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CVE-2026-43618

8.1 · HIGH

Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to tri…

Published May 20, 2026CWE-125EPSS 0.80%

Overview

CVE-2026-43618 is a high-severity vulnerability. It was published on May 20, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/RsyncProject/rsync/releases/tag/v3.4.3GitHubgithub.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwqRefwww.vulncheck.com/advisories/rsync-integer-overflow-information-disclosureRefaccess.redhat.com/errata/RHSA-2026:26332Refaccess.redhat.com/errata/RHSA-2026:26408Refaccess.redhat.com/errata/RHSA-2026:26410Refaccess.redhat.com/errata/RHSA-2026:29197Refaccess.redhat.com/security/cve/CVE-2026-43618Refbugzilla.redhat.com/show_bug.cgi?id=2469054Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43618.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43618?

CVE-2026-43618 is a high-severity vulnerability. It was published on May 20, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-43618?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43618?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43618?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43618 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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