CVE-2026-59939

httplib2: Decompression Bomb Denial of Service via Unbounded gzip/deflate Response Handling

httplib2 is a comprehensive HTTP client library for Python. Prior to 0.32.0, httplib2 performs unbounded decompression of HTTP response bodies encoded with Content-Encoding: gzip or deflate in _decompressContent in httplib2/init.py, allowing a malicious or compromised HTTP server to return a small compressed payload that expands to an arbitrarily large size in memory and causes MemoryError or OOM-kill in the client process. This issue is fixed in version 0.32.0.

Affected

httplib2

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.66% chance of exploitation in the next 30 days, 51st percentile

Published

2026-07-08

Updated

2026-08-20

Proof-of-concept exploits (1)

• advisories/GHSA-j5g9-f88f-gfj3

Security advisories

• httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3
• httplib2/httplib2/commit/87581ad6cf752fe3da2090c59058261d2d00a427

References

• CVE Record
• NVD entry