CVE-2026-45447

描述

Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition. In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution. Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

如何修補 CVE-2026-45447

要修補 CVE-2026-45447,請將受影響套件升級到下列已修補版本。

• —升級至 3.5.7-r0 或更新版本
• —未列出修補版本

CVE-2026-45447 正在被利用嗎?

目前沒有被利用訊號。CVE-2026-45447 既不在 CISA KEV 也沒有最新的 EPSS 分數。

受影響套件(2)

• from 0, < 3.5.7-r0
• from 0

CVSS 分數

參考連結(2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2026-45447
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-45447