CVE-2026-34502Network attack vector

Application crash via crafted memcached response

Published Aug 6, 2026 · Updated Aug 6, 2026

Heap-based buffer overflow in the APR-util memcached client 1.3.0 through 1.6.3 allows attackers to crash consuming applications. Apache has not disclosed which memcached response field or buffer operation permits the heap overwrite. Exploitation requires control of the queried memcached server or a man-in-the-middle position, and the bounded result is an application crash or hang.

CVSS severity7.5
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the APR-util memcached client 1.3.0 through 1.6.3 allows attackers to crash consuming applications. Apache has not disclosed which memcached response field or buffer operation permits the heap overwrite. Exploitation requires control of the queried memcached server or a man-in-the-middle position, and the bounded result is an application crash or hang.

The record

CVE
CVE-2026-34502
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Apache Software Foundation
Product
Apache Portable Runtime Utility
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.0 <=1.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Portable Runtime Utilityversion=1.3.0 <=1.6.3

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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