{"id":"CVE-2026-77372","title":"VeraCrypt: Heap overflow and out-of-bounds read in Serializable deserialization (elevated Core service input path)","summary":"VeraCrypt provides disk encryption with strong security based on TrueCrypt. Prior to 1.26.30, the Unix, macOS, and FreeBSD serialization paths in src/Platform/Serializer.cpp and src/Volume/VolumePassword.cpp accept untrusted length and c…","severity":"high","cvss":8.8,"cvssVector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","cvssSource":"cna","cwe":["CWE-125","CWE-787"],"vendor":"veracrypt","product":"VeraCrypt","affected":["VeraCrypt < 1.26.30"],"published":"2026-11-04","updated":"2026-11-04","sourceUpdated":"2026-11-04T22:53:57.172Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-77372","references":[{"url":"https://github.com/veracrypt/VeraCrypt/security/advisories/GHSA-4j3p-7hp7-xw73","label":"https://github.com/veracrypt/VeraCrypt/security/advisories/GHSA-4j3p-7hp7-xw73"},{"url":"https://github.com/veracrypt/VeraCrypt/commit/fb9d96c52dace4d34c5427402b512e8de5f832d6","label":"https://github.com/veracrypt/VeraCrypt/commit/fb9d96c52dace4d34c5427402b512e8de5f832d6"},{"url":"https://github.com/veracrypt/VeraCrypt/releases/tag/VeraCrypt_1.26.30","label":"https://github.com/veracrypt/VeraCrypt/releases/tag/VeraCrypt_1.26.30"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T21:36:00.665Z","epss":0.00098,"epssPercentile":0.00776,"slug":"CVE-2026-77372","body":"## Overview\n\nVeraCrypt provides disk encryption with strong security based on TrueCrypt. Prior to 1.26.30, the Unix, macOS, and FreeBSD serialization paths in src/Platform/Serializer.cpp and src/Volume/VolumePassword.cpp accept untrusted length and count values when deserializing data that can cross from the unprivileged GUI or CLI to the root CoreService helper. Serializer::DeserializeWString allocates floor(size / sizeof(wchar_t)) elements but reads size bytes, so a non-aligned size can overflow the heap allocation. VolumePassword::Deserialize accepts PasswordSize values larger than the fixed 128-byte PasswordBuffer, allowing downstream DataPtr() and Size() consumers such as the KDF to read beyond the buffer. DeserializeString, DeserializeWString, and the string and wide-string list readers also lack allocation and collection bounds, which can exhaust memory, and a zero-length DeserializeString can access an empty vector. Windows uses a different path, and the immediate CoreService pipe writer is the same-user parent process, so the documented exposure is a local defense-in-depth boundary rather than a remote attack. This issue is fixed in 1.26.30.\n\n## Affected\n\n- `VeraCrypt < 1.26.30`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}