CVE-2026-56316

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-21. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

Cap-go before 12.128.2 contains an information disclosure vulnerability in the OPTIONS /build/upload/:jobId/* endpoint that allows unauthenticated attackers to enumerate valid builder job IDs through observable response discrepancies. Attackers can probe the endpoint without authentication to distinguish valid job IDs from invalid ones and generate sustained unauthenticated traffic for resource consumption.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
33.4%
KEV
Not listed

Published

June 21, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/* | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cap-go-job-existence-oracle-via-unauthenticated-options-build-upload-jobid
github Patch Available🟡 PoC Available

Unauthenticated native-build TUS OPTIONS /build/upload/:jobId/* acts as job existence oracle (and enables unauthenticated resource consumption) · Advisory · Cap-go/capgo · GitHub

https://github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm

Vendor Advisories for CVE-2026-56316(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 65× 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. 2026-07-24 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:20 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-21 15:25 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-19 14:31 UTCEPSS rescore
  8. 2026-07-19 14:31 UTCEPSS rescore
  9. 2026-07-19 02:29 UTCEPSS rescore
  10. 2026-07-18 10:04 UTCEPSS rescore
  11. 2026-07-16 17:03 UTCEPSS rescore
  12. 2026-07-16 13:36 UTCGHSA enrichment
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-15 12:32 UTCGHSA enrichment
  16. 2026-07-15 02:00 UTCEPSS rescore
  17. 2026-07-15 02:00 UTCEPSS rescore
  18. 2026-07-14 11:42 UTCGHSA enrichment
  19. 2026-07-13 22:31 UTCEPSS rescore
  20. 2026-07-13 10:51 UTCGHSA enrichment
  21. 2026-07-13 06:13 UTCEPSS rescore
  22. 2026-07-13 06:13 UTCEPSS rescore
  23. 2026-07-12 10:01 UTCGHSA enrichment
  24. 2026-07-12 05:46 UTCEPSS rescore
  25. 2026-07-11 09:11 UTCGHSA enrichment
Show 49 more
  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-10 08:21 UTCGHSA enrichment
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-09 19:10 UTCEPSS rescore
  6. 2026-07-09 07:28 UTCGHSA enrichment
  7. 2026-07-08 15:16 UTCEPSS rescore
  8. 2026-07-08 15:16 UTCEPSS rescore
  9. 2026-07-08 06:37 UTCGHSA enrichment
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-07 13:46 UTCEPSS rescore
  12. 2026-07-07 05:47 UTCGHSA enrichment
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 04:56 UTCGHSA enrichment
  16. 2026-07-06 02:23 UTCEPSS rescore
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-05 04:03 UTCGHSA enrichment
  19. 2026-07-05 02:31 UTCEPSS rescore
  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-04 03:01 UTCGHSA enrichment
  24. 2026-07-03 02:02 UTCGHSA enrichment
  25. 2026-07-02 01:11 UTCGHSA enrichment
  26. 2026-07-01 15:07 UTCEPSS rescore
  27. 2026-07-01 00:20 UTCGHSA enrichment
  28. 2026-06-30 23:22 UTCEPSS rescore
  29. 2026-06-29 23:30 UTCGHSA enrichment
  30. 2026-06-29 14:06 UTCEPSS rescore
  31. 2026-06-29 14:06 UTCEPSS rescore
  32. 2026-06-28 22:40 UTCGHSA enrichment
  33. 2026-06-28 14:07 UTCEPSS rescore
  34. 2026-06-28 04:56 UTCEPSS rescore
  35. 2026-06-28 04:56 UTCEPSS rescore
  36. 2026-06-27 21:50 UTCGHSA enrichment
  37. 2026-06-27 03:08 UTCEPSS rescore
  38. 2026-06-26 21:00 UTCGHSA enrichment
  39. 2026-06-25 20:11 UTCGHSA enrichment
  40. 2026-06-25 13:49 UTCEPSS rescore
  41. 2026-06-24 19:21 UTCGHSA enrichment
  42. 2026-06-24 14:05 UTCEPSS rescore
  43. 2026-06-23 21:33 UTCEPSS rescore
  44. 2026-06-23 21:33 UTCEPSS rescore
  45. 2026-06-23 17:25 UTCGHSA enrichment
  46. 2026-06-22 19:39 UTCNVD updateCVSS v4 → 6.9
  47. 2026-06-22 16:30 UTCGHSA enrichment
  48. 2026-06-21 15:38 UTCEG score recompute
  49. 2026-06-21 15:38 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-56316?
CVE-2026-56316 is a medium vulnerability published on June 21, 2026. Cap-go before 12.128.2 contains an information disclosure vulnerability in the OPTIONS /build/upload/:jobId/* endpoint that allows unauthenticated attackers to enumerate valid builder job IDs through observable response discrepancies. Attackers can probe the endpoint without authentication to…
When was CVE-2026-56316 disclosed?
CVE-2026-56316 was first published in the National Vulnerability Database on June 21, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56316 actively exploited?
CVE-2026-56316 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56316?
CVE-2026-56316 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-56316?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56316, 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

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