CVE-2026-56859— Add recursion depth guard during decode in encoding/xml
Quick assessment
Affected
Go standard library encoding/xml
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Google公司开源的一款支持并发编程的脚本语言。 Google Go 1.25.13之前版本、1.26.6之前版本和1.27.0-rc.3之前版本存在资源管理错误漏洞，该漏洞源于DecodeElement重置深度计数器导致其无法触发，可能造成栈耗尽。
Possible ATT&CK Techniques 1 AI
T1211 · Exploitation for StealthAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go standard library | encoding/xml | < 1.25.13 |
affected |
1.26.0-0< 1.26.6 |
affected | ||
1.27.0-0< 1.27.0-rc.3 |
affected |
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I. Basic Information for CVE-2026-56859
Vulnerability Information
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Vulnerability Title
Add recursion depth guard during decode in encoding/xml
Source: CVE Program / CVE List V5
Vulnerability Description
Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.
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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国Google公司开源的一款支持并发编程的脚本语言。 Google Go 1.25.13之前版本、1.26.6之前版本和1.27.0-rc.3之前版本存在资源管理错误漏洞，该漏洞源于DecodeElement重置深度计数器导致其无法触发，可能造成栈耗尽。
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 | encoding/xml | 0 ~ 1.25.13 | - |
|
II. Public POCs for CVE-2026-56859
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-56859 (1)
Vendor Advisories for CVE-2026-56859 (2)
Vendor Pages for CVE-2026-56859 (1)
Same Patch Batch · Go standard library · 2026-08-13 · 6 CVEs total
| CVE-2026-56862 | Limit handshake messages we are willing to accept post-handshake in crypto/tls | |
| CVE-2026-56858 | Fix Javascript regexp context tracking in html/template | |
| CVE-2026-56853 | Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http | |
| CVE-2026-56860 | Avoid quadratic complexity in resolvePath in net/url | |
| CVE-2026-33818 | Enforce maximum recursion depth in encoding/asn1 |
IV. Related Vulnerabilities
Same vendor: Go standard library
-
CVE-2026-56860
Avoid quadratic complexity in resolvePath in net/url -
CVE-2026-56862
Limit handshake messages we are willing to accept post-hands -
CVE-2026-33818
Enforce maximum recursion depth in encoding/asn1 -
CVE-2026-56858
Fix Javascript regexp context tracking in html/template -
CVE-2026-56853
Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check
V. Comments for CVE-2026-56859
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