CVE-2026-59939
httplib2: Decompression Bomb Denial of Service via Unbounded gzip/deflate Response Handling
Description
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.
INFO
Published Date :
July 8, 2026, 8:16 p.m.
Last Modified :
Aug. 20, 2026, 9:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update httplib2 library to version 0.32.0 or later.
- Apply security patches to the HTTP server if compromised.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59939.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59939 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59939
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59939 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59939 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 20, 2026
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2026/08/msg00039.html -
Initial Analysis by [email protected]
Jul. 13, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:httplib2_project:httplib2:*:*:*:*:*:python:*:* versions up to (excluding) 0.32.0 Added Reference Type GitHub, Inc.: https://github.com/httplib2/httplib2/commit/87581ad6cf752fe3da2090c59058261d2d00a427 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/httplib2/httplib2/releases/tag/v0.32.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3 Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3 Added SSVC {'id': 'CVE-2026-59939', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-10T14:55:00.644314Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'httplib2', 'product': 'httplib2', 'versions': [{'status': 'affected', 'version': '< 0.32.0'}]}] Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-409 Added Reference https://github.com/httplib2/httplib2/commit/87581ad6cf752fe3da2090c59058261d2d00a427 Added Reference https://github.com/httplib2/httplib2/releases/tag/v0.32.0 Added Reference https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3