CVE-2026-77696— Timing Side-Channel in SM2 Signature Generation
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。
Issue summary: SM2 signature generation uses non-constant-time arithmetic on secret values, forming a timing side-channel. Impact summary: An attacker able to measure SM2 signing times may learn information about the per-signature secret nonce, which over many
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一、 漏洞 CVE-2026-77696 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Timing Side-Channel in SM2 Signature Generation
来源: CVE Program / CVE List V5
Vulnerability Description
Issue summary: SM2 signature generation uses non-constant-time arithmetic
on secret values, forming a timing side-channel.
Impact summary: An attacker able to measure SM2 signing times may learn
information about the per-signature secret nonce, which over many signatures
can, via a lattice / Hidden Number Problem attack, lead to recovery of the
private key.
CWE: CWE-208: Observable Timing Discrepancy
Description: SM2 signature generation computes the signature value using
variable-time BIGNUM operations on the secret nonce and the private key, so
the time taken to produce an SM2 signature depends on these secret values,
forming a timing side-channel.
Applications performing SM2 signature generation are affected on all
platforms.
FIPS Impact: no
SM2 is not a FIPS algorithm.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-77696 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-77696 其他参考 (5)
-
https://openssl-library.org/news/secadv/20260929.txt vendor-advisory
同批安全公告 · OpenSSL · 2026-09-29 · 共 14 条
| CVE-2026-35189 | Excessive Memory Allocation in Relative CRLDP Processing | |
| CVE-2026-35191 | QUIC Unvalidated Amplification Credit may be Over Accounted | |
| CVE-2026-75806 | Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes DoS | |
| CVE-2026-75804 | QUIC Connection-Level Flow Control is Not Enforced for Streams | |
| CVE-2026-75805 | NULL Pointer Dereference in CMP Client Revocation Response Handling | |
| CVE-2026-42772 | Potential CPU DoS via O(n^2) Fragment Reassembly in QUIC | |
| CVE-2026-54873 | QUIC STREAM Fragment Metadata DoS | |
| CVE-2026-54872 | Timing Side-Channel in Scalar Multiplication for Non-NIST EC Curves | |
| CVE-2026-54875 | Non-Constant-Time SM2 Scalar Multiplication on ARM64 and RISC-V | |
| CVE-2026-72897 | Out-of-Bounds Access After SSL_set_SSL_CTX() During a Handshake | |
| CVE-2026-84782 | DTLS Retransmits Handshake Messages From a Stale Buffer Offset | |
| CVE-2026-84784 | QUIC: Unbounded RETIRE_CONNECTION_ID Backlog | |
| CVE-2026-84783 | Use-After-Free in X.509 Extension Cache Under Concurrent Use |
IV. Related Vulnerabilities
Same product: OpenSSL
-
CVE-2026-84784
QUIC: Unbounded RETIRE_CONNECTION_ID Backlog -
CVE-2026-84783
Use-After-Free in X.509 Extension Cache Under Concurrent Use -
CVE-2026-84782
DTLS Retransmits Handshake Messages From a Stale Buffer Offs -
CVE-2026-75806
Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes D -
CVE-2026-75805
NULL Pointer Dereference in CMP Client Revocation Response H
Same vendor: OpenSSL
-
CVE-2026-84784
QUIC: Unbounded RETIRE_CONNECTION_ID Backlog -
CVE-2026-84783
Use-After-Free in X.509 Extension Cache Under Concurrent Use -
CVE-2026-84782
DTLS Retransmits Handshake Messages From a Stale Buffer Offs -
CVE-2026-75806
Unauthenticated and Undersized DTLS 1.2 AEAD Record Causes D -
CVE-2026-75805
NULL Pointer Dereference in CMP Client Revocation Response H
V. Comments for CVE-2026-77696
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