Is CVE-2026-104026 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-104026?

CVE-2026-104026 has a CVSS v3 severity of HIGH (7.8).

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CVE-2026-104026

Description

In Sapling SCM prior to v0.2.20260929-102736, control characters were allowed to be embedded in Git subtree URLs. A maliciously constructed repository, if cloned by a target, could trigger code execution on otherwise read-only actions such as sl log/blame/annotate.