Vulnerability · Published Jul 31, 2026 · Assigned by GitHub_M
CVE-2026-53504Thumbor has Regex Denial of Service (ReDoS) in `convolution` filter
High 7.5
In plain English
A high-severity uncontrolled resource consumption in thumbor from thumbor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 50.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | thumbor | 7.8.0-1 | DEBIAN-CVE-2026-53504 |
| PyPI | thumbor | 7.8.0 | GHSA-5vjc-7cxw-4w6j |
| PyPI | thumbor | 7.8.0 | PYSEC-2026-3616 |
| Ubuntu:26.04:LTS | thumbor | no fix listed | UBUNTU-CVE-2026-53504 |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/thumbor/thumbor/security/advisories/GHSA-5vjc-7cxw-4w6j x_refsource_CONFIRM
- https://github.com/thumbor/thumbor/commit/3f38fe1610d20168e91f76d432212de30727eb2e x_refsource_MISC
- https://github.com/thumbor/thumbor/releases/tag/7.8.0 x_refsource_MISC