httplib unlimited read


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The canonical database for vulnerabilities affecting Python is available on GitHub in the Open Source Vulnerability (OSV) format. This vulnerability can be viewed online at the Open Source Vulnerability Database.

Limit the HTTP header readline.


  • Disclosure date: 2009-08-28 (Python issue bpo-6791 reported)
  • Red Hat impact: Moderate

Fixed In

Python issue

httplib read status memory usage.

  • Python issue: bpo-6791
  • Creation date: 2009-08-28
  • Reporter: sumar


** REJECT ** Various versions of Python do not properly restrict readline calls, which allows remote attackers to cause a denial of service (memory consumption) via a long string, related to (1) httplib - fixed in 2.7.4, 2.6.9, and 3.3.3; (2) ftplib - fixed in 2.7.6, 2.6.9, 3.3.3; (3) imaplib - not yet fixed in 2.7.x, fixed in 2.6.9, 3.3.3; (4) nntplib - fixed in 2.7.6, 2.6.9, 3.3.3; (5) poplib - not yet fixed in 2.7.x, fixed in 2.6.9, 3.3.3; and (6) smtplib - not yet fixed in 2.7.x, fixed in 2.6.9, not yet fixed in 3.3.x. NOTE: this was REJECTed because it is incompatible with CNT1 “Independently Fixable” in the CVE Counting Decisions.


Timeline using the disclosure date 2009-08-28 as reference: