RHSA-2026:6436
Vulnerability from csaf_redhat - Published: 2026-04-02 10:54 - Updated: 2026-04-02 23:41Summary
Red Hat Security Advisory: rsync security update
Severity
Moderate
Notes
Topic: An update for rsync is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The rsync utility enables the users to copy and synchronize files locally or across a network. Synchronization with rsync is fast because rsync only sends the differences in files over the network instead of sending whole files. The rsync utility is also used as a mirroring tool.
Security Fix(es):
* rsync: Rsync: Out of bounds array access via negative index (CVE-2025-10158)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
An out of bounds read flaw has been discovered in rsync. A malicious client acting as the receiver of an rsync file transfer can trigger an OOB read via a negative array index. The rsync client requires at least read access to the remote rsync module to trigger the issue.
4.3 (Medium)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:6436
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References
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"text": "An out of bounds read flaw has been discovered in rsync. A malicious client acting as the receiver of an rsync file transfer can trigger an OOB read via a negative array index. The rsync client requires at least read access to the remote rsync module to trigger the issue.",
"title": "Vulnerability description"
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"text": "rsync: Rsync: Out of bounds array access via negative index",
"title": "Vulnerability summary"
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"summary": "RHBZ#2415637",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2415637"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-10158",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-10158"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-10158",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-10158"
},
{
"category": "external",
"summary": "https://attackerkb.com/assessments/fbacb2a6-d1cd-4011-bb3a-f06b1c8306b1",
"url": "https://attackerkb.com/assessments/fbacb2a6-d1cd-4011-bb3a-f06b1c8306b1"
},
{
"category": "external",
"summary": "https://github.com/RsyncProject/rsync/commit/797e17fc4a6f15e3b1756538a9f812b63942686f",
"url": "https://github.com/RsyncProject/rsync/commit/797e17fc4a6f15e3b1756538a9f812b63942686f"
}
],
"release_date": "2025-11-18T14:24:19.210000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-02T10:54:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:6436"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "rsync: Rsync: Out of bounds array access via negative index"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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