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CVE-2026-123370— compose-lint: `fix --apply` can delete a line the user did not select, including a security setting

Quick assessment

Affected
tmatens compose-lint
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

compose-lint 是一款用于 Docker Compose 的安全检查工具，能够在部署前识别危险配置。在 0.9.0 至 0.18.0 版本中，compose-lint 的 YAML 解析器将单独的 carriage return（\r）、以及 Unicode 行分隔符 U+0085、U+2028 和 U+2029 均识别为换行符；然而，其修复位置的转换逻辑仅统计换行符（\n）。攻击者可通过拉取请求（pull request）在引号包裹的值中插入上述某种分隔符，导致执行 时，后续所有编辑发生偏移，并删除目标

CVSS 5.1 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
tmatens compose-lint >= 0.9.0, < 0.18.0 affected
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I. Basic Information for CVE-2026-123370

Vulnerability Information
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Vulnerability Title
compose-lint: `fix --apply` can delete a line the user did not select, including a security setting
Source: CVE Program / CVE List V5
Vulnerability Description
compose-lint is a Docker Compose security linter that identifies dangerous misconfigurations before deployment. From 0.9.0 until 0.18.0, compose-lint's YAML parser recognizes lone carriage returns and Unicode line separators U+0085, U+2028, and U+2029 as line breaks while fix position conversion counts only newline characters. A pull request can place one of these separators in a quoted value so fix --apply shifts each later edit and deletes the line after the selected target, including an unselected network or other security setting. The resulting Compose file can remain valid, post-edit checks can pass, and the command can report a successful fix even though the dry-run diff was the only place showing the extra deletion. This issue is fixed in version 0.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tmatens compose-lint >= 0.9.0, < 0.18.0 -

II. Public POCs for CVE-2026-123370

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III. Intelligence Information for CVE-2026-123370

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Other References for CVE-2026-123370 (6)

Same Patch Batch · tmatens · 2026-11-09 · 7 CVEs total

CVE-2026-123369 5.3 MEDIUM compose-lint: Compose file text can issue GitHub Actions workflow commands through the com
CVE-2026-123368 2.3 LOW compose-lint: .env read through a symlink outside the project can expose the CI job's envi
CVE-2026-123371 2.3 LOW compose-lint: A `.compose-lint.yml` symlinked outside the project is read, and a parse err
CVE-2026-123372 2.3 LOW compose-lint: A pull request can make compose-lint quote a secret from a CI-generated `.en
CVE-2026-123373 2.3 LOW compose-lint: A committed symlink makes compose-lint quote a file from outside the project
CVE-2026-123796 2.3 LOW compose-lint: Incomplete fix for GHSA-jf3h-8jvx-vcrg: a run stopped at the finding limit q

IV. Related Vulnerabilities

Same product: compose-lint
Same vendor: tmatens
Same weakness: CWE-193