wordexp with WRDE_APPEND can return or use invalid memory
glibc · glibc
2.1LowCVSS 4.0
Recommended action
Scheduled
Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available
Distribution package intelligence
Ubuntu vendor package status
Canonical’s release and source-package findings are shown separately from local repository availability.
1 package state
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.
Ubuntu release
Source package
Vendor state
Fixed version
Evidence
Ubuntu 24.04 LTSnoble · standard archive
glibc
Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.
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-2026-6368 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityglibc: glibc: Process abort due to invalid memory in wordexp
676 known affected
The vendor explicitly identifies these products as affected by this CVE.
glibc as a component of Red Hat Enterprise Linux 10
glibc-all-langpacks as a component of Red Hat Enterprise Linux 10
glibc-benchtests as a component of Red Hat Enterprise Linux 10
glibc-common as a component of Red Hat Enterprise Linux 10
glibc-devel as a component of Red Hat Enterprise Linux 10
glibc-doc as a component of Red Hat Enterprise Linux 10
glibc-gconv-extra as a component of Red Hat Enterprise Linux 10
glibc-langpack-aa as a component of Red Hat Enterprise Linux 10
glibc-langpack-af as a component of Red Hat Enterprise Linux 10
glibc-langpack-agr as a component of Red Hat Enterprise Linux 10
glibc-langpack-ak as a component of Red Hat Enterprise Linux 10
glibc-langpack-am as a component of Red Hat Enterprise Linux 10
Summary
A flaw was found in glibc (GNU C Library). A local attacker or application using the wordexp function with the WRDE_APPEND flag can trigger the interface to return invalid memory in the we_wordv member. This invalid memory, when subsequently processed by wordfree, may cause the process to abort, leading to a Denial of Service (DoS).
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.
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-2026-55727
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 actionScheduled
Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Patch available
01
What, why and how
Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to return invalid memory in the we_wordv member, which on subsequent calls to wordfree may abort the process.
What
Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to return invalid memory in the we_wordv member, which on subsequent calls to wordfree may abort the process.
Why
The product uses or accesses a resource that has not been initialized.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
Calling wordexp with WRDE_APPEND in the GNU C Library version 2.0 to version 2.43 can cause the interface to return invalid memory in the we_wordv member, which on subsequent calls to wordfree may abort the process.
Why
The product uses or accesses a resource that has not been initialized.
How
An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
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 → Use of Uninitialized Resource → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Not a CVSS 4.0 base metric
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCLowVulnerable-system confidentiality: A successful attack can cause a limited loss.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.
UnauthenticatedCWE-908
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-55727Official EUVD mapping
0 linked advisory records.
Official EUVD record ↗BSI · German · WID-SEC-2026-2740GNU libc: Schwachstelle ermöglicht Denial of Service
Ein lokaler Angreifer kann eine Schwachstelle in GNU libc ausnutzen, um einen Denial of Service Angriff durchzuführen.
Official advisory ↗Cyber Security Agency of Singapore · English · CSA-SB-20260812Security Bulletin 12 Aug 2026
The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 12 Aug 2026, published on 12 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.
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.
Affected versionsThe structured affected or fixed version information changed.
