CVE-2026-61652Public exploitNetwork attack vectorHinoki check available

Client denial of service via unbounded decompression

Published Sep 21, 2026 · Updated Sep 21, 2026

Denial of service in Zapros before 0.14.0 allows remote attackers to exhaust client memory via a compressed HTTP response. Zapros streaming decoders returned the full decompressed output for each input chunk instead of enforcing the requested chunk_size bound. The client must stream an attacker-controlled compressed response through a built-in decoder; memory exhaustion can crash or hang the consuming process.

CVSS severity8.7
High
EPSS probability0.44%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Zapros before 0.14.0 allows remote attackers to exhaust client memory via a compressed HTTP response. Zapros streaming decoders returned the full decompressed output for each input chunk instead of enforcing the requested chunk_size bound. The client must stream an attacker-controlled compressed response through a built-in decoder; memory exhaustion can crash or hang the consuming process.

The record

CVE
CVE-2026-61652
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
kap-sh
Product
Zapros
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 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=< 0.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

kap-sh · Zaprosversion=< 0.14.0

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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