kap-sh Zapros up to 0.13.x Decoder Response.iter_bytes chunk_size memory allocation

Summaryinfo

A vulnerability, which was classified as problematic, was found in kap-sh Zapros up to 0.13.x. Affected by this vulnerability is the function Response.iter_bytes of the component Decoder. Executing a manipulation of the argument chunk_size can lead to memory allocation. This vulnerability appears as CVE-2026-61652. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in kap-sh Zapros up to 0.13.x and classified as problematic. This vulnerability affects the function Response.iter_bytes of the component Decoder. The manipulation of the argument chunk_size with an unknown input leads to a memory allocation vulnerability. The CWE definition for the vulnerability is CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-61652 since 07/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 0.14.0 eliminates this vulnerability.

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Productinfo

Vendor

• kap-sh

Name

• Zapros

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13

Website

• Product: https://github.com/kap-sh/zapros/

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