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Advisory record · GHSA-6cp7-3m3c-5x5c

Zapros: Streaming decoders ignored the requested chunk size, allowing a single compressed response chunk to allocate unbounded memory (decompression bomb)

CVSS 8.7 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 13:57 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
zaprosPyPI<0.14.00.14.0
Identifiers
GHSA-6cp7-3m3c-5x5c · CVE-2026-61652 · PYSEC-2026-4182
Weakness (CWE)
CWE-770
Tags
Published
23 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Zapros versions before 0.14.0 have a denial-of-service flaw: their streaming decoders ignored the requested chunk size, so a single compressed response chunk could expand far beyond that bound and exhaust memory. An attacker who can make a server send a compressed response to the client can trigger this. Upgrade to zapros 0.14.0 or later, which limits decompression output to the requested chunk size. If you cannot upgrade, read raw bodies with iter_raw or async_iter_raw and decompress them with your own output limit, or avoid decoding responses from untrusted servers.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.