Vulnerability-Lookup

RHSA-2026:78952

Vulnerability from csaf_redhat - Published: 2026-10-08 09:09 - Updated: 2026-10-08 12:01

Summary

Red Hat Security Advisory: tftp security update

Severity

Moderate

Notes

Topic: An update for tftp 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 Trivial File Transfer Protocol (TFTP) is typically used only for booting diskless workstations. The tftp packages include the tftp and tftp-server subpackages. The tftp subpackage provides the user interface for TFTP and the tftp-server subpackage provides the server. This allows users to transfer files to and from a remote machine. Security Fix(es): * tftp: tftp-hpa: Denial of Service due to out-of-bounds read/write in remap engine (CVE-2026-85234) 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-2026-85234

A flaw was found in tftp-hpa. When the `in.tftpd` remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.

7.5 (High)


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

CWE-125 - Out-of-bounds Read

Affected products

Fixed 21 products

Product	Version	Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-0:5.2-28.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-0:5.2-28.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-0:5.2-28.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-0:5.2-28.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-0:5.2-28.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debuginfo-0:5.2-28.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debuginfo-0:5.2-28.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debuginfo-0:5.2-28.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debuginfo-0:5.2-28.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debugsource-0:5.2-28.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debugsource-0:5.2-28.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debugsource-0:5.2-28.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-debugsource-0:5.2-28.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:78952	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2460997	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-85234	self
https://bugzilla.redhat.com/show_bug.cgi?id=2460997	external
https://www.cve.org/CVERecord?id=CVE-2026-85234	external
https://nvd.nist.gov/vuln/detail/CVE-2026-85234	external
https://git.kernel.org/pub/scm/network/tftp/tftp-…	external

Acknowledgments

JSON

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            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-0:5.2-28.el8_10.x86_64",
            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:tftp-server-debuginfo-0:5.2-28.el8_10.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tftp: tftp-hpa: Denial of Service due to out-of-bounds read/write in remap engine"
    }
  ]
}

CVE-2026-85234 (GCVE-0-2026-85234)

Vulnerability from cvelistv5 – Published: 2026-09-15 17:58 – Updated: 2026-10-08 09:13

Title

Tftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine

Summary

Severity

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 2026-09-15 19:07 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 968 records in the last 180 days details

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:78952	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-85234	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460997	issue-trackingx_refsource_REDHAT
https://git.kernel.org/pub/scm/network/tftp/tftp-…

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:5.2-28.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1

Date Public

2026-09-15 15:36

Credits

This issue was discovered by Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
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                "id": "CVE-2026-85234",
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T19:07:11.649679Z",
                "version": "2.0.3"
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          "product": "Red Hat Enterprise Linux 9",
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          "cpes": [
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          "defaultStatus": "unaffected",
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        }
      ],
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

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RHSA-2026:78952

CVE-2026-85234 (GCVE-0-2026-85234)

Tags

Sightings

Nomenclature

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