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Full vulnerability report · 2026
CVE-2026-40553High confidence

Stack-based buffer overflow in gawk

GNU · gawk

5.1MediumCVSS 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 0.29% 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 gawk 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 · sourcegawkAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcegawkAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcegawkAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcegawkAffected, 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-2026-40553 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitygawk: Gawk: Buffer overflow in ftype() routine may lead to code execution or denial of service
1 known affected

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

  • gawk.src as a component of Red Hat Enterprise Linux 6
Summary
A flaw was found in gawk. A buffer overflow vulnerability exists in the `ftype()` routine, located in the `extension/readdir.c` program file. This vulnerability could allow an attacker to crash the program, resulting in a denial of service. It may also potentially lead to arbitrary code execution, though this has not been definitively confirmed.
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-2026-43495

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

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.

What

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. 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 → Stack-based Buffer Overflow → disrupt the affected service
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
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-121 ↗

CWE-121: Stack-based Buffer Overflow. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

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:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L

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.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VILowVulnerable-system integrity: A successful attack can cause a limited loss.VALowVulnerable-system availability: A successful attack can cause a limited loss.SCLowSubsequent-system confidentiality: A successful attack can cause a limited loss.SILowSubsequent-system integrity: A successful attack can cause a limited loss.SALowSubsequent-system availability: A successful attack can cause a limited loss.
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-121
A

Official authority intelligence

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

BSI · German · WID-SEC-2026-3649Red Hat Enterprise Linux (gawk): Mehrere Schwachstellen

Ein lokaler Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen, Speicherbeschädigungen zu verursachen und möglicherweise beliebigen Code auszuführen.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-023674catdocのGawkにおけるスタックベースのバッファオーバーフローの脆弱性

gawkの「extension/readdir.c」プログラムファイル内のftype()ルーチンにバッファオーバーフローの脆弱性が発見されました。この問題はプログラムをクラッシュさせるために悪用される可能性があり、理論上はコード実行を達成する手段となり得ますが、後者が実際に可能かどうかは確認されていません。本脆弱性はバージョン5.4.0以下のgawkに影響を与えます。

Official advisory ↗
CERT Polska · Polish · CVE-2026-40467CERT Polska w social mediach

CERT Polska otrzymał zgłoszenie o podatnościach w oprogramowaniu GNU gawk i koordynował proces ujawniania informacji. Podatność CVE-2026-40467 : W pliku źródłowym io.c programu gawk (procedura do_getline_redir() ) wykryto podatność typu Use After Free. Może ona prowadzić do awarii programu. Podatność CVE-2026-40468 : W pliku źródłowym builtin.c programu gawk wykryto podatność typu integer overflow. Może ona prowadzić do wyczerpania pamięci systemu operacyjnego oraz zostać wykorzystana do nadpisania metadanych sterty i obiektów bajtami kontrolowanymi przez atakującego. Podatność CVE-2026-40469 : W pliku źródłowym builtin.c programu gawk (procedura do_sub() ) wykryto podatność typu integer overflow. Może ona zostać wykorzystana do nadpisania metadanych sterty i obiektów, powodując awarię programu. Podatność dotyczy 32-bitowych kompilacji programu gawk. Podatność CVE-2026-40553 : W pliku źródłowym extension/readdir.c programu gawk (procedura ftype() ) wykryto podatność typu buffer overflow. Może ona zostać wykorzystana do spowodowania awarii programu, a potencjalnie również do wykonania kodu, choć możliwość ta nie została potwierdzona. Podatności zostały wyeliminowane w wydaniu 5.4.1 programu gawk.

