CVE-2026-53503

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8% (53rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(, , ) filter passes the user-controlled value to a C extension (thumbor/ext/filters/_convolution.c) where it is used as a divisor (for % and /) without validating columns > 0. When columns=0, the C code triggers undefined behavior; on x86_64 this reliably results in a fatal divide-by-zero trap (SIGFPE) and crashes the Thumbor process, causing a remote denial of service. This issue is fixed in 7.8.0.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 31, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Jul 31, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS · Advisory · thumbor/thumbor · GitHub

https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9
github_release Patch Available

Release 7.8.0

Patch available: thumbor/thumbor 7.8.0

https://github.com/thumbor/thumbor/releases/tag/7.8.0
github_commit Patch Available

commit 447e192e3fb9 (thumbor/thumbor)

Patch available: thumbor/thumbor 7.8.0 (contains commit 447e192e3fb9)

https://github.com/thumbor/thumbor/commit/447e192e3fb92e64c12e5354a56a4a7133f69d73

Vendor Advisories for CVE-2026-53503(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 2 ecosystems)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
thumbor6.3.2-3 ... 7.7.7-6 (16 versions)
  • every version up to 7.8.0-1: fixed in 7.8.0-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
thumbor4.1.3 ... 7.7.7 (118 versions)
  • every version up to 7.8.0: fixed in 7.8.0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-10-04 06:29 UTCEG score recompute
  2. 2026-10-03 14:26 UTCEPSS rescore
  3. 2026-10-02 17:56 UTCEPSS rescore
  4. 2026-10-02 16:49 UTCEG score recompute
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  7. 2026-09-30 15:03 UTCEPSS rescore
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  9. 2026-09-29 06:49 UTCEG score recompute
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  11. 2026-09-27 18:42 UTCEG score recompute
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  18. 2026-09-22 21:34 UTCEG score recompute
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  22. 2026-09-19 23:41 UTCEG score recompute
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  24. 2026-09-18 19:28 UTCEPSS rescore
  25. 2026-09-18 01:16 UTCEG score recompute
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  1. 2026-09-17 01:23 UTCEG score recompute
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  5. 2026-09-13 23:57 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescore
  7. 2026-09-12 22:18 UTCEG score recompute
  8. 2026-09-11 20:35 UTCEG score recompute
  9. 2026-09-11 14:53 UTCEPSS rescore
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  20. 2026-09-04 05:06 UTCEPSS rescore
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  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 22:31 UTCEG score recompute
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-08-30 23:57 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescore
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  31. 2026-08-28 21:41 UTCEPSS rescore
  32. 2026-08-27 21:39 UTCEG score recompute
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-26 19:34 UTCEG score recompute
  35. 2026-08-26 14:46 UTCEPSS rescore
  36. 2026-08-25 17:32 UTCEG score recompute
  37. 2026-08-25 13:49 UTCEPSS rescore
  38. 2026-08-24 15:14 UTCEG score recompute
  39. 2026-08-23 13:13 UTCEG score recompute
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-22 11:18 UTCEG score recompute
  42. 2026-08-21 23:49 UTCEPSS rescore
  43. 2026-08-21 09:36 UTCEG score recompute
  44. 2026-08-20 22:55 UTCEPSS rescore
  45. 2026-08-19 19:06 UTCEG score recompute
  46. 2026-08-19 17:04 UTCEPSS rescore
  47. 2026-08-18 15:50 UTCEG score recompute
  48. 2026-08-18 13:48 UTCEPSS rescore
  49. 2026-08-18 01:00 UTCEG score recompute
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 23:19 UTCEG score recompute
  52. 2026-08-16 14:56 UTCEPSS rescore
  53. 2026-08-16 10:29 UTCEG score recompute
  54. 2026-08-16 02:14 UTCEPSS rescore
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  57. 2026-08-14 07:11 UTCEG score recompute
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  59. 2026-08-12 16:41 UTCEG score recompute
  60. 2026-08-12 13:51 UTCEPSS rescore
  61. 2026-08-11 15:02 UTCEG score recompute
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  65. 2026-08-09 13:46 UTCEPSS rescore
  66. 2026-08-08 22:52 UTCEG score recompute
  67. 2026-08-08 16:37 UTCEPSS rescore
  68. 2026-08-07 21:13 UTCEG score recompute
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  70. 2026-08-06 13:47 UTCEPSS rescore
  71. 2026-08-06 06:43 UTCEG score recompute
  72. 2026-08-05 19:17 UTCEPSS rescore
  73. 2026-08-04 16:14 UTCEG score recompute
  74. 2026-08-04 15:10 UTCEPSS rescore
  75. 2026-08-04 10:39 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-53503?
CVE-2026-53503 is a high vulnerability published on July 31, 2026. Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(<matrix>, <columns>, <shouldnormalize>) filter passes the user-controlled <columns> value to a C extension (thumbor/ext/filters/convolution.c) where it is used as a divisor (for % and /)…
When was CVE-2026-53503 disclosed?
CVE-2026-53503 was first published on July 31, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53503 actively exploited?
CVE-2026-53503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53503?
CVE-2026-53503 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53503?
A fix for CVE-2026-53503 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53503 are linked in the Vendor Advisories panel on this page.

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