CVE-2026-32805: Romeo is vulnerable to Archive Slip due to missing checks in sanitization

Vulnerability summary

CVE-2026-32805 is a high (CVSS 8.3) vulnerability in ctfer-io romeo. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 39.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 18-03-2026
   PublishedVulnerability first disclosed.
2. 19-03-2026
   Last modifiedVulnerability information updated.

Description

Romeo gives the capability to reach high code coverage of Go ≥1.20 apps by helping to measure code coverage for functional and integration tests within GitHub Actions. Prior to version 0.2.2, the `sanitizeArchivePath` function in `webserver/api/v1/decoder.go` (lines 80-88) is vulnerable to a path traversal bypass due to a missing trailing path separator in the `strings.HasPrefix` check. A crafted tar archive can write files outside the intended destination directory. Version 0.2.2 fixes the issue.

• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.