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CVE-2026-53503

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(<matrix>, <columns>, <should_normalize>) 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 /) 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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:79363caa0ff7508905eed12b1ec7938f610b6f2cc90c5160f5d1d3da1a708ab6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-369","description":"CWE-369: Divide By Zero","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"thumbor","vendor":"thumbor","versions":[{"status":"affected","version":"< 7.8.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-369","description":"CWE-369: Divide By Zero","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/problemTypes/1/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/thumbor/thumbor/commit/447e192e3fb92e64c12e5354a56a4a7133f69d73","tags":["x_refsource_MISC"],"url":"https://github.com/thumbor/thumbor/commit/447e192e3fb92e64c12e5354a56a4a7133f69d73"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/references/1
{"name":"https://github.com/thumbor/thumbor/releases/tag/7.8.0","tags":["x_refsource_MISC"],"url":"https://github.com/thumbor/thumbor/releases/tag/7.8.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/references/2
{"name":"https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/thumbor/thumbor/security/advisories/GHSA-cqjp-jf4r-h5q9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9de70973a63777044ab3a540909ae5aeff9a60a1a2cfd8fe78e4629e0bcaa155 · sha256:ea2e14aff9bc2c4c… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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