CVE-2026-21862

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 88% 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, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

RustFS is a distributed object storage system built in Rust. Prior to version alpha.78, IP-based access control can be bypassed: get_condition_values trusts client-supplied X-Forwarded-For/X-Real-Ip without verifying a trusted proxy, so any reachable client can spoof aws:SourceIp and satisfy IP-allowlist policies. This issue has been patched in version alpha.78.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

February 3, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

SourceIp bypass via spoofed X-Forwarded-For/Real-IP headers · Advisory · rustfs/rustfs · GitHub

https://github.com/rustfs/rustfs/security/advisories/GHSA-fc6g-2gcp-2qrq

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
rustfs—1.0.0-alpha.78—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 23× 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 145 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-16 14:07 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-13 16:47 UTCEPSS rescore
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  1. 2026-08-17 13:47 UTCEPSS rescore
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  4. 2026-08-14 11:32 UTCEG score recompute
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  6. 2026-08-13 03:43 UTCEG score recompute
  7. 2026-08-12 13:50 UTCEPSS rescore
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  10. 2026-08-09 16:04 UTCEG score recompute
  11. 2026-08-09 13:46 UTCEPSS rescore
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  13. 2026-08-07 22:55 UTCEG score recompute
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  20. 2026-08-02 21:36 UTCEG score recompute
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  24. 2026-07-27 14:13 UTCEPSS rescore
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  27. 2026-07-25 14:17 UTCEPSS rescore
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  32. 2026-07-23 03:06 UTCEG score recompute
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  36. 2026-07-20 17:08 UTCEPSS rescore
  37. 2026-07-19 14:31 UTCEPSS rescore
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  41. 2026-07-18 10:04 UTCEPSS rescore
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  43. 2026-07-16 17:03 UTCEPSS rescore
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  45. 2026-07-15 16:57 UTCEPSS rescore
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  54. 2026-07-11 08:27 UTCEPSS rescore
  55. 2026-07-09 19:10 UTCEPSS rescore
  56. 2026-07-08 15:15 UTCEPSS rescore
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  58. 2026-07-07 13:46 UTCEPSS rescore
  59. 2026-07-06 16:27 UTCEPSS rescore
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  68. 2026-06-30 23:22 UTCEPSS rescore
  69. 2026-06-29 14:06 UTCEPSS rescore
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  71. 2026-06-28 04:56 UTCEPSS rescore
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  73. 2026-06-27 03:08 UTCEPSS rescore
  74. 2026-06-25 13:49 UTCEPSS rescore
  75. 2026-06-24 14:05 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-21862?
CVE-2026-21862 is a high vulnerability published on February 3, 2026. RustFS is a distributed object storage system built in Rust. Prior to version alpha.78, IP-based access control can be bypassed: getconditionvalues trusts client-supplied X-Forwarded-For/X-Real-Ip without verifying a trusted proxy, so any reachable client can spoof aws:SourceIp and satisfy…
When was CVE-2026-21862 disclosed?
CVE-2026-21862 was first published in the National Vulnerability Database on February 3, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21862 actively exploited?
CVE-2026-21862 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 87.3% of all scored CVEs.
What is the CVSS score of CVE-2026-21862?
CVE-2026-21862 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-21862?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21862, 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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