# CVE-2024-56375: fort-validator: An integer underflow was discovered in Fort 1.6.3 and 1.6.4 before 1.6.5

CVE-2024-56375 is fixed in fort-validator on 1 platform, first by DEBIAN-CVE-2024-56375, released December 22, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-56375
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 22, 2024

## Description

An integer underflow was discovered in Fort 1.6.3 and 1.6.4 before 1.6.5. A malicious RPKI repository that descends from a (trusted) Trust Anchor can serve (via rsync or RRDP) a Manifest RPKI object containing an empty fileList. Fort dereferences (and, shortly afterwards, writes to) this array during a shuffle attempt, before the validation that would normally reject it when empty. This out-of-bounds access is caused by an integer underflow that causes the surrounding loop to iterate infinitely. Because the product is permanently stuck attempting to overshuffle an array that doesn't actually exist, a crash is nearly guaranteed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fort-validator Debian 13.5 (trixie) | 1.6.5-1 | [DEBIAN-CVE-2024-56375](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56375.md) | Dec 22, 2024 |
| Linux | fort-validator Debian 14 | 1.6.5-1 | [DEBIAN-CVE-2024-56375](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56375.md) | Dec 22, 2024 |

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Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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