{"answers":{"affected":"3 open source packages ship an affected version, including thumbor.","exploited":"There is no known exploitation of CVE-2026-53501 in the wild and no public exploit code.","fix":"Upgrade thumbor to 7.8.0 or later.","what":"CVE-2026-53501 is a high-severity 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-2026-53501 and fix it if it is affected.\n\nWhat it is: CVE-2026-53501 is a high-severity 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: There is no known exploitation of CVE-2026-53501 in the wild and no public exploit code.\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-2026-53501/ (Markdown: https://insights.sbomify.com/CVE-2026-53501/index.md)","id":"CVE-2026-53501","markdown":"https://insights.sbomify.com/CVE-2026-53501/index.md","name":"CVE-2026-53501","record":{"aliases":["DEBIAN-CVE-2026-53501","GHSA-mw3h-qjxj-6xg9","PYSEC-2026-3620","UBUNTU-CVE-2026-53501"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Image thumbnail service","requires_auth":"none","summary":"Attackers can bypass HMAC validation in Thumbor by manipulating URL signatures, allowing unauthorized access to images from unintended domains or paths.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabling loading images from unintended domains or paths. 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":"none_known"},"has_fix":true,"headline":"Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature","id":"CVE-2026-53501","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Thumbor has path traversal via post-validation URL decoding bypass in file_loader","id":"CVE-2026-53502"},"packages":[{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":null,"source":"GHSA-mw3h-qjxj-6xg9"},{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":"pkg:pypi/thumbor","source":"GHSA-mw3h-qjxj-6xg9"},{"ecosystem":"PyPI","fixed":["7.8.0"],"introduced":["0"],"last_affected":[],"package":"thumbor","purl":"pkg:pypi/thumbor","source":"PYSEC-2026-3620"}],"prev":{"headline":"Thumbor treats ALLOWED_SOURCES string patterns as unescaped regex, allowing hostname bypass via wildcard dot","id":"CVE-2026-53500"},"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-31","vendors":["thumbor"]},"summary":"Attackers can bypass HMAC validation in Thumbor by manipulating URL signatures, allowing unauthorized access to images from unintended domains or paths.","url":"https://insights.sbomify.com/CVE-2026-53501/"}