Vulnerability-Lookup

RHSA-2026:37468

Vulnerability from csaf_redhat - Published: 2026-07-10 00:17 - Updated: 2026-10-16 11:25

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: patch: * patch-2.8-4.2.hum1 (aarch64, x86_64) * patch-2.8-4.2.hum1.src (src) Security Fix(es): patch: * CVE-2026-56289

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-2026-56289

A flaw was found in GNU patch. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by supplying a specially crafted patch file. The improper validation of hunk (single block of changes in diff) line offsets in unified-diff input can lead to an effectively infinite processing loop, resulting in excessive CPU consumption and making the utility unresponsive, requiring manual termination.

5.5 (Medium)


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

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:patch-0:2.8-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:patch-0:2.8-4.2.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:patch-0:2.8-4.2.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:37468	self
https://access.redhat.com/security/cve/CVE-2026-56289	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-56289	self
https://bugzilla.redhat.com/show_bug.cgi?id=2498462	external
https://www.cve.org/CVERecord?id=CVE-2026-56289	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56289	external
https://cert.pl/en/posts/2026/07/CVE-2026-56288	external
https://cgit.git.savannah.gnu.org/cgit/patch.git/	external
https://cgit.git.savannah.gnu.org/cgit/patch.git/…	external

JSON

To clipboard

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        "id": "CWE-835",
        "name": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)"
      },
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          "text": "A flaw was found in GNU patch. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by supplying a specially crafted patch file. The improper validation of hunk (single block of changes in diff) line offsets in unified-diff input can lead to an effectively infinite processing loop, resulting in excessive CPU consumption and making the utility unresponsive, requiring manual termination.",
          "title": "Vulnerability description"
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          "text": "patch: GNU patch: Denial of Service via crafted unified-diff input",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "A moderate denial of service vulnerability was found in GNU patch, which ships in Red Hat Hardened Images. GNU patch does not properly validate hunk (single block of changes in diff) line offsets in unified-diff input: a specially crafted patch file that declares an extremely large line number causes the utility to enter an effectively infinite processing loop while attempting to locate the requested position, resulting in excessive CPU consumption and leaving the process unresponsive until it is manually terminated. Exploitation requires that a user or automated process apply the attacker-supplied malicious patch file; consequently Red Hat rates this flaw with a local attack vector and required user interaction (CVSS 5.5, CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H), whereas the upstream record characterizes the attacker as remote. Both assessments rate the overall severity as moderate. The Red Hat Hardened Images product is affected, and a fix is being pursued through the delegated resolution process.",
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            "integrityImpact": "NONE",
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            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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      "threats": [
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          "category": "impact",
          "details": "Moderate"
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      "title": "patch: GNU patch: Denial of Service via crafted unified-diff input"
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}

CVE-2026-56289 (GCVE-0-2026-56289)

Vulnerability from cvelistv5 – Published: 2026-07-09 09:29 – Updated: 2026-07-09 12:21 X_Open Source

Title

Loop with Unreachable Exit Condition in GNU patch

Summary

GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination. This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9

Severity

4.6 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 12:20 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

CERT-PL CNA under the ENISA root

CNA scorecard B 81/100 over 220 records in the last 180 days details

References

3 references

URL	Tags
https://cert.pl/en/posts/2026/07/CVE-2026-56288	third-party-advisory
https://cgit.git.savannah.gnu.org/cgit/patch.git/	product
https://cgit.git.savannah.gnu.org/cgit/patch.git/…	patch

Impacted products

1 product

Vendor	Product	Version
GNU	patch	Affected: 0 , ≤ 2.8.0 (semver)

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

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  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-56289",
    "datePublished": "2026-07-09T09:29:22.467Z",
    "dateReserved": "2026-06-20T10:58:09.261Z",
    "dateUpdated": "2026-07-09T12:21:39.125Z",
    "state": "PUBLISHED"
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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

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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