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OpenAdvisories
Medium · 6.5 CVE-2026-55497 EUVD-2026-51392GHSA-g9j2-8w95-3vwvGO-2026-6100

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

Published Jul 31, 2026 · Updated Jul 31, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
cloudreve cloudreve < 4.17.0 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
SLES for SAP 16.0 govulncheck-vulndb 0.0.20260827T195228-160000.1.1 SUSE-SU-2026:23625-1
SLES 16.0 govulncheck-vulndb 0.0.20260827T195228-160000.1.1 SUSE-SU-2026:23625-1
ReleasePackageFixed inAdvisory
openSUSE Leap 16.0 govulncheck-vulndb 0.0.20260827T195228-160000.1.1 openSUSE-SU-2026:21761-1

Affected packages

EcosystemPackageAffectedFixedRecord
Go github.com/cloudreve/Cloudreve all versions — GO-2026-6100
Go github.com/cloudreve/Cloudreve/v3 <= 3.0.0-20250225100611-da4e44b77af4 — GHSA-g9j2-8w95-3vwv
Go github.com/cloudreve/Cloudreve/v3 all versions — GO-2026-6100
Go github.com/cloudreve/Cloudreve/v4 < 4.0.0-20260613024411-3607f79bb44c 4.0.0-20260613024411-3607f79bb44c GHSA-g9j2-8w95-3vwv

Advisories 2

References