{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-78206 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-78206 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-78206 is a high-severity denial of service vulnerability in exceljs, published on 24 Aug 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-2026-78206 and fix it if it is affected.\n\nWhat it is: CVE-2026-78206 is a high-severity denial of service vulnerability in exceljs, published on 24 Aug 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-2026-78206 in the wild and no public exploit code.\n\nAffected product: exceljs. 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-2026-78206/ (Markdown: https://insights.sbomify.com/CVE-2026-78206/index.md)","id":"CVE-2026-78206","markdown":"https://insights.sbomify.com/CVE-2026-78206/index.md","name":"CVE-2026-78206","record":{"aliases":["GHSA-7cvf-3r55-r39q","GHSA-r7gv-hxj8-94c4"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript Excel library","requires_auth":"none","summary":"Attackers can cause denial of service by uploading highly compressed xlsx files that exhaust memory during decompression in the exceljs library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-409","name":"Improper Handling of Highly Compressed Data (Data Amplification)"}],"description":"exceljs through 4.4.0 decompresses all entries from supplied xlsx archives into memory without limits on entry size, total size, or compression ratio. Attackers can upload highly compressed workbooks that expand to gigabytes in memory, exhausting available resources and causing denial of service.","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":"exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression","id":"CVE-2026-78206","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization","id":"CVE-2026-78207"},"packages":[],"prev":{"headline":"BentoML 1.4.19 through 1.4.39 Server-Side Request Forgery via Unfiltered RFC 6598 Shared Address Space","id":"CVE-2026-78205"},"products":["exceljs"],"published":"2026-08-24","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-08-29","vendors":["exceljs"]},"summary":"Attackers can cause denial of service by uploading highly compressed xlsx files that exhaust memory during decompression in the exceljs library.","url":"https://insights.sbomify.com/CVE-2026-78206/"}