Vulnerability-Lookup

RHSA-2026:99576

Vulnerability from csaf_redhat - Published: 2026-11-12 10:54 - Updated: 2026-11-12 11:35

Summary

Red Hat Security Advisory: rsync security update

Severity

Important

Notes

Topic: An update for rsync is now available for Red Hat Enterprise Linux 10.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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: Denial of Service via crafted checksums during delta transfer (CVE-2026-119741) 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.

CVE-2026-119741

A flaw was found in rsync. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending crafted checksum sequences during delta file transfers to a public rsync server. This flaw forces the server to perform excessive checksum computations across consecutive data offsets, leading to high CPU resource exhaustion that degrades or disrupts availability for legitimate users.

7.5 (High)


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

CWE-407 - Inefficient Algorithmic Complexity

Affected products

Fixed 15 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z.E2S:rsync-daemon-0:3.5.0-3.el10_2.1.noarch	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z.E2S:rsync-rrsync-0:3.5.0-3.el10_2.1.noarch	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debuginfo-0:3.5.0-3.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debuginfo-0:3.5.0-3.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debuginfo-0:3.5.0-3.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debuginfo-0:3.5.0-3.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:99576	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2566038	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-119741	self
https://bugzilla.redhat.com/show_bug.cgi?id=2566038	external
https://www.cve.org/CVERecord?id=CVE-2026-119741	external
https://nvd.nist.gov/vuln/detail/CVE-2026-119741	external
https://github.com/RsyncProject/rsync	external
https://github.com/RsyncProject/rsync/blob/a7404a…	external
https://github.com/RsyncProject/rsync/commit/a740…	external
https://github.com/RsyncProject/rsync/pull/1132	external
https://www.vulncheck.com/advisories/rsync-throug…	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-119741",
      "cwe": {
        "id": "CWE-407",
        "name": "Inefficient Algorithmic Complexity"
      },
      "discovery_date": "2026-11-03T17:52:02.683590+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2566038"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in rsync. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending crafted checksum sequences during delta file transfers to a public rsync server. This flaw forces the server to perform excessive checksum computations across consecutive data offsets, leading to high CPU resource exhaustion that degrades or disrupts availability for legitimate users.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "rsync: rsync: Denial of Service via crafted checksums during delta transfer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat has rated this vulnerability as Important because an unauthenticated remote attacker accessing a public rsync daemon module can trigger excessive CPU consumption during delta transfers. Repeated or concurrent malicious transfers can exhaust processing capacity and disrupt service for legitimate users. Exposure depends on serving files to untrusted receivers; systems that do not provide such access are not exposed to this unauthenticated attack scenario.",
          "title": "Statement"
        },
        {
          "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"
        }
      ],
      "product_status": {
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          "BaseOS-10.2.Z.E2S:rsync-0:3.5.0-3.el10_2.1.src",
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          "BaseOS-10.2.Z.E2S:rsync-debuginfo-0:3.5.0-3.el10_2.1.x86_64",
          "BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.aarch64",
          "BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.ppc64le",
          "BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.s390x",
          "BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-119741"
        },
        {
          "category": "external",
          "summary": "RHBZ#2566038",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566038"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-119741",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-119741"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-119741",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119741"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync",
          "url": "https://github.com/RsyncProject/rsync"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/blob/a7404a9a633cff28ee1602f328b9c3fa69cdbd04/testsuite/hashsearch-collision-skip_test.py",
          "url": "https://github.com/RsyncProject/rsync/blob/a7404a9a633cff28ee1602f328b9c3fa69cdbd04/testsuite/hashsearch-collision-skip_test.py"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/commit/a7404a9a633cff28ee1602f328b9c3fa69cdbd04",
          "url": "https://github.com/RsyncProject/rsync/commit/a7404a9a633cff28ee1602f328b9c3fa69cdbd04"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/pull/1132",
          "url": "https://github.com/RsyncProject/rsync/pull/1132"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/rsync-through-3.5.1-denial-of-service-via-hash-search-checksum-collisions",
          "url": "https://www.vulncheck.com/advisories/rsync-through-3.5.1-denial-of-service-via-hash-search-checksum-collisions"
        }
      ],
      "release_date": "2026-11-03T15:26:27.533000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-12T10:54:10+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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            "BaseOS-10.2.Z.E2S:rsync-debugsource-0:3.5.0-3.el10_2.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:99576"
        },
        {
          "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.\n\n--- CME Mitigation Guidance (2026-11-06) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nThe highest-value action is to bound delta-transfer strong-checksum calculations and eliminate redundant collision lookups in rsync hash_search(): upgrade to the corresponding fixed Red Hat builds, which unlink duplicate false-alarm hash chain entries sharing identical strong checksums and advance offset by a full block after four consecutive unmatched weak checksum collisions, closing all 2 injection vectors (crafted weak-checksum collision sequences with mismatched strong checksums, duplicate colliding block hash chains). Until patched, this is a concern on rsync daemon deployments serving delta transfers to unauthenticated or untrusted receivers, so restrict network access to rsync daemon modules or disable unauthenticated delta file transfers from untrusted receivers. As a compensating measure, Apply RLIMIT_CPU limits to rsync worker processes using ulimit or prlimit to contain excessive CPU consumption during delta checksum searches and Throttle incoming connection rates and concurrent sessions per IP to mitigate repeated unauthenticated delta transfer DoS attempts. These controls limit blast radius and contain exploitation, but they do not fix the underlying algorithmic complexity defect \u2014 apply the upstream patch to fully remediate.\n\nHighest-impact CME: CME-114 Process Resource Limits (ulimit/prlimit) (medium)",
          "product_ids": [
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "rsync: rsync: Denial of Service via crafted checksums during delta transfer"
    }
  ]
}

CVE-2026-119741 (GCVE-0-2026-119741)

Vulnerability from cvelistv5 – Published: 2026-11-03 15:26 – Updated: 2026-11-04 14:15

Title

rsync < 3.5.2 Denial of Service via hash_search() Checksum Collisions

Summary

rsync before 3.5.2 contains a denial of service vulnerability in the delta-transfer sender's hash_search() in match.c that allows malicious receivers to trigger unbounded strong-checksum work at consecutive offsets. Unauthenticated attackers pulling from a public daemon module can supply weak checksums colliding with consecutive rolling windows plus non-matching strong checksums, exhausting sender CPU across concurrent connections.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-03 16:43 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7824 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/RsyncProject/rsync/releases/ta…	release-notes
https://github.com/RsyncProject/rsync/pull/1132	patchissue-tracking
https://github.com/RsyncProject/rsync/commit/a740…	patch
https://github.com/RsyncProject/rsync/blob/a7404a…	technical-description
https://www.vulncheck.com/advisories/rsync-throug…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
RsyncProject	rsync	Affected: 0 , ≤ 3.5.1 (semver) Unaffected: 3.5.2 (semver) cpe:2.3:a:samba:rsync::::::::

Date Public

2026-10-16 00:00

Credits

Samuel Henrique (samueloph) Dianne Skoll (dfskoll) Omar Elsayed (seks99x)

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-119741",
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                    "Technical Impact": "partial"
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                "timestamp": "2026-11-03T16:43:41.930734Z",
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                {
                  "criteria": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*",
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
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            "integrityImpact": "NONE",
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "tags": [
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    "datePublished": "2026-11-03T15:26:27.533Z",
    "dateReserved": "2026-10-30T15:31:52.079Z",
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}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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