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Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M

CVE-2026-71493Infracost: Arbitrary file read via config-template readFile symlink traversal

Medium 5.9

In plain English

A medium-severity path traversal in infracost from infracost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.9Medium
Exploit odds (30 days)0.5%top 54.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Infracost provides cloud cost intelligence for engineers, AI coding agents, and CI/CD. Prior to 0.10.45, the readFile, pathExists, isDir, and matchPaths template functions in internal/config/template/parser.go use a lexical filepath.Rel check and a leaf-only os.Lstat check that do not resolve an intermediate directory symlink. A repository can contain a path such as evil/file where evil points outside the checkout, causing os.ReadFile and related operations to follow the symlink and read runner-accessible files. The resulting content is rendered into generated configuration and can be surfaced through the Infracost dashboard or pull request comment, with greater impact in workflows that provide repository secrets. This issue is fixed in version 0.10.45.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/infracost/infracost0.10.45GHSA-mmg6-4qmv-6pc8
Gogithub.com/infracost/infracost0.10.45GO-2026-6439

Affected products (as reported)

VendorProductVersions
infracost infracost < 0.10.45

Weakness: CWE-22, CWE-59 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References