CVE-2026-63076— CMP Server 保护算法构造指针解引用漏洞
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。
问题摘要： OpenSSL 中基于 CMP（证书管理协议）的基于密码的保护验证机制存在缺陷。该验证逻辑仅检查 参数是否非 NULL，而未验证其 ASN.1 类型，随后便将其当作 处理。攻击者可构造特殊消息，其中包含类型不同的参数，导致程序将其解引用为无效指针，从而引发问题。 影响摘要： 远程、未认证的攻击者可使作为 CMP 服务器且接受基于密码保护（PBM）消息的应用程序崩溃，或使与恶意或中间人（MITM）攻击的 CMP 服务器进行通信的 CMP 客户端崩溃，从而导致拒绝服务（DoS）。 CWE： CWE-476：
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2026-63076 基础信息
漏洞信息
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Vulnerability Title
Invalid Pointer Dereference in CMP Server via Crafted protectionAlg
来源: CVE Program / CVE List V5
Vulnerability Description
Issue summary: OpenSSL CMP password based protection verification only
checks whether the protectionAlg parameter was not NULL and not its
ASN.1 type, before treating it as a PBMParameter. A crafted message can
contain a parameter of a different type, which is then dereferenced as an
invalid pointer.
Impact summary: A remote, unauthenticated attacker can crash an application
acting as a CMP server that accepts PBM-protected messages, or a CMP client
talking to a malicious or intercepted CMP server, resulting in a Denial of
Service.
CWE: CWE-476: NULL Pointer Dereference
Description: When verifying the password-based MAC protection of a CMP
message, OpenSSL library reads the protectionAlg algorithm parameter with
X509_ALGOR_get0(), which returns both the parameter type and its value
pointer. The value is then cast to an ASN1_STRING and treated as the
expected PBMParameter after only checking that pointer is not NULL. The
parameter type returned by X509_ALGOR_get0() was never consulted.
This happens during protection verification, before any MAC is computed, so
no knowledge of the PBM shared secret is required; the only precondition is
that PBM verification is reachable. On the server side this is reached from
OSSL_CMP_SRV_process_request() for any application that stands up a CMP
server accepting PBM-protected messages, and on the client side from CMP
response validation against a malicious or on-path (MITM) server. The
reliable consequence is a denial of service; there is no memory disclosure,
no controlled memory write, and no path to code execution. CMP is a
specialized feature that an application must explicitly enable.
FIPS impact: no
As the CMP code lives outside the FIPS module boundary, no FIPS modules
are affected by this CVE.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-63076 的公开POC
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CVE-2026-63076 补丁与修复 (5)
CVE-2026-63076 厂商安全公告 (1)
同批安全公告 · OpenSSL · 2026-08-25 · 共 9 条
| CVE-2026-75803 | EVP_Cipher()使用AEAD时空密文伪造漏洞 | |
| CVE-2026-18798 | QUIC Server 处理初始包时可能触发双重释放漏洞 | |
| CVE-2026-54874 | DTLS记录缓冲区过度内存使用漏洞 | |
| CVE-2026-63074 | ExtraCerts 无限缓存增长漏洞 | |
| CVE-2026-63072 | CMS 密钥解封装中的堆缓冲区溢出漏洞 | |
| CVE-2026-63073 | CMP响应验证中未信任的发送者DN被用作格式字符串漏洞 | |
| CVE-2026-63075 | QUIC ACK包保留可导致内存耗尽 | |
| CVE-2026-14457 | RPK 服务器签名算法选择可导致引用缺失证书的漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-63076
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