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Full vulnerability report · 2026
CVE-2026-56391High confidence

Out‑of‑bounds Read in GNU coreutils

GNU · coreutils

4.6MediumCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.17% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs GNU coreutils and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 4 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcecoreutilsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcecoreutilsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcecoreutilsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcecoreutilsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-56391 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycoreutils: GNU coreutils uniq: Denial of Service and information disclosure via out-of-bounds read with multibyte input
14 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • coreutils as a component of Red Hat Enterprise Linux 6
  • coreutils-libs as a component of Red Hat Enterprise Linux 6
  • coreutils.src as a component of Red Hat Enterprise Linux 6
  • coreutils.src as a component of Red Hat Enterprise Linux 7
  • coreutils as a component of Red Hat Enterprise Linux 8
  • coreutils-common as a component of Red Hat Enterprise Linux 8
  • coreutils-single as a component of Red Hat Enterprise Linux 8
  • coreutils.src as a component of Red Hat Enterprise Linux 8
  • coreutils as a component of Red Hat Enterprise Linux 9
  • coreutils-common as a component of Red Hat Enterprise Linux 9
  • coreutils-single as a component of Red Hat Enterprise Linux 9
  • coreutils.src as a component of Red Hat Enterprise Linux 9
Summary
A flaw was found in GNU coreutils uniq. When processing specially crafted multibyte input with the --check-chars option, an attacker can trigger an out-of-bounds read. This vulnerability can lead to a denial of service (DoS) due to an application crash and potentially expose sensitive information from adjacent memory.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-48524

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value. This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input. When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure. This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.

What

GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value. This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input. When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure. This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation when the stated preconditions are met. If successful, the issue may disrupt the affected service.

What

GNU coreutils uniq is vulnerable to an out‑of‑bounds read due to incorrect handling of multibyte input when the -w (--check-chars) option is used. The find_field() function miscalculates the byte length of characters by repeatedly processing a fixed pointer instead of advancing through the input, resulting in an inflated length value. This incorrect length is later used in a memcmp operation, causing reads beyond the allocated buffer when processing crafted multibyte input. When running GNU coreutils uniq with attacker-provided arguments, this behavior leads to a crash and potential adjacent heap memory exposure. This issue has been fixed in the commit d64e35a8a4c0e4608321433e0d84d917e4e36371.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation when the stated preconditions are met. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Out-of-bounds Read → disrupt the affected service
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Active interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIActiveUser interaction: A user must take a deliberate action for exploitation to succeed.VCLowVulnerable-system confidentiality: A successful attack can cause a limited loss.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedDenial of serviceCWE-125
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Cyber Security Agency of Singapore · English · CSA-SB-20260729Security Bulletin 29 Jul 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 29 Jul 2026, published on 29 July 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-030404GNU ProjectのCoreutilsにおける境界外読み取りに関する脆弱性

GNU coreutils の uniq は、-w (--check-chars) オプションを使用した際に、マルチバイト入力の不正な処理により境界外読み取りの脆弱性を引き起こします。find_field() 関数は、入力を進めるのではなく固定されたポインタを繰り返し処理することで文字のバイト長を誤って計算し、長さの値が過大になります。この誤った長さが後の memcmp 操作で使用されるため、細工されたマルチバイト入力を処理する際に割り当てられたバッファの範囲外を読み取ってしまいます。攻撃者が提供した引数で GNU coreutils uniq を実行すると、この挙動によってクラッシュや隣接するヒープメモリの情報漏洩が発生する可能性があります。この問題はコミット d64e35a8a4c0e4608321433e0d84d917e4e36371 で修正されています。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-030403GNU ProjectのCoreutilsにおけるヒープベースのバッファオーバーフローの脆弱性

GNU coreutils の unexpand には、大きなタブストップ（-t）値を処理する際にバッファ割り当て中で整数オーバーフローが発生し、その結果ヒープベースのバッファオーバーフローを引き起こす脆弱性があります。割り当てサイズを計算する際の乗算がオーバーフローし、十分なサイズでないバッファが確保されることがあります。細工された入力を処理すると、後続の書き込みが割り当てられたメモリ領域を超過し、境界外のヒープ書き込みが発生します。攻撃者が大きなタブストップ（-t）引数を指定して GNU coreutils unexpand を実行することで、この動作によりクラッシュが発生し、メモリの配置によってはヒープ書き込みプリミティブを獲得される可能性があります。この問題はコミット b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d により修正されました。

Official advisory ↗
CERT Polska · Polish · CVE-2026-56391CERT Polska w social mediach

