Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Infracost versions before 0.10.45 are vulnerable to arbitrary file read through symlink traversal in the config-template parser's readFile, pathExists, isDir and matchPaths functions. An attacker who can open a pull request can commit an intermediate directory symlink that makes these functions read files outside the checkout, with the contents shown in the generated config and PR comment. Upgrade to 0.10.45 or later; the impact is greater if Infracost runs under pull_request_target or same-repository pull requests.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.9 | Medium | 4.0 | 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 | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0054, the 46th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-mmg6-4qmv-6pc8
- OSV: GHSA-mmg6-4qmv-6pc8
- github.com/infracost/infracost/security/advisories/GHSA-mmg6-4qmv-6pc8
- nvd.nist.gov/vuln/detail/CVE-2026-71493
- github.com/infracost/infracost/pull/3586
- github.com/infracost/infracost/commit/4d39331afc0e27752d16d9d91c34583e5e8487fb
- github.com/infracost/infracost
- github.com/infracost/infracost/releases/tag/v0.10.45