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CVE-2026-61652
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=...)) 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.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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