CVE-2026-53507

See a problem?
Please try reporting it to the source first.
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
2026-08-31T18:57:41.097Z
Modified
2026-09-03T03:30:38.175364943Z
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 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53507.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1188",
        "CWE-200",
        "CWE-918"
    ]
}
References

Affected packages

Git / github.com/oasdiff/oasdiff-action

Affected ranges

Type
GIT
Repo
https://github.com/oasdiff/oasdiff-action
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f30668f65075c93440bd59ce2de73ce9e78751f4
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.0.51"
        }
    ]
}

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"