---
id: CVE-2026-61541
title: >-
  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 nu…
summary: >-
  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 nu…
severity: medium
cvss: 6.9
cvssVector: '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'
cwe:
  - CWE-770
vendor: kap-sh
product: zapros
affected:
  - zapros < 0.14.0
patched:
  - zapros 0.14.0
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T20:17:12.020'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61541'
references:
  - url: 'https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61541'
  - url: >-
      https://github.com/kap-sh/zapros/commit/7971fbca9707eb01455ca2d73416ac091f96908b
  - url: 'https://github.com/kap-sh/zapros/releases/tag/v0.14.0'
  - url: 'https://github.com/advisories/GHSA-5vjj-2r48-q622'
  - url: 'https://github.com/kap-sh/zapros'
tags:
  - nvd
  - cve.org
  - ghsa
  - pip
  - osv
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-23T19:07:48.022494Z'
cvssSource: cna
epss: 0.00253
epssPercentile: 0.17061
aliases:
  - GHSA-5vjj-2r48-q622
ecosystem: pip
ingestedAt: '2026-09-21T21:53:57.432Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-61541)

Affected packages:

- `zapros < 0.14.0`

Patched in:

- `zapros 0.14.0`

Source: https://github.com/advisories/GHSA-5vjj-2r48-q622