CVE-2026-9277

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 44% 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 weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

shell-quote's quote() function did not validate object-token inputs against the operator model used by parse(). The .op field was backslash-escaped character by character using /(.)/g, which in JavaScript does not match line terminators (\n, \r, U+2028, U+2029). A line terminator in .op therefore passed through unescaped into the output; POSIX shells treat a literal newline as a command separator, so any content after it would execute as a second command. The vulnerable code path is reachable in two ways: (1) direct construction of { op: '...\n...' } from external input, and (2) via parse(cmd, envFn) when envFn returns object tokens whose .op is attacker-influenced. Both are documented API surface. Fixed by replacing the per-character escape with strict shape validation: .op must match the parser's control-operator allowlist; { op: 'glob', pattern } validates pattern and forbids line terminators; { comment } validates comment and forbids line terminators; any other object shape throws TypeError.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

May 22, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Jun 3, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

shell-quote quote() does not escape newlines in object .op values · Advisory · ljharb/shell-quote · GitHub

https://github.com/ljharb/shell-quote/security/advisories/GHSA-w7jw-789q-3m8p
generic🟡 PoC Available

oss-security - CVE-2026-9277: shell-quote before 1.8.4 command injection in quote()

http://www.openwall.com/lists/oss-security/2026/05/23/2
generic

GitHub - ljharb/shell-quote · GitHub

https://github.com/ljharb/shell-quote

Vendor Advisories for CVE-2026-9277(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift4/ose-console:17882186692026-09-11redhat
redhatopenshift4/ose-console-rhel9:17876313822026-09-03redhat
redhatdevspaces/code-rhel9:17877627932026-09-01redhat
redhatopenshift4/ose-console-rhel9:17870541592026-08-26redhat
redhatopenshift4/ose-console:17870285592026-08-26redhat
redhatansible-automation-platform/automation-portal:17858542262026-08-05redhat
redhatopenshift4/ose-console-rhel9:17852785692026-08-05redhat
redhatopenshift4/ose-agent-installer-ui-rhel9:17847246992026-07-28redhat
redhatopenshift4/ose-agent-installer-ui-rhel9:17847137412026-07-28redhat
redhatopenshift4/ose-agent-installer-ui-rhel9:17847215812026-07-28redhat
redhatopenshift4/ose-console-rhel9:17837181572026-07-22redhat
redhatquay/quay-rhel8:17843519662026-07-21redhat
redhatrhmtc/openshift-migration-ui-rhel8:17836905322026-07-20redhat
redhatquay/quay-rhel9:17839558462026-07-16redhat
redhatrhdh/rhdh-hub-rhel9:17834481842026-07-08redhat
redhatopenshift4/ose-console-rhel9:17829117112026-07-07redhat
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-rhel9:17828394942026-07-01redhat
redhatopenshift4/ose-console-rhel9:17823086752026-06-30redhat
redhatopenshift4/ose-console-rhel9:17822243902026-06-30redhat
redhatquay/quay-rhel8:17824877172026-06-30redhat
redhatrhdh/rhdh-hub-rhel9:17827612442026-06-30redhat
redhatquay/quay-rhel8:17819373572026-06-25redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatquay/quay-rhel8:17818780702026-06-23redhat
redhatcryostat/cryostat-openshift-console-plugin-rhel9:4.2.0-102026-06-22redhat
redhatsatellite/iop-vulnerability-frontend-rhel9:17810324952026-06-16redhat
redhatrhdh/rhdh-hub-rhel9:17811873422026-06-16redhat
redhatopenshift-service-mesh/kiali-rhel9:17809164782026-06-15redhat
redhatopenshift-service-mesh/kiali-rhel9:17809163452026-06-15redhat
redhatopenshift-service-mesh/kiali-rhel8:17809165362026-06-15redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-shell-quote1.7.4+~1.7.1-11.7.4+~1.7.1-1+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-shell-quote1.7.4+~1.7.1-11.7.4+~1.7.1-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-shell-quote1.7.4+~1.7.1-1, 1.7.4+~1.7.1-2, 1.8.3+~1.7.5-11.8.4+~1.7.5-1—
npm(1)
PackageVulnerable rangeFixed inDependents
shell-quote—1.8.4—

Weakness Classification(2)

