CVE-2026-42768— OpenSSL 安全漏洞
一分钟漏洞结论
影响对象
OpenSSL OpenSSL
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于CMS_decrypt和PKCS7_decrypt函数易受Bleichenbacher风格攻击，可能导致解密或签名消息。
可能的 ATT&CK 技术 1 AI
T1408.002
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一、 漏洞 CVE-2026-42768 基础信息
漏洞信息
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Vulnerability Title
Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()
来源: CVE Program / CVE List V5
Vulnerability Description
Issue summary: The CMS_decrypt and PKCS7_decrypt functions are vulnerable to
Bleichenbacher-style attack when an attacker is able to provide the CMS or
S/MIME messages and observe the error code and/or decryption output.
Impact summary: The Bleichenbacher-style attack allows an attacker to use the
victim's vulnerable application as a way to decrypt or sign messages with the
victim's private RSA key.
The attack is possible in 2 variants.
1. The decryption API (CMS_decrypt(), PKCS7_decrypt()) is used without
providing the recipient certificate. In this case OpenSSL iterates over every
KeyTransRecipientInfo (KTRI) without stopping at the first success.
An attacker who authors a message with two KTRI entries — the first one
wrapping a real CEK under the victim's public key, the second with an
arbitrary probe ciphertext — obtains opportunity to iterate the 2nd KTRI to
get a valid PKCS#1 v1.5 padding if the error code of the application is
available.
That is a Bleichenbacher oracle (Bleichenbacher, CRYPTO '98): an
adaptive-chosen-ciphertext side channel from which the attacker decrypts any
RSA ciphertext to the victim's key or forges any PKCS#1 v1.5 signature under
it.
2. When the decryption API (CMS_decrypt(), PKCS7_decrypt()) is provided with
the recipient certificate, and the recipient is not found, a random
key is substituted.
An attacker who authors a message and is able to compare both error code and
the result of the decryption, can mount a Bleichenbacher oracle.
We are not aware of any applications that provide a remote attacker
an opportunity to mount an attack described in these scenarios. We consider
the existence of such application very unlikely, and for this reason this
CVE has been evaluated as Low severity.
To avoid these attacks, when RSA PKCS#1 v1.5 Key Transport is in use, the
invoked EVP_PKEY_decrypt() will use the implicit rejection mechanism described
in draft-irtf-cfrg-rsa-guidance. In previous OpenSSL releases the implicit
rejection was explicitly disabled.
The implicit rejection mechanism always returns a plaintext value,
the symmetric key. This result is deterministic for the ciphertext and the
private key. The length of the decryption result can happen to match the
length of the key of the symmetric cipher that was used for the content
encryption. When a certificate is not provided, the last RecipientInfo
producing a key that looks valid will be used. It may cause getting garbage
content on decryption. As a proper way to deal with this a recipient
certificate has to be provided to identify the particular RecipientInfo for
decryption.
The FIPS modules in 4.0, 3.6, 3.5, and 3.4 are not affected by this issue, as
CMS and S/MIME processing happens outside the OpenSSL FIPS module boundary.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
隐蔽通道
来源: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于CMS_decrypt和PKCS7_decrypt函数易受Bleichenbacher风格攻击，可能导致解密或签名消息。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-42768 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-42768 补丁与修复 (4)
CVE-2026-42768 厂商安全公告 (1)
同批安全公告 · OpenSSL · 2026-06-09 · 共 18 条
| CVE-2026-45445 | OpenSSL 安全漏洞 | |
| CVE-2026-34183 | OpenSSL 安全漏洞 | |
| CVE-2026-34181 | OpenSSL 安全漏洞 | |
| CVE-2026-34180 | OpenSSL 缓冲区错误漏洞 | |
| CVE-2026-34182 | OpenSSL 安全漏洞 | |
| CVE-2026-9076 | OpenSSL 缓冲区错误漏洞 | |
| CVE-2026-35188 | OpenSSL 资源管理错误漏洞 | |
| CVE-2026-7383 | OpenSSL 缓冲区错误漏洞 | |
| CVE-2026-45446 | OpenSSL 安全漏洞 | |
| CVE-2026-42771 | OpenSSL 缓冲区错误漏洞 | |
| CVE-2026-45447 | OpenSSL 资源管理错误漏洞 | |
| CVE-2026-42769 | OpenSSL 信任管理问题漏洞 | |
| CVE-2026-42767 | OpenSSL 代码问题漏洞 | |
| CVE-2026-42766 | OpenSSL 代码问题漏洞 | |
| CVE-2026-42764 | OpenSSL 代码问题漏洞 | |
| CVE-2026-42770 | OpenSSL 安全漏洞 | |
| CVE-2026-42765 | OpenSSL 代码问题漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-42768
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