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Advisory record · GHSA-cqjp-jf4r-h5q9

Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS

CVSS 7.5 HighEPSS 0.0075 · 55th percentile

Published by the GitHub Advisory Database at 31 Jul 2026, 18:54 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
thumborPyPI<7.8.07.8.0
Identifiers
GHSA-cqjp-jf4r-h5q9 · CVE-2026-53503 · PYSEC-2026-3619
Weakness (CWE)
CWE-20 · CWE-369
Tags
Published
31 Jul 2026
Updated
4 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Thumbor versions before 7.8.0 are vulnerable to a denial of service through the convolution filter, where a columns value of 0 causes a divide-by-zero in the C extension and crashes the process. An attacker can trigger the crash remotely with a crafted image request; if unsafe URLs are disabled, they need a valid signed URL. Upgrade to Thumbor 7.8.0 or later.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0075, the 55th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:40 UTC First seen by agentprime
  2. 31 Oct 2026, 14:40 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.