CVE-2026-33818: CWE-400: Uncontrolled Resource Consumption in Go standard library encoding/asn1
CVE-2026-33818 is a vulnerability in the Go standard library's encoding/asn1 package where the Unmarshal function does not enforce a recursion limit. This can lead to uncontrolled resource consumption, specifically stack exhaustion, when parsing deeply nested or recursive ASN.1 structures. The issue affects multiple versions of the Go standard library prior to certain patch levels. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time.
AI Analysis
Technical Summary
This vulnerability involves the lack of a recursion limit in the Unmarshal function of the encoding/asn1 package in the Go standard library. Without such a limit, an attacker could craft deeply nested ASN.1 data structures that cause the parser to exhaust the stack, leading to denial of service due to uncontrolled resource consumption. The affected versions include =1.26.0-0, =1.27.0-0, <1.25.13, and >=1.26.0-0 <1.26.6. The vulnerability is categorized under CWE-400 (Uncontrolled Resource Consumption). No CVSS score or official remediation level is provided, and no patch links are available.
Potential Impact
The primary impact is denial of service through stack exhaustion when parsing maliciously crafted ASN.1 data. This could cause applications using the affected Go encoding/asn1 package to crash or become unresponsive. There is no indication of code execution or data breach from the provided information. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting or validating ASN.1 input depth in their applications as a temporary mitigation. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-33818: CWE-400: Uncontrolled Resource Consumption in Go standard library encoding/asn1
Description
CVE-2026-33818 is a vulnerability in the Go standard library's encoding/asn1 package where the Unmarshal function does not enforce a recursion limit. This can lead to uncontrolled resource consumption, specifically stack exhaustion, when parsing deeply nested or recursive ASN.1 structures. The issue affects multiple versions of the Go standard library prior to certain patch levels. No official patch or remediation guidance is currently provided by the vendor. There are no known exploits in the wild at this time.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves the lack of a recursion limit in the Unmarshal function of the encoding/asn1 package in the Go standard library. Without such a limit, an attacker could craft deeply nested ASN.1 data structures that cause the parser to exhaust the stack, leading to denial of service due to uncontrolled resource consumption. The affected versions include =1.26.0-0, =1.27.0-0, <1.25.13, and >=1.26.0-0 <1.26.6. The vulnerability is categorized under CWE-400 (Uncontrolled Resource Consumption). No CVSS score or official remediation level is provided, and no patch links are available.
Potential Impact
The primary impact is denial of service through stack exhaustion when parsing maliciously crafted ASN.1 data. This could cause applications using the affected Go encoding/asn1 package to crash or become unresponsive. There is no indication of code execution or data breach from the provided information. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting or validating ASN.1 input depth in their applications as a temporary mitigation. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Go
- Date Reserved
- 2026-03-23T20:35:32.815Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7e412ebf8831d539e05113
Added to database: 08/13/2026, 22:11:58 UTC
Last enriched: 08/13/2026, 22:28:06 UTC
Last updated: 08/13/2026, 23:21:45 UTC
Views: 5
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