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CVE-2026-28390— Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo

Quick assessment

Affected
OpenSSL OpenSSL
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.

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，该漏洞源于处理特制的使用KeyTransportRecipientInfo的CMS EnvelopedData消息时可能导致空指针取消引用，可能导致应用程序崩溃和拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.80% · P55

Affected Version Matrix 7

VendorProduct Version RangeStatus
OpenSSL OpenSSL 3.6.0< 3.6.2 affected
3.5.0< 3.5.6 affected
3.4.0< 3.4.5 affected
3.3.0< 3.3.7 affected
3.0.0< 3.0.20 affected
1.1.1< 1.1.1zg affected
1.0.2< 1.0.2zp affected
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I. Basic Information for CVE-2026-28390

Vulnerability Information
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Vulnerability Title
Possible NULL Dereference When Processing CMS KeyTransportRecipientInfo
Source: CVE Program / CVE List V5
Vulnerability Description
Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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，该漏洞源于处理特制的使用KeyTransportRecipientInfo的CMS EnvelopedData消息时可能导致空指针取消引用，可能导致应用程序崩溃和拒绝服务。
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
OpenSSL OpenSSL 3.6.0 ~ 3.6.2 -

II. Public POCs for CVE-2026-28390

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III. Intelligence Information for CVE-2026-28390

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Patches & Fixes for CVE-2026-28390 (4)

Vendor Advisories for CVE-2026-28390 (1)

Same Patch Batch · OpenSSL · 2026-04-07 · 7 CVEs total

CVE-2026-31789 Heap Buffer Overflow in Hexadecimal Conversion
CVE-2026-31790 Incorrect Failure Handling in RSA KEM RSASVE Encapsulation
CVE-2026-28388 NULL Pointer Dereference When Processing a Delta CRL
CVE-2026-28387 Potential Use-after-free in DANE Client Code
CVE-2026-28386 Out-of-bounds Read in AES-CFB-128 on X86-64 with AVX-512 Support
CVE-2026-28389 Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL
Same weakness: CWE-476

V. Comments for CVE-2026-28390

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