Disclosure summary
CVE-2026-34743 is a medium-severity CWE-122 vulnerability in XZ Utils. Empty-index decoding can trigger heap buffer overflow. Cantina reproduced the behavior, verified its security impact, and coordinated disclosure with the affected maintainer.
Verification standard
Cantina publishes a disclosure only after reproducing the behavior, validating its security impact, and coordinating remediation with the affected project.