---
id: CVE-2025-67901
title: >-
  openrsync through 0.5.0, as used in OpenBSD through 7.8 and on other
  platforms, allows a client to cause a server SIGSEGV by specifying a length of
  zero for block data, because the relationship between p->rem and p->len is not
  checked.
summary: >-
  openrsync through 0.5.0, as used in OpenBSD through 7.8 and on other
  platforms, allows a client to cause a server SIGSEGV by specifying a length of
  zero for block data, because the relationship between p->rem and p->len is not
  checked.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1284
published: '2025-12-15'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:10:00.160'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-67901'
references:
  - url: 'https://github.com/kristapsdz/openrsync/issues/34'
    label: cve@mitre.org
  - url: >-
      https://github.com/openbsd/src/blob/60b9c3dff1abf933e85e3c4d96b54201ee947513/usr.bin/rsync/blocks.c#L480-L481
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00283
epssPercentile: 0.18986
ingestedAt: '2026-10-07T19:44:15.673Z'
---

## Overview

openrsync through 0.5.0, as used in OpenBSD through 7.8 and on other platforms, allows a client to cause a server SIGSEGV by specifying a length of zero for block data, because the relationship between p->rem and p->len is not checked.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.