Application crash via reset recursion counter
Published Aug 13, 2026 · Updated Aug 13, 2026
Resource exhaustion in Google Go encoding/xml allows remote attackers to crash affected applications through deeply nested XML. DecodeElement resets the decoder's recursion-depth counter during nested unmarshaling, so the existing guard never reaches its limit and recursive calls exhaust the goroutine stack. Exposure requires an application to pass attacker-controlled XML through an affected decoding symbol; the reported consequence is process termination, not data access or modification.
Summary
What happened
Resource exhaustion in Google Go encoding/xml allows remote attackers to crash affected applications through deeply nested XML. DecodeElement resets the decoder's recursion-depth counter during nested unmarshaling, so the existing guard never reaches its limit and recursive calls exhaust the goroutine stack. Exposure requires an application to pass attacker-controlled XML through an affected decoding symbol; the reported consequence is process termination, not data access or modification.
The record
- CVE
- CVE-2026-56859
- Published
- Aug 13, 2026
- Updated
- Aug 13, 2026
- Vendor
- Go standard library
- Product
- encoding/xml
- Classifications
- CWE-770, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2026CVE publishedPublication date reported by the CVE source.
- Aug 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <1.25.13
- Affected versionversion=1.26.0-0 <1.26.6
- Affected versionversion=1.27.0-0 <1.27.0-rc.3
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What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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