Before
glibc as a component of Red Hat Enterprise Linux 10; glibc-all-langpacks as a component of Red Hat Enterprise Linux 10; glibc-benchtests as a component of Red Hat Enterprise Linux 10; glibc-common as a component of Red Hat Enterprise Linux 10; glibc-devel as a component of Red Hat Enterprise Linux 10; glibc-doc as a component of Red Hat Enterprise Linux 10; glibc-gconv-extra as a component of Red Hat Enterprise Linux 10; glibc-langpack-aa as a component of Red Hat Enterprise Linux 10; glibc-langpack-af as a component of Red Hat Enterprise Linux 10; glibc-langpack-agr as a component of Red Hat Enterprise Linux 10; glibc-langpack-ak as a component of Red Hat Enterprise Linux 10; glibc-langpack-am as a component of Red Hat Enterprise Linux 10; glibc-langpack-an as a component of Red Hat Enterprise Linux 10; glibc-langpack-anp as a component of Red Hat Enterprise Linux 10; glibc-langpack-ar as a component of Red Hat Enterprise Linux 10; glibc-langpack-as as a component of Red Hat Enterprise Linux 10; glibc-langpack-ast as a component of Red Hat Enterprise Linux 10; glibc-langpack-ayc as a component of Red Hat Enterprise Linux 10; glibc-langpack-az as a component of Red Hat Enterprise Linux 10; glibc-langpack-be as a component of Red Hat Enterprise Linux 10; glibc-langpack-bem as a component of Red Hat Enterprise Linux 10; glibc-langpack-ber as a component of Red Hat Enterprise Linux 10; glibc-langpack-bg as a component of Red Hat Enterprise Linux 10; glibc-langpack-bhb as a component of Red Hat Enterprise Linux 10; glibc-langpack-bho as a component of Red Hat Enterprise Linux 10; glibc-langpack-bi as a component of Red Hat Enterprise Linux 10; glibc-langpack-bn as a component of Red Hat Enterprise Linux 10; glibc-langpack-bo as a component of Red Hat Enterprise Linux 10; glibc-langpack-br as a component of Red Hat Enterprise Linux 10; glibc-langpack-brx as a component of Red Hat Enterprise Linux 10; and 645 more · Fixed: glibc-main@aarch64 as a component of Red Hat Hardened Images; glibc-main@noarch as a component of Red Hat Hardened Images; glibc-main@src as a component of Red Hat Hardened Images; glibc-main@x86_64 as a component of Red Hat Hardened Images
After
glibc as a component of Red Hat Enterprise Linux 10; glibc-all-langpacks as a component of Red Hat Enterprise Linux 10; glibc-benchtests as a component of Red Hat Enterprise Linux 10; glibc-common as a component of Red Hat Enterprise Linux 10; glibc-devel as a component of Red Hat Enterprise Linux 10; glibc-doc as a component of Red Hat Enterprise Linux 10; glibc-gconv-extra as a component of Red Hat Enterprise Linux 10; glibc-langpack-aa as a component of Red Hat Enterprise Linux 10; glibc-langpack-af as a component of Red Hat Enterprise Linux 10; glibc-langpack-agr as a component of Red Hat Enterprise Linux 10; glibc-langpack-ak as a component of Red Hat Enterprise Linux 10; glibc-langpack-am as a component of Red Hat Enterprise Linux 10; glibc-langpack-an as a component of Red Hat Enterprise Linux 10; glibc-langpack-anp as a component of Red Hat Enterprise Linux 10; glibc-langpack-ar as a component of Red Hat Enterprise Linux 10; glibc-langpack-as as a component of Red Hat Enterprise Linux 10; glibc-langpack-ast as a component of Red Hat Enterprise Linux 10; glibc-langpack-ayc as a component of Red Hat Enterprise Linux 10; glibc-langpack-az as a component of Red Hat Enterprise Linux 10; glibc-langpack-be as a component of Red Hat Enterprise Linux 10; glibc-langpack-bem as a component of Red Hat Enterprise Linux 10; glibc-langpack-ber as a component of Red Hat Enterprise Linux 10; glibc-langpack-bg as a component of Red Hat Enterprise Linux 10; glibc-langpack-bhb as a component of Red Hat Enterprise Linux 10; glibc-langpack-bho as a component of Red Hat Enterprise Linux 10; glibc-langpack-bi as a component of Red Hat Enterprise Linux 10; glibc-langpack-bn as a component of Red Hat Enterprise Linux 10; glibc-langpack-bo as a component of Red Hat Enterprise Linux 10; glibc-langpack-br as a component of Red Hat Enterprise Linux 10; glibc-langpack-brx as a component of Red Hat Enterprise Linux 10; and 646 more · Fixed: glibc-main@aarch64 as a component of Red Hat Hardened Images; glibc-main@noarch as a component of Red Hat Hardened Images; glibc-main@src as a component of Red Hat Hardened Images; glibc-main@x86_64 as a component of Red Hat Hardened Images
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.
CVE-2026-6368: wordexp with WRDE_APPEND can return or use invalid memory | BlackTree
