# CVE-2022-46149: capnproto: Cap'n Proto is a data interchange format and remote procedure call (RPC) system

CVE-2022-46149 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2022-46149, released November 30, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-46149
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0095
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 30, 2022

## Description

Cap'n Proto is a data interchange format and remote procedure call (RPC) system. Cap'n Proro prior to versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3, as well as versions of Cap'n Proto's Rust implementation prior to 0.13.7, 0.14.11, and 0.15.2 are vulnerable to out-of-bounds read due to logic error handling list-of-list. This issue may lead someone to remotely segfault a peer by sending it a malicious message, if the victim performs certain actions on a list-of-pointer type. Exfiltration of memory is possible if the victim performs additional certain actions on a list-of-pointer type. To be vulnerable, an application must perform a specific sequence of actions, described in the GitHub Security Advisory. The bug is present in inlined code, therefore the fix will require rebuilding dependent applications. Cap'n Proto has C++ fixes available in versions 0.7.1, 0.8.1, 0.9.2, and 0.10.3. The `capnp` Rust crate has fixes available in versions 0.13.7, 0.14.11, and 0.15.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | capnproto Debian 12.15 (bookworm) | 0.9.2-2 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |
| Linux | capnproto Debian 13.5 (trixie) | 0.9.2-2 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |
| Linux | capnproto Debian 14 | 0.9.2-2 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |
| Linux | rust-capnp Debian 12.15 (bookworm) | 0.14.11-1.1 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |
| Linux | rust-capnp Debian 13.5 (trixie) | 0.14.11-1.1 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |
| Linux | rust-capnp Debian 14 | 0.14.11-1.1 | [DEBIAN-CVE-2022-46149](https://patchblox.com/security/data/fix/linux/debian-cve-2022-46149.md) | Nov 30, 2022 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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