BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-34501High confidence

Apache Portable Runtime Utility: Heap buffer overflow in APR redis client

Apache Software Foundation · Apache Portable Runtime Utility

7.5HighCVSS 3.1

Recommended action

Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

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	`apr-util`	Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.	`1.6.3-1.1ubuntu7.1`	Canonical record ↗Source updated 8 Sept 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-2026-34501 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityapr-util: Apache Portable Runtime Utility: Heap buffer overflow in redis client

47 known affected

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

apr-util-devel as a component of Red Hat Enterprise Linux 10
apr-util-ldap as a component of Red Hat Enterprise Linux 10
apr-util-lmdb as a component of Red Hat Enterprise Linux 10
apr-util-mysql as a component of Red Hat Enterprise Linux 10
apr-util-odbc as a component of Red Hat Enterprise Linux 10
apr-util-openssl as a component of Red Hat Enterprise Linux 10
apr-util-pgsql as a component of Red Hat Enterprise Linux 10
apr-util-sqlite as a component of Red Hat Enterprise Linux 10
apr-util.src as a component of Red Hat Enterprise Linux 10
apr-util as a component of Red Hat Enterprise Linux 6
apr-util-devel as a component of Red Hat Enterprise Linux 6
apr-util-ldap as a component of Red Hat Enterprise Linux 6

Summary: A flaw was found in the Redis client in the Apache Portable Runtime Utility (apr-util). A heap buffer overflow can be triggered when the application processes a specially crafted response from a Redis server, resulting in a crash and denial of service.
Remediation: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/

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-2026-53917

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 actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This issue affects Apache Portable Runtime Utility: from 1.6.0 through 1.6.3. Users are recommended to upgrade to version 1.6.4, which fixes the issue.

What

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path 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

Why

How

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: a network path → Heap-based Buffer Overflow → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface: Network
Privileges required: None: unauthenticated exploitation is possible
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-122 ↗
CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkUnauthenticatedCWE-122

Official authority intelligence

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

ENISA EUVD · EUVD-2026-53917Official EUVD mapping

0 linked advisory records.

Official EUVD record

BSI · German · WID-SEC-W-2026-2697Apache Portable Runtime (APR): Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Apache Portable Runtime (APR) ausnutzen, um SQL-Injection durchzuführen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

Official advisory

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.: Patch available
Affected: apr-util-devel as a component of Red Hat Enterprise Linux 10; apr-util-ldap as a component of Red Hat Enterprise Linux 10; apr-util-lmdb as a component of Red Hat Enterprise Linux 10; apr-util-mysql as a component of Red Hat Enterprise Linux 10; apr-util-odbc as a component of Red Hat Enterprise Linux 10; apr-util-openssl as a component of Red Hat Enterprise Linux 10; apr-util-pgsql as a component of Red Hat Enterprise Linux 10; apr-util-sqlite as a component of Red Hat Enterprise Linux 10; apr-util.src as a component of Red Hat Enterprise Linux 10; apr-util as a component of Red Hat Enterprise Linux 6; apr-util-devel as a component of Red Hat Enterprise Linux 6; apr-util-ldap as a component of Red Hat Enterprise Linux 6; apr-util-mysql as a component of Red Hat Enterprise Linux 6; apr-util-odbc as a component of Red Hat Enterprise Linux 6; apr-util-pgsql as a component of Red Hat Enterprise Linux 6; apr-util-sqlite as a component of Red Hat Enterprise Linux 6; apr-util.src as a component of Red Hat Enterprise Linux 6; apr-util as a component of Red Hat Enterprise Linux 7; apr-util-devel as a component of Red Hat Enterprise Linux 7; apr-util-ldap as a component of Red Hat Enterprise Linux 7; apr-util-mysql as a component of Red Hat Enterprise Linux 7; apr-util-nss as a component of Red Hat Enterprise Linux 7; apr-util-odbc as a component of Red Hat Enterprise Linux 7; apr-util-openssl as a component of Red Hat Enterprise Linux 7; apr-util-pgsql as a component of Red Hat Enterprise Linux 7; apr-util-sqlite as a component of Red Hat Enterprise Linux 7; apr-util.src as a component of Red Hat Enterprise Linux 7; apr-util as a component of Red Hat Enterprise Linux 8; apr-util-bdb as a component of Red Hat Enterprise Linux 8; apr-util-devel as a component of Red Hat Enterprise Linux 8; and 17 more
Fixed: apr-util-main@aarch64 as a component of Red Hat Hardened Images; apr-util-main@src as a component of Red Hat Hardened Images; apr-util-main@x86_64 as a component of Red Hat Hardened Images
Action: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 6 Aug 2026 · Last source change 6 Aug 2026, 21:56 UTC · CWE-122 · Heap-based Buffer Overflow

CVE recordCVE.org · 5.2

CVSS sourceCISA ADP

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-2026-53917

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 →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

2026-08-06CVE published

ENISA EUVD · EUVD-2026-53917↗Vendor CSAF · Red Hat Product Security↗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.