High severityNVD Advisory· Published Jul 31, 2026· Updated Sep 8, 2026

CVE-2026-53502

Description

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, file_loader decodes percent-encoded path segments after its root-boundary validation, allowing traversal outside FILE_LOADER_ROOT_PATH through watermark or frame filter input. This issue is fixed in 7.8.0.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
thumborPyPI	< 7.8.0	7.8.0

Affected products

Thumbor/thumborllm-fuzzy
Range: <7.8.0

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-cj54-hpcc-gj6hghsaADVISORY
github.com/thumbor/thumbor/commit/3b986d13677b30fe6651c8c72ebb25957ac0a40dnvdWEB
github.com/thumbor/thumbor/releases/tag/7.8.0nvdWEB
github.com/thumbor/thumbor/security/advisories/GHSA-cj54-hpcc-gj6hnvdWEB

News mentions

Thumbor: Four Vulnerabilities Including Path Traversal and DoS Disclosed Together
Vypr Intelligence · Aug 1, 2026

cvss	0.455
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000