{"answers":{"affected":"3 open source packages ship an affected version, including thumbor.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53503 exists.","fix":"Upgrade thumbor to 7.8.0 or later.","what":"CVE-2026-53503 is a high-severity denial of service vulnerability in thumbor, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-53503 and fix it if it is affected.\n\nWhat it is: CVE-2026-53503 is a high-severity denial of service vulnerability in thumbor, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53503 exists.\n\nAffected packages and fixed versions:\n- thumbor (PyPI): affected all versions; fixed in 7.8.0\n- thumbor (PyPI): affected all versions; fixed in 7.8.0\n- thumbor (PyPI): affected all versions; fixed in 7.8.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-53503/ (Markdown: https://insights.sbomify.com/CVE-2026-53503/index.md)","id":"CVE-2026-53503","markdown":"https://insights.sbomify.com/CVE-2026-53503/index.md","name":"CVE-2026-53503","record":{"aliases":["DEBIAN-CVE-2026-53503","GHSA-cqjp-jf4r-h5q9","PYSEC-2026-3619","UBUNTU-CVE-2026-53503"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Image thumbnail service","requires_auth":"none","summary":"Remote attackers can crash the Thumbor service by sending a convolution filter request with zero columns, causing a divide-by-zero error.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-369","name":"Divide By Zero"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor's filters:convolution(\u003cmatrix\u003e, \u003ccolumns\u003e, \u003cshould_normalize\u003e) filter passes the user-controlled \u003ccolumns\u003e value to a C extension (thumbor/ext/filters/_convolution.c) where it is used as a divisor (for % and /) without validating columns \u003e 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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Thumbor convolution filter allows divide-by-zero in C extension leading to remote DoS","id":"CVE-2026-53503","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Thumbor has Regex Denial of Service (ReDoS) in `convolution` filter","id":"CVE-2026-53504"},"packages":[{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":null,"source":"GHSA-cqjp-jf4r-h5q9"},{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":"pkg:pypi/thumbor","source":"GHSA-cqjp-jf4r-h5q9"},{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":"pkg:pypi/thumbor","source":"PYSEC-2026-3619"}],"prev":{"headline":"Thumbor has path traversal via post-validation URL decoding bypass in file_loader","id":"CVE-2026-53502"},"products":["thumbor"],"published":"2026-07-31","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-31","vendors":["thumbor"]},"summary":"Remote attackers can crash the Thumbor service by sending a convolution filter request with zero columns, causing a divide-by-zero error.","url":"https://insights.sbomify.com/CVE-2026-53503/"}