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
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 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
29(Track)
EG Risk 29/100SSVC: 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 PROB
0%
EPSS %ILE
35%
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 8× in last 7d / 35× 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.

Showing the most recent 100 of 176 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:31 UTCEPSS rescore
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:11 UTCEPSS rescore
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-13 12:52 UTCEG score recompute
  8. 2026-09-13 12:52 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-07 16:01 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:54 UTCEPSS rescore
  17. 2026-09-01 04:40 UTCEPSS rescore
  18. 2026-08-30 20:42 UTCEG score recompute
  19. 2026-08-30 20:42 UTCGHSA enrichment
  20. 2026-08-30 19:17 UTCEPSS rescore
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:41 UTCEPSS rescore
  23. 2026-08-27 14:25 UTCEPSS rescore
  24. 2026-08-26 14:46 UTCEPSS rescore
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-25 00:46 UTCEG score recompute
  2. 2026-08-25 00:46 UTCGHSA enrichment
  3. 2026-08-23 23:45 UTCEG score recompute
  4. 2026-08-23 23:45 UTCGHSA enrichment
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-22 22:56 UTCEG score recompute
  7. 2026-08-22 22:56 UTCGHSA enrichment
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 08:43 UTCEG score recompute
  10. 2026-08-21 08:43 UTCGHSA enrichment
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-20 07:53 UTCEG score recompute
  13. 2026-08-20 07:53 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 05:47 UTCEG score recompute
  16. 2026-08-19 05:47 UTCGHSA enrichment
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 02:46 UTCEG score recompute
  20. 2026-08-17 02:46 UTCGHSA enrichment
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-16 01:56 UTCEG score recompute
  24. 2026-08-16 01:56 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-15 01:06 UTCGHSA enrichment
  27. 2026-08-14 00:17 UTCEG score recompute
  28. 2026-08-14 00:17 UTCGHSA enrichment
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-12 23:27 UTCEG score recompute
  31. 2026-08-12 23:27 UTCGHSA enrichment
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-11 22:37 UTCEG score recompute
  34. 2026-08-11 22:37 UTCGHSA enrichment
  35. 2026-08-11 00:00 UTCEPSS rescore
  36. 2026-08-10 21:48 UTCGHSA enrichment
  37. 2026-08-09 20:58 UTCEG score recompute
  38. 2026-08-09 20:58 UTCGHSA enrichment
  39. 2026-08-09 13:46 UTCEPSS rescore
  40. 2026-08-08 20:09 UTCEG score recompute
  41. 2026-08-08 20:09 UTCGHSA enrichment
  42. 2026-08-08 16:37 UTCEPSS rescore
  43. 2026-08-07 19:19 UTCEG score recompute
  44. 2026-08-07 19:19 UTCGHSA enrichment
  45. 2026-08-06 18:30 UTCEG score recompute
  46. 2026-08-06 18:30 UTCGHSA enrichment
  47. 2026-08-06 13:47 UTCEPSS rescore
  48. 2026-08-05 19:17 UTCEPSS rescore
  49. 2026-08-05 17:40 UTCGHSA enrichment
  50. 2026-08-04 15:17 UTCEG score recompute
  51. 2026-08-04 15:17 UTCGHSA enrichment
  52. 2026-08-04 15:10 UTCEPSS rescore
  53. 2026-08-04 10:39 UTCEPSS rescore
  54. 2026-08-03 10:36 UTCEPSS rescore
  55. 2026-08-03 08:00 UTCGHSA enrichment
  56. 2026-08-02 05:46 UTCEG score recompute
  57. 2026-08-02 05:46 UTCGHSA enrichment
  58. 2026-08-02 02:27 UTCEPSS rescore
  59. 2026-08-01 04:56 UTCEG score recompute
  60. 2026-08-01 04:56 UTCGHSA enrichment
  61. 2026-08-01 04:16 UTCEPSS rescore
  62. 2026-07-31 03:46 UTCEG score recompute
  63. 2026-07-31 03:45 UTCGHSA enrichment
  64. 2026-07-30 16:28 UTCEPSS rescore
  65. 2026-07-30 02:49 UTCEG score recompute
  66. 2026-07-30 02:49 UTCGHSA enrichment
  67. 2026-07-30 01:30 UTCEPSS rescore
  68. 2026-07-30 01:30 UTCEPSS rescore
  69. 2026-07-29 01:27 UTCEG score recompute
  70. 2026-07-29 01:27 UTCGHSA enrichment
  71. 2026-07-28 15:37 UTCEPSS rescore
  72. 2026-07-27 18:00 UTCEG score recompute
  73. 2026-07-27 18:00 UTCGHSA enrichment
  74. 2026-07-26 16:18 UTCEG score recompute
  75. 2026-07-26 16:18 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 0% probability of exploitation in the next 30 days, which ranks it in the top 65.1% of all scored CVEs.
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.

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