No exploitation reportedFix available

CVE-2019-16056

No exploitation reported by the sources we read.

Published2019-09-06
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2019-09-0618:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-16056?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-16056?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Python

Branch	Affected	Fixed in	Source
2.7	≤ 2.7.16	no fix published	NVD
3.0	≥ 3.0.0, ≤ 3.0.1	no fix published	NVD
3.1	≥ 3.1.0, ≤ 3.1.5	no fix published	NVD
3.2	≥ 3.2.0, ≤ 3.2.6	no fix published	NVD
3.3	≥ 3.3.0, ≤ 3.3.7	no fix published	NVD
3.4	≥ 3.4.0, ≤ 3.4.10	no fix published	NVD
3.5	≥ 3.5.0, ≤ 3.5.7	no fix published	NVD
3.6	≥ 3.6.0, ≤ 3.6.9	no fix published	NVD
3.7	≥ 3.7.0, ≤ 3.7.4	no fix published	NVD

Canonical ubuntu linux

Branch	Affected	Fixed in	Source
12.4	= 12.04	no fix published	NVD
14.4	= 14.04	no fix published	NVD
16.4	= 16.04	no fix published	NVD
18.4	= 18.04	no fix published	NVD
19.4	= 19.04	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
29.x	= 29	no fix published	NVD
30.x	= 30	no fix published	NVD
31.x	= 31	no fix published	NVD

7 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

python2-attrsAlmaLinux:8all versions · fixed in 17.4.0-10.module_el8.6.0+2781+fed64c13
python2-chardetAlmaLinux:8all versions · fixed in 3.0.4-10.module_el8.6.0+2781+fed64c13
python2-coverageAlmaLinux:8all versions · fixed in 4.5.1-4.module_el8.6.0+2781+fed64c13
python2-CythonAlmaLinux:8all versions · fixed in 0.28.1-7.module_el8.6.0+2781+fed64c13
python2-dnsAlmaLinux:8all versions · fixed in 1.15.0-10.module_el8.6.0+2781+fed64c13
python2-docsAlmaLinux:8all versions · fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13and 1 other package
python2-docutilsAlmaLinux:8all versions · fixed in 0.14-12.module_el8.6.0+2781+fed64c13
python2-funcsigsAlmaLinux:8all versions · fixed in 1.0.2-13.module_el8.6.0+2781+fed64c13

16 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-10-07
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.32026-10-07
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CISA-ADPweakness (CWE)CWE-202026-10-07
FIRST EPSSEPSS score5.1 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2019-09-06
Last Modified: 2026-10-14
NVD status: Modified

Frequently asked questions

What is CVE-2019-16056?

Is CVE-2019-16056 actively exploited?

Active exploitation of CVE-2019-16056 has not been confirmed. Its EPSS score was 5.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-16056?

CVE-2019-16056 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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