CVE-2026-32281— Inefficient policy 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，该漏洞源于验证使用策略的证书链时效率低下，可能导致拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-32281
Vulnerability Information
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Vulnerability Title
Inefficient policy validation in crypto/x509
Source: CVE Program / CVE List V5
Vulnerability Description
Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
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，该漏洞源于验证使用策略的证书链时效率低下，可能导致拒绝服务。
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 ~ 1.25.9 | - |
|
II. Public POCs for CVE-2026-32281
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-32281 (2)
Same Patch Batch · Go standard library · 2026-04-08 · 7 CVEs total
| CVE-2026-32282 | TOCTOU permits root escape on Linux via Root.Chmod in os in internal/syscall/unix | |
| CVE-2026-32280 | Unexpected work during chain building in crypto/x509 | |
| CVE-2026-32288 | Unbounded allocation for old GNU sparse in archive/tar | |
| CVE-2026-32289 | JsBraceDepth Context Tracking Bugs (XSS) in html/template | |
| CVE-2026-32283 | Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS | |
| CVE-2026-33810 | Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509 |
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-2026-33810
Case-sensitive excludedSubtrees name constraints cause Auth -
CVE-2026-27138
Panic in name constraint checking for malformed certificates -
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-2026-33818
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 -
CVE-2026-56858
Fix Javascript regexp context tracking in html/template
V. Comments for CVE-2026-32281
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