VulnerabilityDeferred

CVE-2026-53504

Prior to 7.8.0, the convolution filter regular expression performs exponential backtracking on crafted repeated numeric input, allowing a URL request to exhaust processing time.

HIGH 7.5EPSS 0.41%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, the convolution filter regular expression performs exponential backtracking on crafted repeated numeric input, allowing a URL request to exhaust processing time. This issue is fixed in 7.8.0.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.41% probability · 34th percentile
CISA KEV: Not listed
Weakness: CWE-400
Source: security-advisories@github.com

References

https://github.com/thumbor/thumbor/commit/3f38fe1610d20168e91f76d432212de30727eb2e
https://github.com/thumbor/thumbor/releases/tag/7.8.0
https://github.com/thumbor/thumbor/security/advisories/GHSA-5vjc-7cxw-4w6j
https://github.com/thumbor/thumbor/security/advisories/GHSA-5vjc-7cxw-4w6j

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.