CVE & CISA-KEV Catalog

CVE-2026-45232

LOW
3.1
CVSS v3
NVD

Description

Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.

CWE-193

How to fix

Remediation Available
rsyncDebian
Fixed in:3.4.3+ds1-1CVE-2026-45232
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 ComplexityHigh
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityLow

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

Exploit Intelligence

0.34%probability of exploitation in 30 days
26thpercentile

Low risk: more likely to be exploited than 26% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1
Release Notes1
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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.