What’s Vulnerable › Vulnerabilities

CVE-2026-59939: httplib2: Decompression Bomb Denial of Service via Unbounded gzip/deflate Response Handling

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-08 · updated 2026-08-20
• Weakness: CWE-409

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.

Affected products

• httplib2: before 0.32.0 — fixed in 0.32.0

How to fix

Upgrade to a fixed version: httplib2 0.32.0. Check the vendor advisory for mitigations.

References

• https://github.com/httplib2/httplib2/commit/87581ad6cf752fe3da2090c59058261d2d00a427
• https://github.com/httplib2/httplib2/releases/tag/v0.32.0
• https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3
• https://lists.debian.org/debian-lts-announce/2026/08/msg00039.html
• https://github.com/httplib2/httplib2/security/advisories/GHSA-j5g9-f88f-gfj3

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