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
gawk.src as a component of Red Hat Enterprise Linux 6
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 13 Jul 2026 · Last source change 13 Jul 2026, 13:00 UTC · CWE-121 · Stack-based Buffer Overflow

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-2026-43495
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

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
    gawk.src as a component of Red Hat Enterprise Linux 6; gawk-all-langpacks as a component of Red Hat Enterprise Linux 9; gawk.src as a component of Red Hat Enterprise Linux 9 · Fixed: gawk-all-langpacks-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.src as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.4.0-3.1.hum1@aarch64 as a component of Red Hat Hardened Images; gawk-0:5.4.0-3.1.hum1@src as a component of Red Hat Hardened Images; gawk-0:5.4.0-3.1.hum1@x86_64 as a component of Red Hat Hardened Images; gawk-0:5.4.1-1.hum1@aarch64 as a component of Red Hat Hardened Images; gawk-0:5.4.1-1.hum1@src as a component of Red Hat Hardened Images; and 3 more
    After
    gawk.src as a component of Red Hat Enterprise Linux 6 · Fixed: gawk-all-langpacks-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.1.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-all-langpacks-0:5.1.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-all-langpacks-0:5.1.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-all-langpacks-0:5.1.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debuginfo-0:5.1.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debuginfo-0:5.1.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debuginfo-0:5.1.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debuginfo-0:5.1.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debugsource-0:5.1.0-6.el9_8.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debugsource-0:5.1.0-6.el9_8.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debugsource-0:5.1.0-6.el9_8.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-debugsource-0:5.1.0-6.el9_8.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9); gawk-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.src as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); and 28 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ 5.4.0 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
    After
    ≤ 5.4.0 · 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 ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-40553 to remediation: access.redhat.com/CVE-2026-40553.
    Before
    remediation: access.redhat.com/CVE-2026-40553
    After
    remediation: access.redhat.com/CVE-2026-40553
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    gawk-all-langpacks as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 6; gawk-all-langpacks as a component of Red Hat Enterprise Linux 9; gawk.src as a component of Red Hat Enterprise Linux 9 · Fixed: gawk-main@aarch64 as a component of Red Hat Hardened Images; gawk-main@noarch as a component of Red Hat Hardened Images; gawk-main@src as a component of Red Hat Hardened Images; gawk-main@x86_64 as a component of Red Hat Hardened Images
    After
    gawk.src as a component of Red Hat Enterprise Linux 6; gawk-all-langpacks as a component of Red Hat Enterprise Linux 9; gawk.src as a component of Red Hat Enterprise Linux 9 · Fixed: gawk-all-langpacks-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-all-langpacks-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); gawk-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.src as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debuginfo-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-debugsource-0:5.3.0-6.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10); gawk-0:5.4.0-3.1.hum1@aarch64 as a component of Red Hat Hardened Images; gawk-0:5.4.0-3.1.hum1@src as a component of Red Hat Hardened Images; gawk-0:5.4.0-3.1.hum1@x86_64 as a component of Red Hat Hardened Images; gawk-0:5.4.1-1.hum1@aarch64 as a component of Red Hat Hardened Images; gawk-0:5.4.1-1.hum1@src as a component of Red Hat Hardened Images; and 3 more
    Red Hat Product Security ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    ≤ 5.4.0 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    ≤ 5.4.0 · Fixed: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
    Red Hat Product Security ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    gawk-all-langpacks as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 6; gawk.src as a component of Red Hat Enterprise Linux 7; gawk.src as a component of Red Hat Enterprise Linux 8; gawk-all-langpacks as a component of Red Hat Enterprise Linux 9; gawk.src as a component of Red Hat Enterprise Linux 9 · Fixed: gawk-main@aarch64 as a component of Red Hat Hardened Images; gawk-main@noarch as a component of Red Hat Hardened Images; gawk-main@src as a component of Red Hat Hardened Images; gawk-main@x86_64 as a component of Red Hat Hardened Images
    After
    gawk-all-langpacks as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 10; gawk.src as a component of Red Hat Enterprise Linux 6; gawk-all-langpacks as a component of Red Hat Enterprise Linux 9; gawk.src as a component of Red Hat Enterprise Linux 9 · Fixed: gawk-main@aarch64 as a component of Red Hat Hardened Images; gawk-main@noarch as a component of Red Hat Hardened Images; gawk-main@src as a component of Red Hat Hardened Images; gawk-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 or patch reference recorded
Fixed release recorded from official guidance
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-43495↗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-2026-40553 · cve.blacktree.nl