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Fencer Vulns
medium 5.3

CVE-2026-100347 json

kin-openapi: Unauthenticated panic (DoS) in openapi3filter legacy router via non-canonical/unsupported HTTP method on a static path

published 2026-10-15 24 d ago modified 2026-11-05 3 d ago also GHSA-fh4f-47mf-f2gj , GO-2026-6783 , EUVD-2026-102156

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 44%
public exploits
0
none known

Summary

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3filter.ValidationHandler uses the routers/legacy router, which passes an unsupported or non-canonical HTTP method for an existing static path to openapi3.PathItem.GetOperation. The default branch of GetOperation panics before authentication runs, so an unauthenticated remote client can repeatedly send methods such as PROPFIND or lowercase get to abort connections and generate stack-trace log growth. The specific panic requires an exact static path; a concrete path matched only by a templated route does not reach the same sink. This issue is fixed in version 0.145.0.

Patch / fix

  • go github.com/getkin/kin-openapi 0.145.0
  • grafana13.2 hummingbird 1 13.2.3-0.3.hum1
  • hugo hummingbird 1 0.168.0-0.1.hum1
  • grafana12.4 hummingbird 1 12.4.12-0.4.hum1

red hat advisories RHSA-2026:85266RHSA-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-2026-100347 updated cvss 5.3

github.com/getkin/kin-openapi: kin-openapi: Denial of Service via unsupported HTTP methods on static paths

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-eval-hub-rhel9, rhoai/odh-mod-arch-agent-ops-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images hugo 0.168.0-0.1.hum1, grafana13.1 13.1.8-0.3.hum1, grafana13.2 13.2.3-0.3.hum1, grafana12.4 12.4.12-0.4.hum1
    fixed: vendor fix RHSA-2026:76677
  • Red Hat Hardened Images 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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/getkin/kin-openapi/security/advisories/GHSA-fh4f-47mf-f2gj 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
0.145.0

Affected products

  • getkin kin-openapi

Classification

Weakness

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.