{"id":"CVE-2026-61652","title":"Zapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service via memory exhaustion","summary":"Zapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service via memory exhaustion. The issue affects all callers who streamed compressed responses relying on the chunk size — explicit (`iter_bytes(chunk_size=…","severity":"high","cvss":8.7,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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":"2026-09-24","sourceUpdated":"2026-09-24T21:25:27.050","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61652","references":[{"url":"https://github.com/kap-sh/zapros/security/advisories/GHSA-6cp7-3m3c-5x5c","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61652"},{"url":"https://github.com/kap-sh/zapros/commit/9b59fa65857734599c34b0b3dff4c2b62293a68d"},{"url":"https://github.com/kap-sh/zapros/releases/tag/v0.14.0"},{"url":"https://github.com/advisories/GHSA-6cp7-3m3c-5x5c"},{"url":"https://github.com/kap-sh/zapros"},{"url":"https://pypi.org/project/zapros"}],"tags":["nvd","cve.org","ghsa","pip","osv"],"epss":0.00436,"epssPercentile":0.37681,"aliases":["GHSA-6cp7-3m3c-5x5c","PYSEC-2026-4182"],"ecosystem":"pip","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-22T14:39:06.743797Z"},"cvssSource":"cna","ingestedAt":"2026-09-21T21:53:57.433Z","slug":"CVE-2026-61652","body":"## Overview\n\nZapros, a Python HTTP client, prior to version 0.14.0 is vulnerable to denial of service via memory exhaustion. The issue affects all callers who streamed compressed responses relying on the chunk size — explicit (`iter_bytes(chunk_size=...)`) or the default — to bound memory. The decoder ignored that bound, so a chunk could be far larger than requested and a single compressed response could overflow memory. Version 0.14.0 contains a patch. Some workarounds are available. Read the still-compressed body with `Response.iter_raw()` / `Response.async_iter_raw()`, which bypass the built-in decoders, and decompress it yourself with an explicit output-size bound (e.g. `zlib`'s `max_length`), aborting once a configured limit is exceeded. Where feasible, send `Accept-Encoding: identity` to disable response compression so bodies are not decompressed client-side. Avoid decoding response bodies from untrusted servers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-61652)\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-6cp7-3m3c-5x5c","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}