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CVE-2026-39892— cryptography has a buffer overflow if non-contiguous buffers were passed to APIs

Quick assessment

Affected
pyca cryptography
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.

cryptography是Python Cryptographic Authority开源的一个Python的加密库。 cryptography 45.0.0至46.0.7之前版本存在安全漏洞，该漏洞源于缓冲区处理不当，可能导致缓冲区溢出。

CVSS 6.9 · Medium EPSS 0.65% · P48

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
pyca cryptography >= 45.0.0, < 46.0.7 affected
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I. Basic Information for CVE-2026-39892

Vulnerability Information
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Vulnerability Title
cryptography has a buffer overflow if non-contiguous buffers were passed to APIs
Source: CVE Program / CVE List V5
Vulnerability Description
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cryptography 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cryptography是Python Cryptographic Authority开源的一个Python的加密库。 cryptography 45.0.0至46.0.7之前版本存在安全漏洞，该漏洞源于缓冲区处理不当，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pyca cryptography >= 45.0.0, < 46.0.7 -

II. Public POCs for CVE-2026-39892

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III. Intelligence Information for CVE-2026-39892

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IV. Related Vulnerabilities

Same product: cryptography
Same vendor: pyca
Same weakness: CWE-119

V. Comments for CVE-2026-39892

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