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CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-100351: kin-openapi: ValidationHandler security-requirement bypass via encoded-path operation confusion

HighCVSS 7.4 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 29/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: getkin kin-openapi 0.147.0.

Low priority for now. Upgrade to getkin kin-openapi 0.147.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

kin-openapi is a Go project for handling OpenAPI files. From 0.144.0 until 0.147.0, openapi3filter.ValidationHandler validates an operation selected from decoded URL.Path while a downstream gorilla/mux router configured with UseEncodedPath can dispatch a different operation selected from URL.RawPath. When a public exact route and a protected parameterized route use the same method and overlap after decoding, an unauthenticated remote request containing an encoded path separator can be validated as public and then dispatched to the protected handler without invoking the configured AuthenticationFunc. The reachable path parameter is constrained to an encoded representation that decodes to the public literal route, and proxies that canonicalize the URI before forwarding prevent this specific mismatch. This issue is fixed in version 0.147.0.

Published
Oct 15, 2026
Updated
Oct 15, 2026
EPSS
0.4% · 42th percentile

Report tools

JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.4
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • getkin kin-openapi

    • >= 0.144.0, < 0.147.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/getkin/kin-openapifrom 0.144.0 · before 0.147.00.147.0
openSUSE:Tumbleweedhugobefore 0.168.0-2.10.168.0-2.1
openSUSE:Tumbleweedtimonibefore 0.36.0-1.10.36.0-1.1
Red Hat:hummingbird:1grafana12.4before 0:12.4.12-0.4.hum10:12.4.12-0.4.hum1
Red Hat:hummingbird:1grafana13.2before 0:13.2.3-0.3.hum10:13.2.3-0.3.hum1
Red Hat:hummingbird:1hugobefore 0:0.168.0-0.1.hum10:0.168.0-0.1.hum1

Same product

getkin: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-73501kin-openapi: ValidationHandler.Load() Fail-Open Authentication Bypass via NoopAuthenticationFunc Default
    36Monitor
  • CVE-2026-77354kin-openapi: Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding
    34Monitor
  • CVE-2026-100349kin-openapi openapi3filter: nil-pointer panic in ValidateResponse on a response header declared with content
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-100348Oct 15, 2026 · kin-openapi spec loader panics on a self-referential additionalProperties $ref (nil-pointer DoS)
    21Monitor
  • ← EarlierCVE-2026-100350Oct 15, 2026 · kin-openapi deepObject query decoding repeatedly compiles an invariant regular expression
    21Monitor
  • Later →CVE-2026-100352Oct 15, 2026 · kin-openapi: YAML NaN/Inf Values Bypass Built-in Guards and Panic via OAS 3.1 Validation Path
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
getkin kin-openapi0.147.0 · descriptionVendor (CNA)
Go:github.com/getkin/kin-openapi0.147.0Package registry (OSV)
opensuse:hugo0.168.0-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:timoni0.36.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:grafana12.40:12.4.12-0.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:grafana13.20:13.2.3-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:hugo0:0.168.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 12, 2026+28 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-289 · Authentication Bypass by Alternate Name

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → poc
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records