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Vulnerability record · CVE-2018-1060 · published 18 June 2018

CVE-2018-1060: Python improper input validation vulnerability

Python · Python

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in pop3lib's apop() method. An attacker could use this flaw to cause denial of service.

7.5 CVSS 3.1 High EPSS 5.0% · top 8.0% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
44References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in pop3lib's apop() method. An attacker could use this flaw to cause denial of service.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
http://www.securitytracker.com/id/1042001 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHBA-2019:0327 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3041 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3505 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1260 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://bugs.python.org/issue32981 ExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1060 Issue TrackingThird Party Advisory
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-6-release-candidate-1 ProductVendor Advisory
https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-5-release-candidate-1 ProductVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00030.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00031.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGO
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03951en_us Third Party Advisory
https://usn.ubuntu.com/3817-1/ Third Party Advisory
https://usn.ubuntu.com/3817-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4306 Third Party Advisory
https://www.debian.org/security/2018/dsa-4307 Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.html Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
http://www.securitytracker.com/id/1042001 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHBA-2019:0327 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3041 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3505 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1260 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://bugs.python.org/issue32981 ExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1060 Issue TrackingThird Party Advisory
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-6-release-candidate-1 ProductVendor Advisory
https://docs.python.org/3.6/whatsnew/changelog.html#python-3-6-5-release-candidate-1 ProductVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00030.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00031.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/46PVWY5LFP4BRPG3BVQ5QEE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AEZ5IQT7OF7Q2NCGIVABOWY
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JSKPGPZQNTAULHW4UH63KGO
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03951en_us Third Party Advisory
https://usn.ubuntu.com/3817-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-1060), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.