CVE-2026-61652

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=...)) 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.

Affected Software

Weaknesses

• CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling

References

• https://github.com/kap-sh/zapros/security/advisories/GHSA-6cp7-3m3c-5x5c

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