What’s Vulnerable › Vulnerabilities

CVE-2026-53504: Thumbor has Regex Denial of Service (ReDoS) in `convolution` filter

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-31 · updated 2026-09-08
• Weakness: CWE-400

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.

Affected products

• thumbor: before 7.8.0

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

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