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CVE-2026-61541— Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service

Quick assessment

Affected
kap-sh zapros
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service when an application requests content from an untrusted server, or follows a redirect to one, because a malicious response containing an excessive number of chained values

CVSS 6.9 · Medium EPSS 0.25% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
kap-sh zapros < 0.14.0 affected
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I. Basic Information for CVE-2026-61541

Vulnerability Information

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Vulnerability Title
Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
Zapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service when an application requests content from an untrusted server, or follows a redirect to one, because a malicious response containing an excessive number of chained `Content-Encoding` values causes Zapros to construct a deeply nested decompression chain that consumes excessive resources. Version 0.14.0 patches the vulnerability by limiting responses to five content-encoding layers and raising `DecodingError` when that limit is exceeded. As a workaround, applications can add response middleware that inspects the `Content-Encoding` header and rejects responses containing more than a safe number of encoding layers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kap-sh zapros < 0.14.0 -

II. Public POCs for CVE-2026-61541

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III. Intelligence Information for CVE-2026-61541

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Other References for CVE-2026-61541 (1)

IV. Related Vulnerabilities

Same product: zapros
Same vendor: kap-sh
Same weakness: CWE-770

V. Comments for CVE-2026-61541

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