{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21640 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-21640 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-21640 is a low-severity denial of service vulnerability in Revive Adserver, published on 20 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-21640 and fix it if it is affected.\n\nWhat it is: CVE-2026-21640 is a low-severity denial of service vulnerability in Revive Adserver, published on 20 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-21640 in the wild and no public exploit code.\n\nAffected product: Revive Adserver. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-21640/ (Markdown: https://insights.sbomify.com/CVE-2026-21640/index.md)","id":"CVE-2026-21640","markdown":"https://insights.sbomify.com/CVE-2026-21640/index.md","name":"CVE-2026-21640","record":{"aliases":["GHSA-cr56-64wj-q2r7"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Ad server software","requires_auth":"high_privilege","summary":"An attacker can disable the admin console by injecting specific characters into settings, causing a fatal PHP error.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"hackerone","cpe":[{"product":"revive_adserver","vendor":"aquaplatform"}],"cvss":{"score":2.7,"severity":"low","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","version":"3.0"},"cwes":[{"id":"CWE-134","name":"Use of Externally-Controlled Format String"}],"description":"HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver settings. When specific character combinations are used in a setting, the admin user console could be disabled due to a fatal PHP error.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"Denial of service in Revive Adserver","id":"CVE-2026-21640","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Missing authorization in Revive Adserver","id":"CVE-2026-21641"},"packages":[],"prev":{"headline":"Command injection in airFiber AF60","id":"CVE-2026-21639"},"products":["Revive Adserver"],"published":"2026-01-20","related":[{"cvss_score":7.1,"headline":"Missing authorization in Revive Adserver","id":"CVE-2026-21641","kev_date_added":null,"published":"2026-01-20"},{"cvss_score":6.5,"headline":"Cross-site scripting in Revive Adserver","id":"CVE-2025-55126","kev_date_added":null,"published":"2025-11-20"},{"cvss_score":6.5,"headline":"Denial of service in Revive Adserver","id":"CVE-2025-55128","kev_date_added":null,"published":"2025-11-20"},{"cvss_score":6.1,"headline":"Cross-site scripting in Revive Adserver","id":"CVE-2026-21642","kev_date_added":null,"published":"2026-01-20"},{"cvss_score":6.1,"headline":"Cross-site scripting in Revive Adserver","id":"CVE-2026-21663","kev_date_added":null,"published":"2026-01-20"},{"cvss_score":6.1,"headline":"Cross-site scripting in Revive Adserver","id":"CVE-2026-21664","kev_date_added":null,"published":"2026-01-20"},{"cvss_score":5.4,"headline":"Auth bypass in Revive Adserver","id":"CVE-2025-55129","kev_date_added":null,"published":"2025-12-02"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-21","vendors":["Revive"]},"summary":"An attacker can disable the admin console by injecting specific characters into settings, causing a fatal PHP error.","url":"https://insights.sbomify.com/CVE-2026-21640/"}