CVE-2026-53507

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Source

https://cve.org/CVERecord?id=CVE-2026-53507

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53507.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-53507

Aliases

GHSA-fhj3-7267-7vv5

Published

2026-08-31T18:57:41Z

Modified

2026-10-28T02:30:21Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

oasdiff actions resolve external $refs by default, enabling SSRF and disclosure of structured files on pull-request runs

Details

oasdiff-action is a GitHub Action that detects breaking changes in OpenAPI specs and post a review on every pull request. Before version 0.0.51, the oasdiff actions resolved external $refs in the OpenAPI spec by default (allow-external-refs: true). When an action runs on a pull request whose spec is attacker-controlled — most importantly fork pull requests on public repositories — a $ref in that spec is fetched/read on the runner with no interaction required, enabling SSRF and disclosure of structured files on the runner. This issue has been patched in version 0.0.51.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1188",
        "CWE-200",
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53507.json"
}

References

Affected packages

Git / github.com/oasdiff/oasdiff-action

Affected ranges

Type

GIT

Repo

https://github.com/oasdiff/oasdiff-action

Events

Introduced

Fixed

f30668f65075c93440bd59ce2de73ce9e78751f4

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.0.51"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.0.51"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

v0.*

v0.0.1

v0.0.10

v0.0.11

v0.0.12

v0.0.13

v0.0.14

v0.0.15

v0.0.16

v0.0.17

v0.0.2

v0.0.21

v0.0.3

v0.0.30

v0.0.31

v0.0.32

v0.0.33

v0.0.34

v0.0.35

v0.0.36

v0.0.37

v0.0.38

v0.0.39

v0.0.40-beta.1

v0.0.40-beta.2

v0.0.40-beta.3

v0.0.41

v0.0.42

v0.0.43

v0.0.44

v0.0.45

v0.0.46

v0.0.47

v0.0.48

v0.0.49

v0.0.50

v0.0.6

v0.0.7

v0.0.8

v0.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53507.json"