ftplib 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.

ftplib: unlimited read from connection.


  • Disclosure date: 2012-09-25 (Python issue bpo-16038 reported)
  • Red Hat impact: Moderate

Fixed In

Python issue

ftplib: unlimited readline() from connection.

  • Python issue: bpo-16038
  • Creation date: 2012-09-25
  • Reporter: Christian Heimes


** 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 2012-09-25 as reference: