{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-63276 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-63276 is a medium-severity memory corruption vulnerability in The Document Foundation LibreOffice, published on 22 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-63276 and fix it if it is affected.\n\nWhat it is: CVE-2026-63276 is a medium-severity memory corruption vulnerability in The Document Foundation LibreOffice, published on 22 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-63276 in the wild and no public exploit code.\n\nAffected product: The Document Foundation LibreOffice. 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-2026-63276/ (Markdown: https://insights.sbomify.com/CVE-2026-63276/index.md)","id":"CVE-2026-63276","markdown":"https://insights.sbomify.com/CVE-2026-63276/index.md","name":"CVE-2026-63276","record":{"aliases":["DEBIAN-CVE-2026-63276","ECHO-5352-3f6e-0c72","GHSA-3xpv-4h8q-pj26","MINI-mhqq-m3gr-8vvh","UBUNTU-CVE-2026-63276"],"analysis":{"component_type":"desktop_application","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"LibreOffice","requires_auth":"none","summary":"A stack buffer overflow in LibreOffice's CFF to Type 1 font conversion allows attackers to execute arbitrary code or cause a crash via malicious documents.","user_interaction":"required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Document Fdn.","cpe":[],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"LibreOffice converts CFF fonts to Type 1 when it subsets a font, which happens when a document is exported to PDF, and CFF fonts may be embedded in documents. A stack buffer overflow existed in that conversion. The converted operators were written into a fixed size buffer with no check that they still fit, so a glyph emitting many operators wrote past the end of the buffer. In fixed versions the remaining capacity is tracked and the conversion stops when it is used up.","ecosystems":[],"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":"Stack buffer overflow in CFF to Type 1 font conversion","id":"CVE-2026-63276","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"RCE via calcext:data-mappings, sql provider and jdbc connector","id":"CVE-2026-63277"},"packages":[],"prev":{"headline":"Stack buffer overflow in CFF font hint handling","id":"CVE-2026-63275"},"products":["LibreOffice"],"published":"2026-09-22","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-22","vendors":["The Document Foundation"]},"summary":"A stack buffer overflow in LibreOffice's CFF to Type 1 font conversion allows attackers to execute arbitrary code or cause a crash via malicious documents.","url":"https://insights.sbomify.com/CVE-2026-63276/"}