CVE-2026-19508Network attack vector

Memory corruption via multipart parser overflow

Published Aug 19, 2026 · Updated Aug 19, 2026

Heap overflow in RDK RDK-B WebUI rdkb-2025q4-kirkstone.04.10.26 allows remote attackers to corrupt memory via crafted multipart/form-data. Public sources identify jst_post.c's multipart form-data parser as the affected locus but do not disclose which length check or copy operation overruns the heap buffer. Exposure requires network reachability to the device-local WebUI; confirmed impact is memory corruption and crash-level service interruption, while arbitrary code execution remains unproven in public records.

CVSS severityUnavailable
Unscored
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in RDK RDK-B WebUI rdkb-2025q4-kirkstone.04.10.26 allows remote attackers to corrupt memory via crafted multipart/form-data. Public sources identify jst_post.c's multipart form-data parser as the affected locus but do not disclose which length check or copy operation overruns the heap buffer. Exposure requires network reachability to the device-local WebUI; confirmed impact is memory corruption and crash-level service interruption, while arbitrary code execution remains unproven in public records.

The record

CVE
CVE-2026-19508
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
RDK Management LLC
Product
RDK-B WebUI
Classifications
CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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?

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  1. Affected versionversion=rdkb-2025q4-kirkstone

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RDK Management LLC · RDK-B WebUIversion=rdkb-2025q4-kirkstone

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

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

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

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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