CERT Polska otrzymał zgłoszenie o podatnościach w oprogramowaniu GNU coreutils i koordynował proces ujawniania informacji. Podatność CVE-2026-56391 : W narzędziu uniq z pakietu GNU coreutils zidentyfikowano podatność typu out-of-bounds read z powodu nieprawidłowej obsługi wielobajtowych danych wejściowych, gdy używana jest opcja -w ( --check-chars ). Funkcja find_field() błędnie oblicza długość w bajtach znaków, wielokrotnie przetwarzając stały wskaźnik zamiast przesuwać go wzdłuż danych wejściowych, co skutkuje zawyżoną wartością długości. Ta nieprawidłowa długość jest później używana w operacji memcmp , powodując odczyty poza przydzielonym buforem podczas przetwarzania spreparowanego wejścia wielobajtowego. Uruchomienie GNU coreutils uniq z argumentami dostarczonymi przez atakującego prowadzi do awarii programu i potencjalnego ujawnienia sąsiadującej pamięci sterty. Problem ten został rozwiązany w commicie d64e35a8a4c0e4608321433e0d84d917e4e36371. Podatność CVE-2026-56392 : Narzędzie unexpand z pakietu GNU coreutils jest podatne na heap-based buffer overflow z powodu przepełnienia liczby całkowitej podczas alokacji bufora przy przetwarzaniu dużych wartości tab stop ( -t ). Mnożenie używane do obliczania rozmiaru alokacji może spowodować przepełnienie zmiennej, co skutkuje buforem o zbyt małym rozmiarze. Podczas przetwarzania spreparowanych danych wejściowych kolejne operacje zapisu przekraczają przydzieloną pamięć. Uruchamianie GNU coreutils unexpand z dużymi argumentami tab stop ( -t ) dostarczonymi przez atakującego prowadzi do awarii programu i potencjalnie pozwala na osiągnięcie prymitywu zapisu na stercie w zależności od układu pamięci. Ten problem został naprawiony w commicie b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 24 Jul 2026 · Last source change 24 Jul 2026, 12:31 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-48524
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    9.5 ≤ 9.11 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    9.5 ≤ 9.11 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
    Red Hat Product Security ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Red Hat Product Security ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-56391 to remediation: access.redhat.com/CVE-2026-56391.
    Before
    remediation: access.redhat.com/CVE-2026-56391
    After
    remediation: access.redhat.com/CVE-2026-56391
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    coreutils as a component of Red Hat Enterprise Linux 10; coreutils-common as a component of Red Hat Enterprise Linux 10; coreutils-single as a component of Red Hat Enterprise Linux 10; coreutils.src as a component of Red Hat Enterprise Linux 10; coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    After
    coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-0:9.5-8.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-0:9.5-8.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-0:9.5-8.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-0:9.5-8.el10_2.1.src as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-0:9.5-8.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debuginfo-0:9.5-8.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debuginfo-0:9.5-8.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debuginfo-0:9.5-8.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debuginfo-0:9.5-8.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debugsource-0:9.5-8.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debugsource-0:9.5-8.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debugsource-0:9.5-8.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-debugsource-0:9.5-8.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-0:9.5-8.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-0:9.5-8.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-0:9.5-8.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-0:9.5-8.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-debuginfo-0:9.5-8.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-debuginfo-0:9.5-8.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-debuginfo-0:9.5-8.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-single-debuginfo-0:9.5-8.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    coreutils as a component of Red Hat Enterprise Linux 10; coreutils-common as a component of Red Hat Enterprise Linux 10; coreutils-single as a component of Red Hat Enterprise Linux 10; coreutils.src as a component of Red Hat Enterprise Linux 10; coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    After
    coreutils as a component of Red Hat Enterprise Linux 10; coreutils-common as a component of Red Hat Enterprise Linux 10; coreutils-single as a component of Red Hat Enterprise Linux 10; coreutils.src as a component of Red Hat Enterprise Linux 10; coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    coreutils as a component of Red Hat Enterprise Linux 10; coreutils-common as a component of Red Hat Enterprise Linux 10; coreutils-single as a component of Red Hat Enterprise Linux 10; coreutils.src as a component of Red Hat Enterprise Linux 10; coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; rhcos as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    After
    coreutils as a component of Red Hat Enterprise Linux 10; coreutils-common as a component of Red Hat Enterprise Linux 10; coreutils-single as a component of Red Hat Enterprise Linux 10; coreutils.src as a component of Red Hat Enterprise Linux 10; coreutils as a component of Red Hat Enterprise Linux 6; coreutils-libs as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 6; coreutils.src as a component of Red Hat Enterprise Linux 7; coreutils as a component of Red Hat Enterprise Linux 8; coreutils-common as a component of Red Hat Enterprise Linux 8; coreutils-single as a component of Red Hat Enterprise Linux 8; coreutils.src as a component of Red Hat Enterprise Linux 8; coreutils as a component of Red Hat Enterprise Linux 9; coreutils-common as a component of Red Hat Enterprise Linux 9; coreutils-single as a component of Red Hat Enterprise Linux 9; coreutils.src as a component of Red Hat Enterprise Linux 9; openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · Fixed: coreutils-main@aarch64 as a component of Red Hat Hardened Images; coreutils-main@src as a component of Red Hat Hardened Images; coreutils-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-48524↗Red Hat Product Security security advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-56391 · cve.blacktree.nl