CVE-2026-73055

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-16. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

Shescape before 2.1.15 (and 3.0.0 before 3.0.2) fails to properly escape tilde (~) characters in assignment contexts on Unix systems where the shell is explicitly configured to "sh" or true and /bin/sh points to BusyBox. Using the escape and escapeAll APIs with untrusted input in an assignment prefixed to a command, an attacker can inject a tilde payload to disclose the user's home directory location and, depending on usage, alter the location on which a command operates.

CVSS v3
4.8
EG Score
4.8(high)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Aug 15, 2026
Patch available. Sources: github, github_commit.
generic

Shescape before 2.1.15 Home Directory Disclosure via BusyBox | Advisories | VulnCheck

https://www.vulncheck.com/advisories/shescape-before-home-directory-disclosure-via-busybox
github_commit Patch Available

commit 7cba30594c16 (ericcornelissen/shescape)

Patch available: ericcornelissen/shescape v2.1.15 (contains commit 7cba30594c16)

https://github.com/ericcornelissen/shescape/commit/7cba30594c16a21524706efe2f6c6c9d8923f411
github_commit Patch Available

commit d86bf2ae2296 (ericcornelissen/shescape)

Patch available: ericcornelissen/shescape v3.0.2 (contains commit d86bf2ae2296)

https://github.com/ericcornelissen/shescape/commit/d86bf2ae22961c73458bddf70dd06adf9dadb36c
github Patch Available

Home-directory disclosure in assignment context on Unix with BusyBox · Advisory · ericcornelissen/shescape · GitHub

https://github.com/ericcornelissen/shescape/security/advisories/GHSA-j44h-fqhh-fh28

Vendor Advisories for CVE-2026-73055(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 20× in last 7d / 20× 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. 2026-08-20 23:16 UTCEG score recompute
  2. 2026-08-20 23:16 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-19 20:59 UTCEG score recompute
  5. 2026-08-19 20:59 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-18 18:42 UTCEG score recompute
  8. 2026-08-18 18:42 UTCGHSA enrichment
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 13:49 UTCEPSS rescore
  11. 2026-08-17 16:24 UTCEG score recompute
  12. 2026-08-17 16:24 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 00:46 UTCEG score recompute
  15. 2026-08-17 00:46 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-15 22:29 UTCEG score recompute
  19. 2026-08-15 21:53 UTCEG score recompute
  20. 2026-08-15 21:52 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-73055?
CVE-2026-73055 is a medium vulnerability published on August 15, 2026. Shescape before 2.1.15 (and 3.0.0 before 3.0.2) fails to properly escape tilde (~) characters in assignment contexts on Unix systems where the shell is explicitly configured to "sh" or true and /bin/sh points to BusyBox. Using the escape and escapeAll APIs with untrusted input in an assignment…
When was CVE-2026-73055 disclosed?
CVE-2026-73055 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73055 actively exploited?
CVE-2026-73055 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 88.9% of all scored CVEs.
What is the CVSS score of CVE-2026-73055?
CVE-2026-73055 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-73055?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73055, 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-2026-73055

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