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Fencer Vulns
medium 5.3

CVE-2026-100348 json

kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)

published 2026-10-15 24 d ago modified 2026-11-05 3 d ago also GHSA-mh7x-f8wq-4jhx , GO-2026-6789 , EUVD-2026-102151

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

kin-openapi is a Go project for handling OpenAPI files. Prior to 0.145.0, openapi3.Loader can dereference a nil SchemaRef.Value while resolving a self-referential additionalProperties JSON Reference such as a schema that points to its own additionalProperties member. Loading an attacker-controlled OpenAPI document through LoadFromData, LoadFromFile, or LoadFromURI reaches resolveComponent before document validation and can panic the loading process. Resolved additionalProperties schemas and ordinary recursive schemas do not take the vulnerable nil-value path. 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-2026-100348 updated cvss 5.3

github.com/getkin/kin-openapi: kin-openapi: Denial of Service via self-referential schema definitions

  • 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
none
Automatable
yes
Technical impact
partial
Assessed
24 d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

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.