CVE-2019-16056 (GCVE-0-2019-16056)
Vulnerability from cvelistv5 – Published: 2019-09-06 17:24 – Updated: 2026-10-07 18:14
VLAI
EPSS
VEX
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 18:12 UTC
CWE
- n/a
- CWE-20 - Improper Input Validation
Assigner
References
34 references
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"value": "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."
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{
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"value": "Se descubri\u00f3 un problema en Python versiones hasta 2.7.16, versiones 3.x hasta 3.5.7, versiones 3.6.x hasta 3.6.9 y versiones 3.7.x hasta 3.7.4. El m\u00f3dulo de correo electr\u00f3nico analiza incorrectamente las direcciones de correo electr\u00f3nico que contienen m\u00faltiples caracteres @. Una aplicaci\u00f3n que usa el m\u00f3dulo de correo electr\u00f3nico e implementa alg\u00fan tipo de comprobaci\u00f3n sobre los encabezados From/To de un mensaje podr\u00eda ser enga\u00f1ada para aceptar una direcci\u00f3n de correo electr\u00f3nico que deber\u00eda ser denegada. Un ataque puede ser el mismo que en CVE-2019-11340; sin embargo, este CVE aplica a Python de manera m\u00e1s general."
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"name": "[debian-lts-announce] 20190916 [SECURITY] [DLA 1924-1] python3.4 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2019/09/msg00018.html"
},
{
"name": "FEDORA-2019-50772cf122",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NF3DRDGMVIRYNZMSLJIHNW47HOUQYXVG/"
},
{
"name": "FEDORA-2019-5dc275c9f2",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ER6LONC2B2WYIO56GBQUDU6QTWZDPUNQ/"
},
{
"name": "FEDORA-2019-2b1f72899a",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E2HP37NUVLQSBW3J735A2DQDOZ4ZGBLY/"
},
{
"name": "USN-4151-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4151-1/"
},
{
"name": "USN-4151-2",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4151-2/"
},
{
"name": "openSUSE-SU-2019:2389",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00062.html"
},
{
"name": "openSUSE-SU-2019:2393",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00063.html"
},
{
"name": "FEDORA-2019-232f092db0",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QP46PQSUKYPGWTADQ67NOV3BUN6JM34Z/"
},
{
"name": "FEDORA-2019-986622833f",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QASRD4E2G65GGEHYKVHYCXB2XWAGTNL4/"
},
{
"name": "FEDORA-2019-aba3cca74a",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SDQQ56P7ZZR64XV5DUVWNSNXKKEXUG2J/"
},
{
"name": "openSUSE-SU-2019:2438",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00012.html"
},
{
"name": "RHSA-2019:3725",
"refsource": "REDHAT",
"url": "https://access.redhat.com/errata/RHSA-2019:3725"
},
{
"name": "openSUSE-SU-2019:2453",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00021.html"
},
{
"name": "FEDORA-2019-0d3fcae639",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K7HNVIFMETMFWWWUNTB72KYJYXCZOS5V/"
},
{
"name": "FEDORA-2019-74ba24605e",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZBTGPBUABGXZ7WH7677OEM3NSP6ZEA76/"
},
{
"name": "FEDORA-2019-b06ec6159b",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/"
},
{
"name": "FEDORA-2019-758824a3ff",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/COATURTCY7G67AYI6UDV5B2JZTBCKIDX/"
},
{
"name": "FEDORA-2019-d202cda4f8",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/"
},
{
"name": "FEDORA-2019-57462fa10d",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/"
},
{
"name": "RHSA-2019:3948",
"refsource": "REDHAT",
"url": "https://access.redhat.com/errata/RHSA-2019:3948"
},
{
"name": "FEDORA-2019-7ec5bb5d22",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BEARDOTXCYPYELKBD2KWZ27GSPXDI3GQ/"
},
{
"name": "FEDORA-2019-a268ba7b23",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OYGESQSGIHDCIGOBVF7VXCMIE6YDWRYB/"
},
{
"name": "openSUSE-SU-2020:0086",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpuapr2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpujul2020.html",
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"url": "https://www.oracle.com/security-alerts/cpujul2020.html"
},
{
"name": "https://bugs.python.org/issue34155",
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"url": "https://bugs.python.org/issue34155"
},
{
"name": "https://github.com/python/cpython/commit/8cb65d1381b027f0b09ee36bfed7f35bb4dec9a9",
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"url": "https://github.com/python/cpython/commit/8cb65d1381b027f0b09ee36bfed7f35bb4dec9a9"
},
{
"name": "https://security.netapp.com/advisory/ntap-20190926-0005/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20190926-0005/"
},
{
"name": "[debian-lts-announce] 20200715 [SECURITY] [DLA 2280-1] python3.5 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html"
},
{
"name": "[bookkeeper-issues] 20200729 [GitHub] [bookkeeper] padma81 opened a new issue #2387: Security vulnerabilities in the apache/bookkeeper-4.9.2 image",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0@%3Cissues.bookkeeper.apache.org%3E"
},
{
"name": "[debian-lts-announce] 20200822 [SECURITY] [DLA 2337-1] python2.7 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2019-16056",
"datePublished": "2019-09-06T17:24:35.000Z",
"dateReserved": "2019-09-06T00:00:00.000Z",
"dateUpdated": "2026-10-07T18:14:31.346Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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