7.5

CVE-2019-16056: canonical ubuntu_linux Improper Input Validation

Modified
AliasesALPINE-CVE-2019-16056SUSE-RU-2020:1342-1SUSE-SU-2021:14198-1
Published 06-09-2019Last modified 14-10-2026

Vulnerability summary

CVE-2019-16056 is a high (CVSS 7.5) Improper Input Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 5.12% chance of exploitation in the next 30 days, higher than 92.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
5.12%
0%100%
Low · -0.25 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 20
DLA-2280-1DLA-2337-1MGASA-2019-0318OPENSUSE-SU-2019:2389-1OPENSUSE-SU-2019:2393-1OPENSUSE-SU-2019:2438-1

Timeline

  1. 06-09-2019
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Python through 2.7.16, 3.x through 3.5.7, 3.6.x through 3.6.9, and 3.7.x through 3.7.4. The email module wrongly parses email addresses that contain multiple @ characters. An application that uses the email module and implements some kind of checks on the From/To headers of a message could be tricked into accepting an email address that should be denied. An attack may be the same as in CVE-2019-11340; however, this CVE applies to Python more generally.

CVSS metrics

7 scores · 6 sources · 3 versions

EPSS trend

Probability

5.12%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

Decrease -0.25 pp

From 5.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat9 products
  • software_collections1.0
  • python< 0:2.7.5-87.el7_7
  • python-debug< 0:2.7.5-87.el7_7
  • python-debuginfo< 0:2.7.5-87.el7_7
  • python-devel< 0:2.7.5-87.el7_7
Suse9 products
  • python-base&distro=SUSE Linux Enterprise Point of Sale 11 SP3< 2.6.9-40.32.1
  • python-base&distro=SUSE Linux Enterprise Server 11 SP4-LTSS< 2.6.9-40.32.1
  • python-doc&distro=SUSE Linux Enterprise Point of Sale 11 SP3< 2.6-8.40.32.1
  • python-doc&distro=SUSE Linux Enterprise Server 11 SP4-LTSS< 2.6-8.40.32.1
  • python3-base&distro=SUSE Linux Enterprise Module for Basesystem 15 SP1< 3.6.10-3.53.1
Oracle4 products
Ubuntu4 products
  • python2.7< 2.7.6-8ubuntu0.6+esm3 | < 2.7.12-1ubuntu0~16.04.9 | < 2.7.15-4ubuntu4~18.04.2
  • python3.4< 3.4.3-1ubuntu1~14.04.7+esm4
  • python3.5< 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1 | < 3.5.2-2ubuntu0~16.04.9
  • python3.6< 3.6.8-1~18.04.3
Alpine3 products
  • python2< 2.7.16-r3
  • python2-tkinter< 2.7.17-r0
  • python3< 3.7.5-r0 | < 3.6.8-r1 | < 3.6.9-r1
Debian3 products
  • python2.7< 2.7.17~rc1-1 | < 2.7.9-2+deb8u5
  • python3.4< 3.4.2-1+deb8u7
  • debian_linuxEOL8.0 | 9.0
Canonical1 product
Fedoraproject1 product
Opensuse1 product
Python1 product
  • python≤ 2.7.16 | ≥ 3.0.0, ≤ 3.0.1 | ≥ 3.1.0, ≤ 3.1.5 | ≥ 3.2.0, ≤ 3.2.6 | ≥ 3.3.0, ≤ 3.3.7 | ≥ 3.4.0, ≤ 3.4.10 | ≥ 3.5.0, ≤ 3.5.7 | ≥ 3.6.0, ≤ 3.6.9 | ≥ 3.7.0, ≤ 3.7.4

10 vendors · 36 products

References

53 links
Show all 53 references