CVE-2026-89092Network attack vector

nscd thread crash via unbounded DNS-response allocation

Published Sep 11, 2026 · Updated Sep 11, 2026

Stack overflow in nscd in GNU Project glibc 2.3.4 through 2.44 allows remote attackers to crash an nscd thread via a crafted DNS response. The DNS-response path sizes an alloca call from an oversized reply without bounding the allocation to the worker thread's available stack. Exploitation requires nscd to be enabled and use an untrusted DNS server capable of returning unusually large records; the resulting crash degrades name-resolution performance rather than stopping resolution.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in nscd in GNU Project glibc 2.3.4 through 2.44 allows remote attackers to crash an nscd thread via a crafted DNS response. The DNS-response path sizes an alloca call from an oversized reply without bounding the allocation to the worker thread's available stack. Exploitation requires nscd to be enabled and use an untrusted DNS server capable of returning unusually large records; the resulting crash degrades name-resolution performance rather than stopping resolution.

The record

CVE
CVE-2026-89092
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The GnuPG Project
Product
glibc
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=2.3.4 <2.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The GnuPG Project · glibcversion=2.3.4 <2.45

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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