CVE-2026-63074— ExtraCerts 无限缓存增长漏洞
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 证书管理协议（CMP）会缓存 CMP 消息中发送的附加证书（extraCerts），但从未将其清除（例如，即使这些证书无效）。如果服务器频繁重用同一个 上下文，这个 extraCerts 缓存可能会无限制增长，恶意客户端可能通过向 CMP 服务器发送大量请求来驱动这种增长。 影响摘要：对于在其服务器进程生命周期内重用单个 的 CMP 服务器用户，如果恶意客户端反复发送包含不同附加证书的请求，可能会导致内存无限增长，进而引发内存不足（OOM）状况。 CWE：CWE-770：未限制或未限速地分
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service
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一、 漏洞 CVE-2026-63074 基础信息
漏洞信息
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Vulnerability Title
CMP Indefinite Cache Growth of ExtraCerts
来源: CVE Program / CVE List V5
Vulnerability Description
Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches
additional certificates (extraCerts) sent in a CMP message, but never expunges
them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX
frequently, this cache of extraCerts may grow unboundedly, and a malicious
client may flood a CMP server with requests driving this growth.
Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX
for the lifetime of a server process may observe unbounded memory growth in the
event a malicious client repeatedly sends requests containing unique extra
certificates, which may lead to OOM conditions.
CWE: CWE-770: Allocation of Resources Without Limits or Throttling
Description: If a remote user sends CMP messages to a server with a list of
extraCerts and the message is rejected, the extraCerts from the message remains
in the server contexts untrusted certificate stack. This exposes servers with
long lived ctx objects to Denial of Service attacks in which an attacker sends
messages intending to be rejected with a large list of additional certificates
repeatedly, forcing the server to store them indefinitely.
The issue was fixed by removing the added extra certs if the message is
rejected, using the same method as when the context is configured to not do
caching at all.
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
不加限制或调节的资源分配
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-63074 的公开POC
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CVE-2026-63074 补丁与修复 (5)
CVE-2026-63074 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-2026-63072 | 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-2026-63076 | CMP Server 保护算法构造指针解引用漏洞 | |
| 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-2026-63074
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