CoAPthon3 vulnerable to Deserialization of Untrusted Data

published 2019-04-02 7 y ago modified 2026-06-17 4 mo ago also GHSA-c6fm-rgw4-8q73 , PYSEC-2019-166 , EUVD-2019-0029

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits: 0; none known

The Serialize.deserialize() method in CoAPthon3 1.0 and 1.0.1 mishandles certain exceptions, leading to a denial of service in applications that use this library (e.g., the standard CoAP server, CoAP client, example collect CoAP server and client) when they receive crafted CoAP messages.

Exploit prediction

1.49% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Tanganelli/CoAPthon3/issues/16 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	coapthon3	<=1.0.1 >=1.0	no fix listed

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

github.com /Tanganelli/CoAPthon3/issues/16
web, exploit, issue-tracking, third-party-advisory, report
nvd.nist.gov /vuln/detail/CVE-2018-12679
advisory
github.com /Tanganelli/CoAPthon3
package
github.com /advisories/GHSA-c6fm-rgw4-8q73
advisory
github.com /pypa/advisory-database/tree/main/vulns/coapthon3/PYSEC-2019-166.yaml
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary