CVE-2026-42766

描述

Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present. An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service. Applications that process password-encrypted CMS messages may be 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-2026-42766

要修補 CVE-2026-42766,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-2026-42766 正在被利用嗎?

目前沒有被利用訊號。CVE-2026-42766 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-2026-42766
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2026-42766