CVE-2026-53508Network attack vector

SSRF and file reads via ignored reference policy

Published Aug 31, 2026 · Updated Aug 31, 2026

SSRF and local file reads in oasdiff 1.13.2 through 1.18.0 allow context-dependent attackers to access protected resources via untrusted specs. The git-revision branch of load.NewSpecInfo resolves external $ref targets without applying Loader.IsExternalRefsAllowed=false, unlike file and URL paths. Exposure requires explicitly disabling external references and processing an attacker-controlled spec; successful references can fetch internal URLs or readable local files.

CVSS severity6.0
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF and local file reads in oasdiff 1.13.2 through 1.18.0 allow context-dependent attackers to access protected resources via untrusted specs. The git-revision branch of load.NewSpecInfo resolves external $ref targets without applying Loader.IsExternalRefsAllowed=false, unlike file and URL paths. Exposure requires explicitly disabling external references and processing an attacker-controlled spec; successful references can fetch internal URLs or readable local files.

The record

CVE
CVE-2026-53508
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
oasdiff
Product
oasdiff
Classifications
CWE-693, CWE-73, CWE-918, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.13.2, < 1.18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

oasdiff · oasdiffversion=>= 1.13.2, < 1.18.1

Published CVSS scores

6.0GitHub CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-73External Control of File Name or Path
CWE-918Server-Side Request Forgery (SSRF)
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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