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HIGH

CVE-2026-59939

CVSS v3

7.5

HIGH

EPSS Score

0.7 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • httplib2PyPIall versions · fixed in 0.32.0
  • fence-agents-apcAlmaLinux:8all versions · fixed in 4.2.1-129.el8_10.27and 47 other packages
  • fence-virtdAlmaLinux:10all versions · fixed in 4.16.0-21.el10_2.5and 54 other packages
  • fence-virtdAlmaLinux:9all versions · fixed in 4.10.0-110.el9_8.5and 55 other packages

Vendor advisories

  • CVE-2026-59939 Red Hat Product Security1,223 products fixed · 46 known affected

    httplib2: httplib2: Denial of Service via unbounded decompression of HTTP response bodies

    ansible-automation-platform-24/lightspeed-rhel8 as a component of Red Hat Ansible Automation Platform 2 · fence-agents-aliyun as a component of Red Hat Enterprise Linux 7 · fence-agents-all as a component of Red Hat Enterprise Linux 7

  • RHSA-2026:50655 Red Hat Product Security189 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:50654 Red Hat Product Security96 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:50653 Red Hat Product Security189 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:50479 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

  • RHSA-2026:50317 Red Hat Product Security96 products fixed

    Red Hat Security Advisory: fence-agents security update

9 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-07-08
Last Modified
2026-07-08

Frequently asked questions

What is CVE-2026-59939?

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.

Is CVE-2026-59939 actively exploited?

Active exploitation of CVE-2026-59939 has not been confirmed. Its EPSS score was 0.7% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-59939?

CVE-2026-59939 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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