{"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":"2026-09-30","sourceUpdated":"2026-09-30T17:32:07.107","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"},{"url":"https://pypi.org/project/zapros"}],"tags":["nvd","cve.org","ghsa","pip","osv"],"epss":0.00428,"epssPercentile":0.36851,"aliases":["GHSA-5vjj-2r48-q622","PYSEC-2026-4181"],"ecosystem":"pip","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T19:07:48.022494Z"},"cvssSource":"cna","ingestedAt":"2026-09-21T21:53:57.432Z","slug":"CVE-2026-61541","body":"## Overview\n\nZapros, 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-61541)\n\nAffected packages:\n\n- `zapros < 0.14.0`\n\nPatched in:\n\n- `zapros 0.14.0`\n\nSource: https://github.com/advisories/GHSA-5vjj-2r48-q622","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}