HOMEVULNERABILITIESCVE-2026-34726
MEDIUM

CVE-2026-34726

CWE-22Published: April 2, 2026· Updated: Apr 3, 2026

4.4
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:5.0th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-34726 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Vendors & Products

copier-org1 product
copier
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df
ADVISORYhttps://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6
ADVISORYhttps://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6

All References (4)

→
https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3dfPatch
→
https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
→
https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit · Vendor Advisory
→
https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-34726
CVSS Score4.4 / 10
SeverityMEDIUM
WeaknessCWE-22
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 2, 2026

Related CVEs (CWE-22)

CVE-2026-34909
KEV10.0
CVE-2026-11414
10.0
CVE-2026-2731
10.0
CVE-2026-11420
10.0
CVE-2026-41211
10.0
CVE-2026-22557
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34726 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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