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

Additional Vendor Advisories

(12)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 77× 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 278 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-16 14:09 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 13:39 UTCEG score recompute
  7. 2026-09-14 13:39 UTCVendor advisory
  8. 2026-09-14 12:35 UTCEG score recompute
  9. 2026-09-14 12:35 UTCVendor advisory
  10. 2026-09-13 16:48 UTCEPSS rescore
  11. 2026-09-12 15:02 UTCEPSS rescore
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 09:38 UTCEPSS rescore
  14. 2026-09-10 13:38 UTCEG score recompute
  15. 2026-09-10 13:38 UTCVendor advisory
  16. 2026-09-10 12:26 UTCEG score recompute
  17. 2026-09-10 12:26 UTCVendor advisory
  18. 2026-09-10 09:35 UTCEPSS rescore
  19. 2026-09-09 13:41 UTCEG score recompute
  20. 2026-09-09 13:41 UTCVendor advisory
  21. 2026-09-09 12:38 UTCEG score recompute
  22. 2026-09-09 12:38 UTCVendor advisory
  23. 2026-09-08 22:01 UTCEPSS rescore
  24. 2026-09-07 13:50 UTCEG score recompute
  25. 2026-09-07 13:50 UTCVendor advisory
Show 75 more
  1. 2026-09-07 12:38 UTCEG score recompute
  2. 2026-09-07 12:38 UTCVendor advisory
  3. 2026-09-06 13:48 UTCEPSS rescore
  4. 2026-09-05 15:31 UTCEPSS rescore
  5. 2026-09-04 13:29 UTCEG score recompute
  6. 2026-09-04 13:29 UTCVendor advisory
  7. 2026-09-04 12:21 UTCEG score recompute
  8. 2026-09-04 12:21 UTCVendor advisory
  9. 2026-09-04 05:07 UTCEPSS rescore
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-02 13:41 UTCEG score recompute
  12. 2026-09-02 13:41 UTCVendor advisory
  13. 2026-09-02 12:38 UTCEG score recompute
  14. 2026-09-02 12:38 UTCVendor advisory
  15. 2026-09-01 13:54 UTCEPSS rescore
  16. 2026-09-01 04:40 UTCEPSS rescore
  17. 2026-08-31 13:33 UTCEG score recompute
  18. 2026-08-31 13:33 UTCVendor advisory
  19. 2026-08-31 12:30 UTCEG score recompute
  20. 2026-08-31 12:30 UTCVendor advisory
  21. 2026-08-30 19:18 UTCEPSS rescore
  22. 2026-08-30 01:22 UTCEPSS rescore
  23. 2026-08-28 21:42 UTCEPSS rescore
  24. 2026-08-27 14:25 UTCEPSS rescore
  25. 2026-08-27 13:35 UTCEG score recompute
  26. 2026-08-27 13:35 UTCVendor advisory
  27. 2026-08-27 13:02 UTCEG score recompute
  28. 2026-08-27 13:02 UTCVendor advisory
  29. 2026-08-26 16:24 UTCEG score recompute
  30. 2026-08-26 16:24 UTCVendor advisory
  31. 2026-08-26 14:47 UTCEPSS rescore
  32. 2026-08-26 12:20 UTCEG score recompute
  33. 2026-08-26 12:20 UTCVendor advisory
  34. 2026-08-25 13:49 UTCEPSS rescore
  35. 2026-08-25 13:23 UTCEG score recompute
  36. 2026-08-25 13:23 UTCVendor advisory
  37. 2026-08-25 12:20 UTCEG score recompute
  38. 2026-08-25 12:20 UTCVendor advisory
  39. 2026-08-24 14:18 UTCEPSS rescore
  40. 2026-08-24 13:29 UTCEG score recompute
  41. 2026-08-24 13:29 UTCVendor advisory
  42. 2026-08-24 12:25 UTCEG score recompute
  43. 2026-08-24 12:25 UTCVendor advisory
  44. 2026-08-23 16:42 UTCEG score recompute
  45. 2026-08-23 16:42 UTCVendor advisory
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-21 23:49 UTCEPSS rescore
  48. 2026-08-21 21:41 UTCEG score recompute
  49. 2026-08-21 21:41 UTCVendor advisory
  50. 2026-08-20 22:56 UTCEPSS rescore
  51. 2026-08-20 18:39 UTCEG score recompute
  52. 2026-08-20 18:39 UTCVendor advisory
  53. 2026-08-19 17:04 UTCEPSS rescore
  54. 2026-08-19 12:26 UTCEG score recompute
  55. 2026-08-19 12:26 UTCVendor advisory
  56. 2026-08-19 12:11 UTCEG score recompute
  57. 2026-08-19 12:11 UTCVendor advisory
  58. 2026-08-18 13:49 UTCEPSS rescore
  59. 2026-08-18 12:39 UTCEG score recompute
  60. 2026-08-18 12:39 UTCVendor advisory
  61. 2026-08-18 12:17 UTCEG score recompute
  62. 2026-08-18 12:17 UTCVendor advisory
  63. 2026-08-17 13:47 UTCEPSS rescore
  64. 2026-08-17 12:26 UTCEG score recompute
  65. 2026-08-17 12:26 UTCVendor advisory
  66. 2026-08-17 12:12 UTCEG score recompute
  67. 2026-08-17 12:12 UTCVendor advisory
  68. 2026-08-17 09:44 UTCVendor advisory
  69. 2026-08-16 16:48 UTCEG score recompute
  70. 2026-08-16 16:48 UTCVendor advisory
  71. 2026-08-16 14:56 UTCEPSS rescore
  72. 2026-08-16 14:56 UTCEPSS rescore
  73. 2026-08-16 03:20 UTCEG score recompute
  74. 2026-08-16 03:20 UTCVendor advisory
  75. 2026-08-16 02:15 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Frequently asked(5)

What is CVE-2026-9277?
CVE-2026-9277 is a high vulnerability published on May 22, 2026. shell-quote's quote() function did not validate object-token inputs against the operator model used by parse(). The .op field was backslash-escaped character by character using /(.)/g, which in JavaScript does not match line terminators (\n, \r, U+2028, U+2029). A line terminator in .op therefore…
When was CVE-2026-9277 disclosed?
CVE-2026-9277 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9277 actively exploited?
CVE-2026-9277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.5% of all scored CVEs.
What is the CVSS score of CVE-2026-9277?
CVE-2026-9277 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-9277?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9277, 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-2026-9277

Explore →

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