CVE-2026-53508

MEDIUMPre-NVD 6.06.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 79% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

oasdiff is a command-line and Go package that compares and detects breaking changes in OpenAPI specs. From version 1.13.2 through version 1.18.0, oasdiff did not enforce --allow-external-refs=false (library: openapi3.Loader.IsExternalRefsAllowed = false) when loading a spec from a git revision (the rev:path form, e.g. main:openapi.yaml). External $refs were resolved on that load path even when external refs were explicitly disabled, so the mitigation silently did not apply there. This issue has been patched in version 1.18.1.

CVSS v3
6.0
EG Score
6.0(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity60% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

July 7, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 31, 2026
Patch available. Sources: github, github_pr.
github_pr

load: typed ExternalRefError + dedicated exit code 123

Fix merged in oasdiff/oasdiff PR #975 on 2026-05-30 — awaiting tagged release

https://github.com/oasdiff/oasdiff/pull/975
github_pr

fix: honor --allow-external-refs on the git-revision load path

Fix merged in oasdiff/oasdiff PR #974 on 2026-05-30 — awaiting tagged release

https://github.com/oasdiff/oasdiff/pull/974
github_pr

fix: resolve $ref chains via git show when loading from git revision specs

Fix merged in oasdiff/oasdiff PR #832 on 2026-04-09 — awaiting tagged release

https://github.com/oasdiff/oasdiff/pull/832
github Patch Available

oasdiff does not enforce --allow-external-refs=false on the git-revision load path (SSRF / local file read) · Advisory · oasdiff/oasdiff · GitHub

https://github.com/oasdiff/oasdiff/security/advisories/GHSA-2jcc-mxv7-p3f9

Vendor Advisories for CVE-2026-53508(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/oasdiff/oasdiff—1.18.1—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 05:48 UTCEG score recompute
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-14 07:02 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-13 08:29 UTCEG score recompute
  8. 2026-09-12 03:41 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-09 22:57 UTCEG score recompute
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-07 16:01 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-05 22:52 UTCEG score recompute
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-08-31 19:35 UTCEG score recompute
  20. 2026-08-31 18:55 UTCEG score recompute▲ 6.00
  21. 2026-08-31 18:54 UTCMITRE cvelistV5CVSS v3 → 6 · CVSS v4 → 6
  22. 2026-08-02 01:23 UTCEG score recompute
  23. 2026-07-26 12:34 UTCEG score recompute
  24. 2026-07-23 03:19 UTCEG score recompute
  25. 2026-07-08 00:12 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53508?
CVE-2026-53508 is a medium vulnerability published on July 7, 2026. oasdiff is a command-line and Go package that compares and detects breaking changes in OpenAPI specs. From version 1.13.2 through version 1.18.0, oasdiff did not enforce --allow-external-refs=false (library: openapi3.Loader.IsExternalRefsAllowed = false) when loading a spec from a git revision (the…
When was CVE-2026-53508 disclosed?
CVE-2026-53508 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53508 actively exploited?
CVE-2026-53508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.4% of all scored CVEs.
What is the CVSS score of CVE-2026-53508?
CVE-2026-53508 has a CVSS v3 base score of 6.0 (NVD).
How do I remediate CVE-2026-53508?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53508, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53508

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