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TI-2026-40050 Aliases CVE-2026-55497GHSA-g9j2-8w95-3vwv

Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)

Priority MEDIUM 62CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the built-in thumbnail and avatar image decoders limit compressed file size but do not limit decoded pixel dimensions, allowing an authenticated user to submit a small PNG, JPEG, or GIF that triggers an unbounded allocation and terminates the Cloudreve process through fatal out-of-memory behavior. This issue is fixed in version 4.17.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0053 45th percentileScored 2026-11-07
Fix Fixed cloudreve (cloudreve): 4.17.0github.com/cloudreve/Cloudreve/v4 (Go): 4.0.0-20260613024411-3607f79bb44c

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cloudrevecloudrevebefore 4.17.04.17.0Patch availableCNA
—github.com/cloudreve/Cloudreve/v4 (Go)before 4.0.0-20260613024411-3607f79bb44c4.0.0-20260613024411-3607f79bb44cPatch availableGHSA-g9j2-8w95-3vwv
—github.com/cloudreve/Cloudreve/v3 (Go)up to 3.0.0-20250225100611-da4e44b77af4—No fix listedGHSA-g9j2-8w95-3vwv
  • cloudreve Vendorcloudreve Affected before 4.17.0 Fixed in 4.17.0 Patch available CNA
  • github.com/cloudreve/Cloudreve/v4 (Go) Vendor— Affected before 4.0.0-20260613024411-3607f79bb44c Fixed in 4.0.0-20260613024411-3607f79bb44c Patch available GHSA-g9j2-8w95-3vwv
  • github.com/cloudreve/Cloudreve/v3 (Go) Vendor— Affected up to 3.0.0-20250225100611-da4e44b77af4 Fixed in — No fix listed GHSA-g9j2-8w95-3vwv

Remediation

  • Fix · CNA cloudreve (cloudreve) Fixed in 4.17.0
  • Fix · GHSA-g9j2-8w95-3vwv github.com/cloudreve/Cloudreve/v4 (Go) Fixed in 4.0.0-20260613024411-3607f79bb44c Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55497
  2. 2026-10-03 Alias added: GHSA-g9j2-8w95-3vwv

References

Other 4

  • TI-2026-65089 Cloudreve before 4.16.1 Authentication Bypass via Cached Context Hint CVSS 4.0MEDIUM 6.9
  • TI-2026-39397 Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim CVSS 3.1HIGH 7.6
  • TI-2026-40054 Cloudreve: OAuth Admin.Read scope can update OneDrive storage policy credentials CVSS 3.1HIGH 7.1
  • TI-2026-39400 Incorrect authorization in cloudreve CVSS 3.1HIGH 7.1
  • TI-2026-39399 Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses CVSS 3.1MEDIUM 6.5
  • TI-2026-44495 Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored CVSS 3.1MEDIUM 6.3
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences