CVE-2026-26994

MEDIUM
中文标题:
（暂无数据）
英文标题:
uTLS ServerHellos are accepted without checking TLS 1.3 downgrade canaries
CVSS分数: 6.5
发布时间: 2026-02-20 02:50:18
漏洞类型: （暂无数据）
状态: PUBLISHED
数据质量分数: 0.30
数据版本: v2
漏洞描述
中文描述:

（暂无数据）

英文描述:

uTLS is a fork of crypto/tls, created to customize ClientHello for fingerprinting resistance while still using it for the handshake. In versions 1.6.7 and below, uTLS did not implement the TLS 1.3 downgrade protection mechanism specified in RFC 8446 Section 4.1.3 when using a uTLS ClientHello spec. This allowed an active network adversary to downgrade TLS 1.3 connections initiated by a uTLS client to a lower TLS version (e.g., TLS 1.2) by modifying the ClientHello message to exclude the SupportedVersions extension, causing the server to respond with a TLS 1.2 ServerHello (along with a downgrade canary in the ServerHello random field). Because uTLS did not check the downgrade canary in the ServerHello random field, clients would accept the downgraded connection without detecting the attack. This attack could also be used by an active network attacker to fingerprint uTLS connections. This issue has been fixed in version 1.7.0.

CWE类型:
CWE-693
标签:
（暂无数据）
受影响产品
厂商 产品 版本 版本范围 平台 CPE
refraction-networking utls < 1.7.0 - - cpe:2.3:a:refraction-networking:utls:<_1.7.0:*:*:*:*:*:*:*
refraction-networking utls * - - cpe:2.3:a:refraction-networking:utls:*:*:*:*:*:go:*:*
解决方案
中文解决方案:
（暂无数据）
英文解决方案:
（暂无数据）
临时解决方案:
（暂无数据）
参考链接
https://github.com/refraction-networking/utls/security/advisories/GHSA-pmc3-p9hx-jq96 x_refsource_CONFIRM
cve.org
访问
https://github.com/refraction-networking/utls/issues/181 x_refsource_MISC
cve.org
访问
https://github.com/refraction-networking/utls/pull/337 x_refsource_MISC
cve.org
访问
https://github.com/refraction-networking/utls/commit/f8892761e2a4d29054264651d3a86fda83bc83f9 x_refsource_MISC
cve.org
访问
CVSS评分详情
3.1 (cna)
MEDIUM
6.5
CVSS向量: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
机密性
LOW
完整性
LOW
可用性
NONE
时间信息
发布时间:
2026-02-20 02:50:18
修改时间:
2026-02-20 15:12:28
创建时间:
2026-02-21 06:00:02
更新时间:
2026-02-21 06:00:05
利用信息
暂无可利用代码信息
数据源详情
数据源 记录ID 版本 提取时间
CVE cve_CVE-2026-26994 2026-02-21 03:19:38 2026-02-20 22:00:02
NVD nvd_CVE-2026-26994 2026-02-21 02:00:04 2026-02-20 22:00:05
版本与语言
当前版本: v2
主要语言: EN
支持语言:
EN
安全公告
暂无安全公告信息
变更历史
v2 NVD
2026-02-21 06:00:05
affected_products_count: 1 → 2; data_sources: ['cve'] → ['cve', 'nvd']
查看详细变更
  • affected_products_count: 1 -> 2
  • data_sources: ['cve'] -> ['cve', 'nvd']