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Fencer Intel
medium 6.1

CVE-2017-15612 json

Cross-site Scripting in Mistune

published 9y ago modified 4mo ago also GHSA-hpv5-v8g5-c864 , PYSEC-2017-80 , EUVD-2017-0075

cvss
6.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

mistune.py in Mistune 0.7.4 allows XSS via an unexpected newline (such as in java\nscript:) or a crafted email address, related to the escape and autolink functions.

Patch / fix

  • pypi mistune 0.8
  • mistune Debian 14, Debian 13, Debian 12 0.8-1

debian advisories DEBIAN-CVE-2017-15612

  • python-mistune openSUSE Tumbleweed 3.3.4-1.1
  • python-mistune openSUSE Tumbleweed 3.0.2-2.5

opensuse advisories openSUSE-SU-2026:11585-1openSUSE-SU-2024:14148-1

Is CVE-2017-15612 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-15612 updated cvss 6.1

python-mistune: XSS via an unexpected newline / crafted email address

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/lepture/mistune/pull/140 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi mistune
<0.8
0.8

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel 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.