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Vulnerability Details :

CVE-2026-45232

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-20 May, 2026 | 00:45
Updated At-20 May, 2026 | 17:31
Rejected At-
Credits

Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:20 May, 2026 | 00:45
Updated At:20 May, 2026 | 17:31
Rejected At:
▼CVE Numbering Authority (CNA)
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy

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.

Affected Products
Vendor
RsyncProject
Product
rsync
Repo
https://github.com/RsyncProject/rsync
Default Status
unaffected
Versions
Affected
  • From 0 before 3.4.3 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-193Off-by-one Error
Type: CWE
CWE ID: CWE-193
Description: Off-by-one Error
Metrics
VersionBase scoreBase severityVector
4.02.1LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.13.1LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Version: 4.0
Base score: 2.1
Base severity: LOW
Vector:
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Version: 3.1
Base score: 3.1
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Michal Ruprich
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8
vendor-advisory
https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
release-notes
https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy
third-party-advisory
Hyperlink: https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8
Resource:
vendor-advisory
Hyperlink: https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
Resource:
release-notes
Hyperlink: https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:20 May, 2026 | 02:16
Updated At:21 May, 2026 | 20:52

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.02.1LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.13.1LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Primary3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Type: Secondary
Version: 4.0
Base score: 2.1
Base severity: LOW
Vector:
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 3.1
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Type: Primary
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CPE Matches
Samba
samba
>>rsync>>Versions before 3.4.3(exclusive)
cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-193Primarydisclosure@vulncheck.com
CWE ID: CWE-193
Type: Primary
Source: disclosure@vulncheck.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/RsyncProject/rsync/releases/tag/v3.4.3disclosure@vulncheck.com
Release Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8disclosure@vulncheck.com
Vendor Advisory
https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxydisclosure@vulncheck.com
Third Party Advisory
Hyperlink: https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
Source: disclosure@vulncheck.com
Resource:
Release Notes
Hyperlink: https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8
Source: disclosure@vulncheck.com
Resource:
Vendor Advisory
Hyperlink: https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy
Source: disclosure@vulncheck.com
Resource:
Third Party Advisory

Change History

0
Information is not available yet

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