CVE-2026-9277 (GCVE-0-2026-9277)

Vulnerability from cvelistv5 – Published: 2026-05-22 13:22 – Updated: 2026-07-02 12:05
VLAI
Title
shell-quote `quote()` does not validate object-token shapes, allowing command injection via line terminators in `.op`
Summary
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`.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
URL Tags
https://github.com/ljharb/shell-quote/security/ad… vendor-advisory
https://github.com/ljharb/shell-quote/commit/1518179 patch
https://github.com/ljharb/shell-quote product
https://www.npmjs.com/package/shell-quote product
http://www.openwall.com/lists/oss-security/2026/05/23/2
https://access.redhat.com/security/cve/CVE-2026-9277 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480741 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:28010 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34342 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33574 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26234 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29834 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29795 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26072 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26080 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26077 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26079 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26090 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33683 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30076 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28571 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26225 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
shell-quote Affected: 1.1.0 , < 1.8.4 (semver)
Red Hat Cryostat 4 on RHEL 9     cpe:/a:redhat:cryostat:4::el9
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Red Hat Cluster Observability Operator 1.5.0     cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat Discovery 2     cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat OpenShift Container Platform 4.21     cpe:/a:redhat:openshift:4.21::el9
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Red Hat Red Hat OpenShift Container Platform 4.22     cpe:/a:redhat:openshift:4.22::el9
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Red Hat Red Hat OpenShift Service Mesh 2.6     cpe:/a:redhat:service_mesh:2.6::el8
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Red Hat Red Hat OpenShift Service Mesh 3.0     cpe:/a:redhat:service_mesh:3.0::el9
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Red Hat Red Hat OpenShift Service Mesh 3.1     cpe:/a:redhat:service_mesh:3.1::el9
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Red Hat Red Hat OpenShift Service Mesh 3.2     cpe:/a:redhat:service_mesh:3.2::el9
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Red Hat Red Hat OpenShift Service Mesh 3.3     cpe:/a:redhat:service_mesh:3.3::el9
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Red Hat Red Hat Quay 3.10     cpe:/a:redhat:quay:3.10::el8
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Red Hat Red Hat Quay 3.12     cpe:/a:redhat:quay:3.12::el8
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Red Hat Red Hat Quay 3.9     cpe:/a:redhat:quay:3.9::el8
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Red Hat Red Hat Satellite 6.18     cpe:/a:redhat:satellite:6.18::el9
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Red Hat Migration Toolkit for Containers     cpe:/a:redhat:rhmt:1
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Build of Podman Desktop     cpe:/a:redhat:podman_desktop:1
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Red Hat Red Hat Build of Podman Desktop - Tech Preview     cpe:/a:redhat:podman_desktop:0
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3     cpe:/a:redhat:enterprise_linux_ai:3
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Gatekeeper 3     cpe:/a:redhat:gatekeeper:3
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Red Hat Node HealthCheck Operator     cpe:/a:redhat:workload_availability_nhc:0
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Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
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Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Trusted Artifact Signer     cpe:/a:redhat:trusted_artifact_signer:1
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Credits
Akshat Sinha (@akshatgit) Jordan Harband (@ljharb)
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Fixed by replacing the per-character escape with strict shape validation: `.op` must match the parser\u0027s control-operator allowlist; `{ op: \u0027glob\u0027, pattern }` validates `pattern` and forbids line terminators; `{ comment }` validates `comment` and forbids line terminators; any other object shape throws `TypeError`.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eshell-quote\u0027s `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. 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Fixed by replacing the per-character escape with strict shape validation: `.op` must match the parser\u0027s control-operator allowlist; `{ op: \u0027glob\u0027, pattern }` validates `pattern` and forbids line terminators; `{ comment }` validates `comment` and forbids line terminators; any other object shape throws `TypeError`.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-78\", \"description\": \"CWE-78 Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-77\", \"description\": \"CWE-77 Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"7ffcee3d-2c14-4c3e-b844-86c6a321a158\", \"shortName\": \"harborist\", \"dateUpdated\": \"2026-05-22T13:22:38.873Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9277\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-01T12:05:04.313Z\", \"dateReserved\": \"2026-05-22T12:13:25.893Z\", \"assignerOrgId\": \"7ffcee3d-2c14-4c3e-b844-86c6a321a158\", \"datePublished\": \"2026-05-22T13:22:38.873Z\", \"assignerShortName\": \"harborist\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.