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Fencer Vulns
medium 5.3

CVE-2026-100350 json

kin-openapi deepObject query decoding repeatedly compiles an invariant regular expression

published 2026-10-15 24 d ago modified 2026-11-05 3 d ago also GHSA-h4r5-mxv5-8mjc , GO-2026-6787 , EUVD-2026-102158

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/getkin/kin-openapi 0.146.0
  • hugo hummingbird 1 0.168.0-0.1.hum1
  • grafana12.4 hummingbird 1 12.4.12-0.4.hum1

red hat advisories RHSA-2026:82637RHSA-2026:76677

  • hugo openSUSE Tumbleweed 0.168.0-2.1

opensuse advisories openSUSE-SU-2026:12164-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-100350 updated cvss 5.3

github.com/getkin/kin-openapi: kin-openapi: Denial of Service via redundant regular expression compilation in query parameter decoding

  • Red Hat Hardened Images hugo 0.168.0-0.1.hum1, grafana12.4 12.4.12-0.4.hum1
    fixed: vendor fix RHSA-2026:76677
  • Red Hat Hardened Images grafana13.1 13.1.7-0.1.hum1, grafana13.2 13.2.3-0.1.hum1, go-fdo-server 1.0.2-1.1.hum1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
24 d ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/getkin/kin-openapi/security/advisories/GHSA-h4r5-mxv5-8mjc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/getkin/kin-openapi
>=0.145.0, <0.146.0
0.146.0

Affected products

  • getkin kin-openapi

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-1050 Excessive Platform Resource Consumption within a Loop

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.