CVE-2026-33524: CWE-789: Memory Allocation with Excessive Size Value in ndsev zserio
Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.
AI Analysis
Technical Summary
The vulnerability CVE-2026-33524 in ndsev zserio (versions before 2.18.1) is classified as CWE-789: Memory Allocation with Excessive Size Value. A specially crafted small payload can cause the software to allocate an excessively large amount of memory (up to 16 GB), leading to process crashes from OOM conditions. This vulnerability can be exploited remotely without authentication and requires no user interaction. The CVSS v3.1 base score is 7.5, reflecting a high severity denial of service impact with no confidentiality or integrity impact. The vulnerability is resolved in zserio version 2.18.1.
Potential Impact
Exploitation of this vulnerability results in a denial of service by crashing the affected process due to excessive memory allocation. There is no impact on confidentiality or integrity. The vulnerability can be triggered remotely without privileges or user interaction, making it a significant availability risk for systems using vulnerable versions of zserio.
Mitigation Recommendations
A fix is available in ndsev zserio version 2.18.1. Users and administrators should upgrade to version 2.18.1 or later to remediate this vulnerability. Since the vendor advisory confirms the fix in 2.18.1, applying this official update is the recommended mitigation. No additional temporary workarounds or mitigations are indicated.
CVE-2026-33524: CWE-789: Memory Allocation with Excessive Size Value in ndsev zserio
Description
Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-33524 in ndsev zserio (versions before 2.18.1) is classified as CWE-789: Memory Allocation with Excessive Size Value. A specially crafted small payload can cause the software to allocate an excessively large amount of memory (up to 16 GB), leading to process crashes from OOM conditions. This vulnerability can be exploited remotely without authentication and requires no user interaction. The CVSS v3.1 base score is 7.5, reflecting a high severity denial of service impact with no confidentiality or integrity impact. The vulnerability is resolved in zserio version 2.18.1.
Potential Impact
Exploitation of this vulnerability results in a denial of service by crashing the affected process due to excessive memory allocation. There is no impact on confidentiality or integrity. The vulnerability can be triggered remotely without privileges or user interaction, making it a significant availability risk for systems using vulnerable versions of zserio.
Mitigation Recommendations
A fix is available in ndsev zserio version 2.18.1. Users and administrators should upgrade to version 2.18.1 or later to remediate this vulnerability. Since the vendor advisory confirms the fix in 2.18.1, applying this official update is the recommended mitigation. No additional temporary workarounds or mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-20T18:05:11.829Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ebb81d87115cfb68646f6a
Added to database: 4/24/2026, 6:36:13 PM
Last enriched: 4/24/2026, 6:51:31 PM
Last updated: 4/25/2026, 5:45:21 AM
Views: 10
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.