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Vulnerabilities

Vulnerability · CVE-2026-56859

Add recursion depth guard during decode in encoding/xml

Published Aug 13, 2026 · catalog updated Oct 20, 2026 · Add recursion depth guard

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-56859. EPSS is 0.57%. Act only if a listed version of Add recursion depth guard is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Add recursion depth guard).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.57%
Remediation
Not established
Affected products
Go stdlib

Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Go stdlib0 → 1.25.13

How to fix CVE-2026-56859

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-56859. EPSS is 0.57%. Act only if a listed version of Add recursion depth guard is installed.

Which versions are affected?

Compare what you have installed with 0 → 1.25.13. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.57%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 13, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

  2. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    stdlib fixed in 1.25.13

  3. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    stdlib fixed in 1.25.13

  4. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

Sources

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • BSI CERT-BundOct 27, 2026
  • Go Vulnerability DatabaseOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • OpenSSF OSV / OSV ScannerOct 20, 2026