{"schema":"threatline.record/2","record":{"id":"CVE-2026-91189","aliases":["GHSA-hgcj-22cg-4hfv"],"summary":"GUIX binary resource loader: unvalidated glyph range causes an integer underflow and a heap out-of-bounds write when loading an untrusted font or theme","details":"The GUIX binary resource loader never checks that a font page's glyph range is well formed. `gx_page_header_first_glyph` and `gx_page_header_last_glyph` are read verbatim from the file and only the upper bound of `last_glyph` is validated, so a page declaring `first_glyph > last_glyph` makes `last - first + 1` underflow to a very large unsigned count.\n\n\n\nThat count is multiplied by a glyph record size to reserve the load buffer, and the multiply is unchecked, so it wraps to a small value and the loader allocates a buffer far smaller than the data it is about to write. The load pass then recomputes the count in a narrower type and writes attacker-controlled glyph records into the undersized buffer.","categories":["Unclassified"],"product":"Eclipse ThreadX - GUIX","vendor":"Eclipse Foundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91189","source_modified_at":"2026-10-20T15:25:24.066Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Eclipse ThreadX - GUIX","vendor":"Eclipse Foundation","versions":[{"lessThanOrEqual":"6.5.1.202602a","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"6.5.2.202603"}],"defaultStatus":"unaffected"},{"source":"GitHub Advisory Database","source_url":"https://github.com/eclipse-threadx/guix/security/advisories/GHSA-hgcj-22cg-4hfv","source_modified_at":"2026-10-02T18:45:02Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"ecosystem":"eclipse threadx","name":"GUIX"},"range":"<= 6.5.1.202602a"}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/eclipse-threadx/guix/security/advisories/GHSA-hgcj-22cg-4hfv","source_modified_at":"2026-10-02T18:45:02Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"ecosystem":"eclipse threadx","name":"GUIX"},"version":"6.5.2.202603"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00135,"percentile":0.02681,"score_date":"2026-10-23"},"published_at":"2026-10-20T14:53:44.860Z","modified_at":"2026-10-20T15:25:24.066Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-91189","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T15:25:24.066Z"},{"source":"GitHub Advisory Database","url":"https://github.com/eclipse-threadx/guix/security/advisories/GHSA-hgcj-22cg-4hfv","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-02T18:45:02Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91189","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/eclipse-threadx/guix/security/advisories/GHSA-hgcj-22cg-4hfv"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-20T15:24:56.279111Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-20T15:25:24.066Z","content_hash":"d1cc47aa153748baeb4913a5e7398a8d83e20b93a56d591e540f8f779460a972"}}