS 3.1CRITICAL 9.1
  • TI-2026-53976 kin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding CVSS 4.0HIGH 8.7
  • TI-2026-74664 Nil pointer panic in kin-openapi openapi3filter decoding CVSS 3.1HIGH 7.5
  • TI-2026-74663 YAML NaN and Inf values cause panic in kin-openapi validation CVSS 3.1HIGH 7.5
  • TI-2026-74661 kin-openapi nil pointer panic in openapi3filter on array schemas without items CVSS 3.1HIGH 7.5
  • TI-2026-74657 Uncontrolled recursion in kin-openapi crashes the process CVSS 3.1HIGH 7.5
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences