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CVE-2026-77372— VeraCrypt: Heap overflow and out-of-bounds read in Serializable deserialization (elevated Core service input path)

Quick assessment

Affected
veracrypt VeraCrypt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VeraCrypt 基于 TrueCrypt 提供具备高强安全性的磁盘加密功能。在 1.26.30 版本之前，其 Unix、macOS 和 FreeBSD 平台在 和 中的序列化路径，在反序列化数据时接受了不可信的“长度”和“计数”参数。此类数据可能从非特权的图形界面（GUI）或命令行界面（CLI）传递至拥有 root 权限的 CoreService 辅助进程。 具体漏洞包括： 函数按 分配元素数量，却读取了 字节的原始数据。若 未对齐，将导致堆内存溢出。 函数允许 参数超过固定的 128 字节 ，致使下游依赖 和

CVSS 8.8 · High
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I. Basic Information for CVE-2026-77372

Vulnerability Information
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Vulnerability Title
VeraCrypt: Heap overflow and out-of-bounds read in Serializable deserialization (elevated Core service input path)
Source: CVE Program / CVE List V5
Vulnerability Description
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 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
veracrypt VeraCrypt < 1.26.30 -

II. Public POCs for CVE-2026-77372

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III. Intelligence Information for CVE-2026-77372

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Other References for CVE-2026-77372 (3)

IV. Related Vulnerabilities

Same product: VeraCrypt
Same vendor: veracrypt
Same weakness: CWE-125