CVE-2026-61541

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.9 / 10
CVSS vector: 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
Effective score: 6.9 / 10 MEDIUM source: CNA overview
CWE(s): CWE-770
Reserved: 2026-07-10
Published: 2026-09-21 21:21 UTC
Last updated: 2026-09-21 21:21 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/61xxx/CVE-2026-61541.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-21 22:16:57 UTC
NVD last modified: 2026-09-21 22:16:57 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84182
Assigner: GitHub_M
Published: Sep 21, 2026, 9:21:21 PM
Updated: Sep 21, 2026, 9:21:21 PM
EUVD base score (CVSS 4.0): 6.9 / 10
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
EUVD-reported EPSS: 0.0000
Vendors: kap-sh
Products: zapros (< 0.14.0)

ENISA 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.

EUVD references (1)

https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622

Affected products (1)

Vendor	Product	Versions	Platforms
kap-sh	zapros	`< 0.14.0` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622 x_refsource_CONFIRM

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622 security-advisories@github.com

Remediations (10)

CVE-2026-61541 | Vulnerability Database | Aqua Security

web:avd.aquasec.com

CVE-2026-61541 Vulnerability, Severity 0 N/A, Allocation of Resources Without Limits or Throttling

2026-09-22 17:11 UTC
CVE-2026-61541: Kap Sh Zapros Denial of Service - CVETodo

web:cvetodo.com

CVE-2026-61541 is a CVSS 6.9 Denial of Service vulnerability in Kap Sh Zapros. Full technical analysis, mitigations , and exploit status — updated in real time.

2026-09-22 17:11 UTC
CVE-2026-61541 - Exploits & Severity - Feedly

web:feedly.com

In kap-sh Zapros (Python HTTP client) versions prior to 0.14.0, a denial-of-service can occur when requesting content from an untrusted server or following a redirect to one, because a malicious response with an excessive number of chained `Content-Encoding` values makes Zapros build a deeply nested decompression chain that consumes excessive resources.

2026-09-22 17:11 UTC
OWASP Juice Shop | OWASP Foundation

web:owasp.org

OWASP Juice Shop is probably the most modern and sophisticated insecure web application! It can be used in security trainings, awareness demos, CTFs and as a guinea pig for security tools! Juice Shop encompasses vulnerabilities from the entire OWASP Top Ten along with many other security flaws found in real-world applications! Description Juice Shop is written in Node.js, Express and Angular ...

2026-09-22 17:11 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-22 17:11 UTC
sk185152 - CVE-2026-62144 - Management Authentication Bypass and ...

web:support.checkpoint.com

This issue received the ID CVE - 2026 -62144. Mitigation Follow the Check Point Hardening Best Practices Guide. Limit Trusted Clients (GUI clients) to trusted IP addresses/subnets. To do so, In SmartConsole, go to Manage & Settings > Permissions & Administrators > Trusted Clients. Double-click the client you want to edit.

2026-09-22 17:11 UTC
Description of the security update for Office 2016: August 11, 2026 ...

web:support.microsoft.com

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?) How to get and install the update Method 1: Microsoft Update This update is available from Microsoft Update. When you turn on ...

2026-09-22 17:11 UTC
SAP Security Patch Day - April 2026

web:support.sap.com

SAP security patch day bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 14 th of April 2026 , SAP security patch day saw the release of 19 new security notes. There is 1 update to previously ...

2026-09-22 17:11 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-22 17:11 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-22 17:11 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-61541.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "zapros",
          "vendor": "kap-sh",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.14.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T21:21:21.321Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kap-sh/zapros/security/advisories/GHSA-5vjj-2r48-q622"
        }
      ],
      "source": {
        "advisory": "GHSA-5vjj-2r48-q622",
        "discovery": "UNKNOWN"
      },
      "title": "Zapros has an Unbounded Content-Encoding decompression chain that allows denial of service"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61541",
    "datePublished": "2026-09-21T21:21:21.321Z",
    "dateReserved": "2026-07-10T16:27:03.093Z",
    "dateUpdated": "2026-09-21T21:21:21.321Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}