# CVE-2026-124029: Kopia through 0.23.1 Path Traversal in Snapshot Restore via Directory Entry Names

Status: published. Published: 2026-11-06. Updated: 2026-11-11.

Kopia through 0.23.1 contains a path traversal vulnerability in copyDirectoryContent that allows users with repository write access to escape the restore directory via crafted entry names. Attackers can create snapshots whose directory manifest entries are named '..', so victims restoring with default options write attacker-chosen content outside the restore directory.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kopia / kopia (github.com/kopia/kopia): ≥ 0; ≤ 0.23.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.7 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 5.7 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.27% as of 2026-11-10; percentile 19.02%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

- exploit: https://github.com/kopia/kopia/issues/5700 (ADP: CISA-ADP)

## References

- https://github.com/kopia/kopia/issues/5700 (CNA: VulnCheck; issue-tracking)

- https://github.com/kopia/kopia (CNA: VulnCheck; product)

- https://github.com/kopia/kopia/blob/v0.23.1/snapshot/restore/restore.go#L397 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/kopia-through-0.23.1-path-traversal-in-snapshot-restore-via-directory-entry-names (CNA: VulnCheck; third-party-advisory)

- https://github.com/kopia/kopia/issues/5700 (ADP: CISA-ADP; exploit)

- https://github.com/kopia/kopia (disclosure@vulncheck.com)

- https://github.com/kopia/kopia/blob/v0.23.1/snapshot/restore/restore.go#L397 (disclosure@vulncheck.com)

- https://github.com/kopia/kopia/issues/5700 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/kopia-through-0.23.1-path-traversal-in-snapshot-restore-via-directory-entry-names (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-124029; retrieved 2026-11-11; source updated 2026-11-11

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124029; retrieved 2026-11-07; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-124029; retrieved 2026-11-11; source updated Not reported

Revision: 2cce0d149a88403c99d12e2ad10cc0e2fbb7d6a6e170f63d8a8414429475b50f

Canonical: https://y2.dev/cve/CVE-2026-124029

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