Home/CVE/The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-
CVE

CVE-2017-18640

The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-

The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-1564.

HIGH · CVSS 7.5 EPSS 0.02766
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
▤

Affected Products & Versions

4
snakeyaml project snakeyaml< 1.26
fedoraproject fedoraall versions
quarkus<= 1.3.4
oracle peoplesoft enterprise pt peopletoolsall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.yaml:snakeyaml HIGH fixed in 1.26
⚠

Public Exploits & PoCs

2
pocbitbucket.org · allow-configuration-for-preventing-billionbitbucket.org
pocbitbucket.org · issues/377bitbucket.org
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Dec 2019 · 03:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

12
msrcCVE-2017-18640
usnUSN-7368-1
suse-csafopenSUSE-SU-2024:11391-1
suse-csafopenSUSE-SU-2021:1876-1
rhsaRHSA-2021:3225Low
🔗

References & Sources

57
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bitbucket.org/asomov/snakeyaml/wiki/BillionThird Party Advisory
https://bitbucket.org/snakeyaml/snakeyaml/wiki/ChangesRelease NotesThird Party Advisory
https://lists.apache.org/thread.html/r1058e7646988394de6a3fd0857ea9b1ee0de14d7bb28fee5ff782457%40%3Ccommits.atlas.apache.org%3E
https://lists.apache.org/thread.html/r154090b871cf96d985b90864442d84eb027c72c94bc3f0a5727ba2d1%40%3Ccommon-issues.hadoop.apache.org%3E
https://lists.apache.org/thread.html/r16ae4e529401b75a1f5aa462b272b31bf2a108236f882f06fddc14bc%40%3Ccommon-issues.hadoop.apache.org%3E
https://lists.apache.org/thread.html/r1703a402f30c8a2ee409f8c6f393e95a63f8c952cc9ee5bf9dd586dc%40%3Ccommits.cassandra.apache.org%3E
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