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Fencer Vulns
medium 6.5

CVE-2026-55497 json

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

published 2026-07-24 3 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-51392 , GHSA-g9j2-8w95-3vwv , GO-2026-6100

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

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.

Patch / fix

  • go github.com/cloudreve/Cloudreve/v4 4.0.0-20260613024411-3607f79bb44c
  • cloudreve cloudreve 4.17.0
  • govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1

suse advisories SUSE-SU-2026:23625-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1

opensuse advisories openSUSE-SU-2026:21761-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/cloudreve/Cloudreve/v4
<4.0.0-20260613024411-3607f79bb44c
4.0.0-20260613024411-3607f79bb44c
go github.com/cloudreve/Cloudreve/v3
<=3.0.0-20250225100611-da4e44b77af4
all versions
 no fix listed
go github.com/cloudreve/Cloudreve
all versions
 no fix listed

Affected products

  • cloudreve cloudreve

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.