CVE-2018-0502

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

An issue was discovered in zsh before 5.6. The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
83%
KEV
Not listed

Published

September 5, 2018

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 21, 2026
Patch available.
generic

zsh / Code / Commit [1c4c7b]

https://sourceforge.net/p/zsh/code/ci/1c4c7b6a4d17294df028322b70c53803a402233d
generic

Zsh: User-assisted execution of arbitrary code (GLSA 201903-02) — Gentoo security

https://security.gentoo.org/glsa/201903-02
generic Patch Available

[SECURITY] [DLA 2470-1] zsh security update

https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html
generic Patch Available

#908000 - zsh: CVE-2018-0502 + CVE-2018-13259: Two security bugs in shebang line parsing - Debian Bug report logs

https://bugs.debian.org/908000
generic
https://www.zsh.org/mla/zsh-announce/136

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzsh-static (5.1.1-1ubuntu2.3) @ xenial2026-05-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
zsh—5.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
zsh—5.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
zsh—5.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
zsh—5.6-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
zsh5.3.1-45.3.1-4+deb9u1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× 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 122 total refreshes for this CVE.

  1. 2026-08-19 16:59 UTCEPSS rescore
  2. 2026-08-18 13:43 UTCEPSS rescore
  3. 2026-08-16 14:51 UTCEPSS rescore
  4. 2026-08-16 02:10 UTCEPSS rescore
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  12. 2026-08-06 13:15 UTCOSV refresh
  13. 2026-08-05 19:13 UTCEPSS rescore
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  20. 2026-07-26 14:51 UTCEPSS rescore
  21. 2026-07-26 14:51 UTCEPSS rescore
  22. 2026-07-23 14:15 UTCEPSS rescore
  23. 2026-07-23 01:31 UTCEG score recompute
  24. 2026-07-22 22:11 UTCEG score recompute
  25. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-21 15:21 UTCEPSS rescore
  2. 2026-07-21 06:18 UTCOSV refresh
  3. 2026-07-20 17:04 UTCEPSS rescore
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  5. 2026-07-19 14:28 UTCEPSS rescore
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  7. 2026-07-19 02:26 UTCEPSS rescore
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  9. 2026-07-18 10:01 UTCEPSS rescore
  10. 2026-07-16 16:59 UTCEPSS rescore
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  12. 2026-07-15 16:55 UTCEPSS rescore
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  18. 2026-07-12 05:43 UTCEPSS rescore
  19. 2026-07-11 08:24 UTCEPSS rescore
  20. 2026-07-09 19:06 UTCEPSS rescore
  21. 2026-07-08 15:11 UTCEPSS rescore
  22. 2026-07-07 13:42 UTCEPSS rescore
  23. 2026-07-06 16:24 UTCEPSS rescore
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  25. 2026-07-06 02:20 UTCEPSS rescore
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  27. 2026-07-05 02:27 UTCEPSS rescore
  28. 2026-07-04 06:28 UTCEPSS rescore
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  30. 2026-07-04 01:56 UTCOSV refresh
  31. 2026-07-02 16:54 UTCEPSS rescore
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  33. 2026-06-30 23:19 UTCEPSS rescore
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  40. 2026-06-25 13:47 UTCEPSS rescore
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  43. 2026-06-23 21:30 UTCEPSS rescore
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  45. 2026-06-22 14:23 UTCEPSS rescore
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  47. 2026-06-21 14:54 UTCEPSS rescore
  48. 2026-06-21 14:54 UTCEPSS rescore
  49. 2026-06-21 01:57 UTCEPSS rescore
  50. 2026-06-21 01:57 UTCEPSS rescore
  51. 2026-06-19 19:23 UTCEPSS rescore
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  53. 2026-06-18 17:50 UTCEPSS rescore
  54. 2026-06-17 17:50 UTCEPSS rescore
  55. 2026-06-16 17:50 UTCEPSS rescore
  56. 2026-06-15 17:45 UTCEPSS rescore
  57. 2026-06-15 13:43 UTCOSV refresh
  58. 2026-06-14 23:14 UTCEPSS rescore
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  65. 2026-06-10 22:15 UTCEPSS rescore
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  69. 2026-06-07 15:22 UTCEPSS rescore
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  75. 2026-06-05 06:08 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-0502?
CVE-2018-0502 is a critical vulnerability published on September 5, 2018. An issue was discovered in zsh before 5.6. The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line.
When was CVE-2018-0502 disclosed?
CVE-2018-0502 was first published in the National Vulnerability Database on September 5, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0502 actively exploited?
CVE-2018-0502 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 16.6% of all scored CVEs.
What is the CVSS score of CVE-2018-0502?
CVE-2018-0502 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-0502?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0502, 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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