CVE-2026-55828

MEDIUMPre-NVD 6.06.0
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: secondary
Trending — 3 sources updated this week
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.

qbee transport is a remote access transport protocol implementation. Prior to 1.26.25, the extractTar routine uses strictly lexical path validation that does not account for on-disk symlinks created earlier in the extraction process. A crafted tar archive can use a symlink chain to write or overwrite files one directory level above the intended extraction path. When qbee-agent performs the extraction with root privileges, this permits a root-privileged file write outside the intended destination. This issue is fixed in version 1.26.25.

CVSS v3
6.0
EG Score
6.0(low)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

June 19, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Patch available. Sources: github, github_pr, github_commit.
github_commit Patch Available

commit 43947671ba9b (qbee-io/transport)

Patch available: qbee-io/transport v1.26.25 (contains commit 43947671ba9b)

https://github.com/qbee-io/transport/commit/43947671ba9be8fb08b105f3539a112ee7a57ddc
github_pr Patch Available

DEV-3004: Fix path traversal vulnerability in file download/upload functionality

Patch available: qbee-io/transport v1.26.25 (PR #19 merged 2026-06-15)

https://github.com/qbee-io/transport/pull/19
github Patch Available

Symlink-chain path traversal in tar extraction (one level outside destination) · Advisory · qbee-io/transport · GitHub

https://github.com/qbee-io/transport/security/advisories/GHSA-f9m7-vc86-p6jj

Vendor Advisories for CVE-2026-55828(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
go.qbee.io/transport—1.26.25—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 19:31 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-15 19:41 UTCEG score recompute
  6. 2026-09-15 18:25 UTCEG score recompute
  7. 2026-09-15 16:36 UTCEG score recompute
  8. 2026-09-15 15:24 UTCEG score recompute▲ 6.00
  9. 2026-09-15 15:22 UTCMITRE cvelistV5CVSS v3 → 6 · CVSS v4 → 6
  10. 2026-08-01 13:15 UTCEG score recompute
  11. 2026-07-26 16:47 UTCEG score recompute
  12. 2026-07-23 03:20 UTCEG score recompute
  13. 2026-06-19 21:23 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55828?
CVE-2026-55828 is a medium vulnerability published on June 19, 2026. qbee transport is a remote access transport protocol implementation. Prior to 1.26.25, the extractTar routine uses strictly lexical path validation that does not account for on-disk symlinks created earlier in the extraction process. A crafted tar archive can use a symlink chain to write or…
When was CVE-2026-55828 disclosed?
CVE-2026-55828 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55828 actively exploited?
CVE-2026-55828 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 69.3% of all scored CVEs.
What is the CVSS score of CVE-2026-55828?
CVE-2026-55828 has a CVSS v3 base score of 6.0 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-55828?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55828, 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-2026-55828

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