{"id":"CVE-2026-103658","title":"GNU Aspell 0.60.8.2 (first vulnerable version is not known) contains a heap-based buffer overflow write (CWE-122) in its read-only dictionary loader","summary":"GNU Aspell 0.60.8.2 (first vulnerable version is not known) contains a heap-based buffer overflow write (CWE-122) in its read-only dictionary loader. String::reserve() in common/string.hpp computes its capacity check with a signed int ((…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-122"],"vendor":"GNU","product":"Aspell","affected":["Aspell 0.60.8.2"],"published":"2026-10-12","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:39.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103658","references":[{"url":"https://github.com/GNUAspell/aspell/security/advisories/GHSA-p35p-2mw5-fj5j","label":"98a01053-8a31-4f6d-9aa9-252be161adc6"},{"url":"https://github.com/GNUAspell/aspell/security/advisories/GHSA-p35p-2mw5-fj5j","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00213,"epssPercentile":0.11584,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-14T19:15:22.350465Z"},"ingestedAt":"2026-10-12T23:07:25.633Z","slug":"CVE-2026-103658","body":"## Overview\n\nGNU Aspell 0.60.8.2 (first vulnerable version is not known) contains a heap-based buffer overflow write (CWE-122) in its read-only dictionary loader. String::reserve() in common/string.hpp computes its capacity check with a signed int ((int)s + 1), so a requested size of 0x7FFFFFFF wraps negative and the backing buffer is never grown. ReadOnlyDict::load() in modules/speller/default/readonly_ws.cpp passes the unvalidated 32-bit size fields from a .rws dictionary header into this path, so a crafted .rws file with a valid endian marker (12345678) and an oversized length field (e.g. lang_name_size = 0x7FFFFFFF) causes attacker-controlled data to be written out of bounds past an undersized heap allocation. An attacker who induces a victim to load a malicious dictionary — for example via aspell dump master <file> — can corrupt heap memory, resulting in denial of service and potentially code execution. Fixed in b830b6e and will be fixed in release 0.60.8.3.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":44,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":221869,"id":"CVE-2026-103658","ts":1792035878233,"field":"exploit_available","old":"false","new":"true"}]}