HOMEVULNERABILITIESCVE-2026-34730
MEDIUM

CVE-2026-34730

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

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.0th

Official Description

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This issue has been patched in version 9.14.1.

NVD Source

Technical Analysis

CVE-2026-34730 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.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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/5413062eb17b73dc885f5e645cdc161e69ef641b
ADVISORYhttps://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h
ADVISORYhttps://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h

All References (4)

→
https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641bPatch
→
https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
→
https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4hExploit · Vendor Advisory
→
https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4hExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-34730
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-22
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 2, 2026

Related CVEs (CWE-22)

CVE-2026-48282
KEV10.0
CVE-2026-34909
KEV10.0
CVE-2026-36767
10.0
CVE-2026-39861
10.0
CVE-2026-54917
10.0
CVE-2026-41211
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34730 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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