CVE-2026-59939: httplib2 is a comprehensive HTTP client library for Python

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HIGH 7.5REMOTEUPGRADE

CVE-2026-59939 is a high-severity flaw (CVSS 7.5) affecting httplib2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-409
Published	2026-07-08
Last modified	2026-08-20

Publisher (CNA): GitHub, Inc. · Vendor: httplib2 project

Last updated 2026-08-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 20:16 UTCPublished CVE record published
2026-08-20 21:17 UTCUpdated Record last modified

httplib2 project httplib2 UPGRADE

Affected: < 0.32.0

Fixed in: 0.32.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show httplib2

2. UPGRADE to 0.32.0

pip install --upgrade "httplib2>=0.32.0"

Advisories and coverage

Official advisories

Amazon Linux 2 ALAS: ALAS2-2026-3988 (medium): fence-agents 2026-10-12
AlmaLinux Errata: [ALSA-2026:50317] Important: fence-agents security update 2026-08-06

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-59939?

httplib2: upgrade to 0.32.0. Exact commands for each OS are on this page.

Is CVE-2026-59939 being exploited?

CVE-2026-59939 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-59939 affect?

CVE-2026-59939 affects httplib2. Severity is high (CVSS 7.5). 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, allowin

How urgent is CVE-2026-59939?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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