CVE-2025-61729— Excessive resource consumption when printing error string for host certificate validation in crypto/x509
Quick assessment
Affected
Go standard library crypto/x509
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.
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于包crypto/x509中的HostnameError.Error函数构造错误字符串时未限制主机数量，可能导致资源过度消耗。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-61729
Vulnerability Information
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Vulnerability Title
Excessive resource consumption when printing error string for host certificate validation in crypto/x509
Source: CVE Program / CVE List V5
Vulnerability Description
Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于包crypto/x509中的HostnameError.Error函数构造错误字符串时未限制主机数量，可能导致资源过度消耗。
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 |
|---|---|---|---|---|
| Go standard library | crypto/x509 | 0 ~ 1.24.11 | - |
|
II. Public POCs for CVE-2025-61729
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: crypto/x509
-
CVE-2026-27145
Inefficient candidate hostname parsing in crypto/x509 -
CVE-2026-32280
Unexpected work during chain building in crypto/x509 -
CVE-2026-32281
Inefficient policy validation in crypto/x509 -
CVE-2026-33810
Case-sensitive excludedSubtrees name constraints cause Auth -
CVE-2026-27137
Incorrect enforcement of email constraints in crypto/x509
Same vendor: Go standard library
-
CVE-2026-56860
Avoid quadratic complexity in resolvePath in net/url -
CVE-2026-56853
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check -
CVE-2026-33818
Enforce maximum recursion depth in encoding/asn1 -
CVE-2026-56859
Add recursion depth guard during decode in encoding/xml -
CVE-2026-56862
Limit handshake messages we are willing to accept post-hands
V. Comments for CVE-2025-61729
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