Is CVE-2026-43620 in the CISA KEV catalog?

No. CVE-2026-43620 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43620?

CVE-2026-43620 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-43620?

CVE-2026-43620 has an EPSS score of 0.50% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43620?

Upgrade rsync on debian 11 to 3.2.3-4+deb11u4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-43620

MEDIUM

6.5

CVSS v3

NVD

Description

Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

rsyncDebian

Fixed in:3.2.3-4+deb11u4CVE-2026-43620

Fixed in:3.2.7-1+deb12u5CVE-2026-43620

Fixed in:3.4.1+ds1-5+deb13u3CVE-2026-43620

Fixed in:3.4.3+ds1-1CVE-2026-43620

rsyncUbuntu

Fixed in:3.1.0-2ubuntu0.4+esm3USN-8349-1

Fixed in:3.1.1-3ubuntu1.3+esm5USN-8349-1

Fixed in:3.1.2-2.1ubuntu1.6+esm3USN-8349-1

Fixed in:3.1.3-8ubuntu0.9+esm1USN-8349-1

Fixed in:3.2.7-0ubuntu0.22.04.6USN-8283-1

Fixed in:3.2.7-1ubuntu1.4USN-8283-1

Fixed in:3.4.1+ds1-5ubuntu1.2USN-8283-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.50%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Vendor Advisory1

github.com

Third-Party Advisory1

vulncheck.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-21.