CVE-2026-34726

MEDIUMNVD 4.44.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.4 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
4.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 4.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.

CVSS v3
4.4
EG Score
4.4MEDIUMmedium confidence
EG Risk
36
EG Risk 36/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity44% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

Published

April 2, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jul 26, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

Copier `_subdirectory` allows template root escape via parent-directory traversal · Advisory · copier-org/copier · GitHub

https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6
github_release Patch Available

v9.14.1 (2026-03-31)

Patch available: copier-org/copier v9.14.1

https://github.com/copier-org/copier/releases/tag/v9.14.1
github_commit Patch Available

commit cb80a3ffc9c3 (copier-org/copier)

Patch available: copier-org/copier v9.14.1 (contains commit cb80a3ffc9c3)

https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
copier2.0.0 ... 9.9.1 (82 versions)
  • every version up to 9.14.1: fixed in 9.14.1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 180 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
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  15. 2026-09-21 13:49 UTCOSV refresh
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  1. 2026-09-11 09:37 UTCEPSS rescore
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  8. 2026-09-02 11:14 UTCOSV refresh
  9. 2026-09-01 13:53 UTCEPSS rescore
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  24. 2026-08-16 09:21 UTCEG score recompute
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  40. 2026-08-05 19:17 UTCEPSS rescore
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  43. 2026-08-03 22:41 UTCEG score recompute
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  45. 2026-08-02 14:39 UTCEG score recompute
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  60. 2026-07-23 03:09 UTCEG score recompute
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  64. 2026-07-19 14:31 UTCEPSS rescore
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  67. 2026-07-17 03:24 UTCOSV refresh
  68. 2026-07-16 17:03 UTCEPSS rescore
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  73. 2026-07-13 06:13 UTCEPSS rescore
  74. 2026-07-13 06:13 UTCEPSS rescore
  75. 2026-07-12 05:46 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-34726?
CVE-2026-34726 is a medium vulnerability published on April 2, 2026. Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when…
When was CVE-2026-34726 disclosed?
CVE-2026-34726 was first published on April 2, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34726 actively exploited?
CVE-2026-34726 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34726?
CVE-2026-34726 has a CVSS v3 base score of 4.4 (NVD).
How do I remediate CVE-2026-34726?
A fix for CVE-2026-34726 is available: update to the fixed version the vendor names in its advisory.

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