UBUNTU-CVE-2026-9277

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2026-9277
Downstream
USN-8410-1
Published: 22 May 2026, 14:16
Last modified:30 Jun 2026, 18:18

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.2 CRITICAL
4.0 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 May 2026, 14:16
Published
Vulnerability first disclosed
30 Jun 2026, 18:18
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v4.0•CRITICAL•Score: 9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•node-shell-quote

    all | all | all | all | all | all | < 1.6.1+20160617-git72fb5a8ce29b-1ubuntu0.1~esm1 | < 1.7.3+~1.7.1-1ubuntu0.1~esm1 | < 1.7.4+~1.7.1-1ubuntu0.24.04.1 | < 1.7.4+~1.7.1-1ubuntu0.25.10.1 | < 1.8.3+~1.7.5-1ubuntu0.1~esm1

References (9)