Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55086
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 20:17:17 UTC
Updated2026-08-19 20:17:17 UTC
DescriptionEtherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.001390000 probability, percentile 0.037650000 (date 2026-08-20)

Problem Types: CWE-59 | CWE-377 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following') | CWE-377 CWE-377: Insecure Temporary File

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED4.2MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ether Etherpad affected < 3.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996 [email protected] github.com
github.com/ether/etherpad/releases/tag/v3.1.0 [email protected] github.com
github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h [email protected] github.com
github.com/ether/etherpad/pull/7784 [email protected] github.com
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