Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
Vulnerability Details :

CVE-2026-42590

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-14 May, 2026 | 15:36
Updated At-15 May, 2026 | 15:57
Rejected At-
Credits

Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blocklist in Gotenberg can be bypassed using ExifTool's group-prefix syntax, enabling arbitrary file rename, move, hardlink, and symlink creation on the server. ExifTool supports group-prefix syntax where File:FileName is processed identically to FileName -- the prefix is stripped by SetNewValue in Writer.pl before tag matching. The safeKeyPattern regex (^[a-zA-Z0-9\-_.:]+$) allows colons, so prefixed tag names pass validation. Any prefix works: File:FileName, System:Directory, a:HardLink, etc. Additionally, FilePermissions, FileUserID, and FileGroupID pseudo-tags are not blocked at all and can modify file attributes without any prefix. This vulnerability is fixed in 8.30.0.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:14 May, 2026 | 15:36
Updated At:15 May, 2026 | 15:57
Rejected At:
▼CVE Numbering Authority (CNA)
Gotenberg: ExifTool group-prefix syntax bypasses dangerous-tag blocklist

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blocklist in Gotenberg can be bypassed using ExifTool's group-prefix syntax, enabling arbitrary file rename, move, hardlink, and symlink creation on the server. ExifTool supports group-prefix syntax where File:FileName is processed identically to FileName -- the prefix is stripped by SetNewValue in Writer.pl before tag matching. The safeKeyPattern regex (^[a-zA-Z0-9\-_.:]+$) allows colons, so prefixed tag names pass validation. Any prefix works: File:FileName, System:Directory, a:HardLink, etc. Additionally, FilePermissions, FileUserID, and FileGroupID pseudo-tags are not blocked at all and can modify file attributes without any prefix. This vulnerability is fixed in 8.30.0.

Affected Products
Vendor
gotenberg
Product
gotenberg
Versions
Affected
  • < 8.30.0
Problem Types
TypeCWE IDDescription
CWECWE-184CWE-184: Incomplete List of Disallowed Inputs
Type: CWE
CWE ID: CWE-184
Description: CWE-184: Incomplete List of Disallowed Inputs
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
x_refsource_CONFIRM
Hyperlink: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
Resource:
x_refsource_CONFIRM
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
exploit
Hyperlink: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
Resource:
exploit
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:14 May, 2026 | 16:16
Updated At:18 May, 2026 | 12:15

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.30.0, The ExifTool metadata write blocklist in Gotenberg can be bypassed using ExifTool's group-prefix syntax, enabling arbitrary file rename, move, hardlink, and symlink creation on the server. ExifTool supports group-prefix syntax where File:FileName is processed identically to FileName -- the prefix is stripped by SetNewValue in Writer.pl before tag matching. The safeKeyPattern regex (^[a-zA-Z0-9\-_.:]+$) allows colons, so prefixed tag names pass validation. Any prefix works: File:FileName, System:Directory, a:HardLink, etc. Additionally, FilePermissions, FileUserID, and FileGroupID pseudo-tags are not blocked at all and can modify file attributes without any prefix. This vulnerability is fixed in 8.30.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Type: Secondary
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
CPE Matches
thecodingmachine
thecodingmachine
>>gotenberg>>Versions before 8.30.0(exclusive)
cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-184Secondarysecurity-advisories@github.com
CWE ID: CWE-184
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855security-advisories@github.com
Exploit
Vendor Advisory
https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Vendor Advisory
Hyperlink: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Hyperlink: https://github.com/gotenberg/gotenberg/security/advisories/GHSA-7v3r-m9c8-r855
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Vendor Advisory

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2026-40893
Matching Score-10
Assigner-GitHub, Inc.
ShareView Details
Matching Score-10
Assigner-GitHub, Inc.
CVSS Score-8.2||HIGH
EPSS-0.15% / 35.89%
||
7 Day CHG~0.00%
Published-14 May, 2026 | 15:18
Updated-18 May, 2026 | 13:02
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Gotenberg: ExifTool Dangerous Tag Blocklist Bypass via Group-Prefixed Tag Names Allows Arbitrary File Rename and Move

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, Gotenberg only checks if the tag is exactly FileName, so System:FileName slips right through and ExifTool happily renames the file. This allows remote attackers to move, rename, and change permissions for arbitrary files. This vulnerability is fixed in 8.31.0.

Action-Not Available
Vendor-thecodingmachinegotenberg
Product-gotenberggotenberg
CWE ID-CWE-184
Incomplete List of Disallowed Inputs
CWE ID-CWE-73
External Control of File Name or Path
Details not found