CVE-2026-62943

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 60% 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
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

btrbk is a tool for creating snapshots and remote backups of Btrfs subvolumes. From 0.29.0 until 0.32.7, btrbk's ssh_filter_btrbk.sh constructs allow_stream_match with a start anchor but without an end-of-string anchor for the complete command. A user restricted through an authorized_keys forced command can append a trailing pipe command after a valid btrbk command prefix, bypassing the allowlist and executing arbitrary commands with the privileges of the backup-target SSH account. Deployments that do not use ssh_filter_btrbk.sh in authorized_keys are not affected. This issue is fixed in version 0.32.7.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity87% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
Patch available. Sources: github, github_commit.
github_commit

commit 29ca3c093205 (digint/btrbk)

Fix landed in digint/btrbk commit 29ca3c093205 — awaiting tagged release

https://github.com/digint/btrbk/commit/29ca3c093205395bdeb9dd98677ab4139c458aec
github Patch Available

SSH Command Filter Bypass in ssh_filter_btrbk.sh · Advisory · digint/btrbk · GitHub

https://github.com/digint/btrbk/security/advisories/GHSA-pf45-7g54-65h5

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 12× 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. 2026-09-24 15:26 UTCEG score recompute
  2. 2026-09-24 04:27 UTCEG score recompute
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-22 19:22 UTCEG score recompute
  5. 2026-09-21 21:24 UTCEG score recompute
  6. 2026-09-21 20:58 UTCEG score recompute
  7. 2026-09-21 00:24 UTCEG score recompute
  8. 2026-09-20 20:16 UTCEPSS rescore
  9. 2026-09-20 02:26 UTCEG score recompute
  10. 2026-09-18 17:26 UTCEG score recompute
  11. 2026-09-18 16:29 UTCEG score recompute
  12. 2026-09-18 16:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-62943?
CVE-2026-62943 is a high vulnerability published on September 18, 2026. btrbk is a tool for creating snapshots and remote backups of Btrfs subvolumes. From 0.29.0 until 0.32.7, btrbk's sshfilterbtrbk.sh constructs allowstreammatch with a start anchor but without an end-of-string anchor for the complete command. A user restricted through an authorizedkeys forced command…
When was CVE-2026-62943 disclosed?
CVE-2026-62943 was first published in the National Vulnerability Database on September 18, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62943 actively exploited?
CVE-2026-62943 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 60.1% of all scored CVEs.
What is the CVSS score of CVE-2026-62943?
CVE-2026-62943 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-62943?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62943, 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

Explore the affected products and dependency analysis for CVE-2026-62943

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