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Vulnerability record · CVE-2017-18640 · published 12 December 2019

CVE-2017-18640: Snakeyaml project snakeyaml vulnerability

Snakeyaml Project · Snakeyaml

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

7.5 CVSS 3.1 High EPSS 27% · top 2.0% CWE-776 · CWE-776
7.5CVSS 3.1 base score, v2 5.0
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
118References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bitbucket.org/asomov/snakeyaml/issues/377/allow-configuration-for-preventing-billion ExploitIssue TrackingPatchThird Party Advisory
https://bitbucket.org/asomov/snakeyaml/wiki/Billion%20laughs%20attack Third Party Advisory
https://bitbucket.org/snakeyaml/snakeyaml/issues/377 ExploitIssue TrackingThird Party Advisory
https://bitbucket.org/snakeyaml/snakeyaml/wiki/Changes Release NotesThird Party Advisory
https://lists.apache.org/thread.html/r1058e7646988394de6a3fd0857ea9b1ee0de14d7bb28fee5ff782457%40%3Ccommits.atlas.apache
https://lists.apache.org/thread.html/r154090b871cf96d985b90864442d84eb027c72c94bc3f0a5727ba2d1%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r16ae4e529401b75a1f5aa462b272b31bf2a108236f882f06fddc14bc%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r1703a402f30c8a2ee409f8c6f393e95a63f8c952cc9ee5bf9dd586dc%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r182e9cf6f3fb22b9be0cac4ff0685199741d2ab6e9a4e27a3693c224%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r191ceadb1b883357384981848dfa5235cb02a90070c553afbaf9b3d9%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r1aab47b48a757c70e40fc0bcb1fcf1a3951afa6a17aee7cd66cf79f8%40%3Ccommon-commits.hadoo
https://lists.apache.org/thread.html/r1dfac8b6a7097bcb4979402bbb6e2f8c36d0d9001e3018717eb22b7e%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r1ffce2ed3017e9964f03ad2c539d69e49144fc8e9bf772d641612f98%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r20350031c60a77b45e0eded33e9b3e9cb0cbfc5e24e1c63bf264df12%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r22ac2aa053b7d9c6b75a49db78125c9316499668d0f4a044f3402e2f%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.o
https://lists.apache.org/thread.html/r28c9009a48d52cf448f8b02cd823da0f8601d2dff4d66f387a35f1e0%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r2a5b84fdf59042dc398497e914b5bb1aed77328320b1438144ae1953%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r2b05744c0c2867daa5d1a96832965b7d6220328b0ead06c22a6e7854%40%3Ccommits.pulsar.apach
https://lists.apache.org/thread.html/r2db207a2431a5e9e95e899858ab1f5eabd9bcc790a6ca7193ae07e94%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r436988d2cfe8a770ae361c82b181c5b2bf48a249bad84d8a55a3b46e%40%3Cdev.phoenix.apache.o
https://lists.apache.org/thread.html/r465d2553a31265b042cf5457ef649b71e0722ab89b6ea94a5d59529b%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r4c682fb8cf69dd14162439656a6ebdf42ea6ad0e4edba95907ea3f14%40%3Ccommits.servicecomb.
https://lists.apache.org/thread.html/r4d7f37da1bc2df90a5a0f56eb7629b5ea131bfe11eeeb4b4c193f64a%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r5510f0125ba409fc1cabd098ab8b457741e5fa314cbd0e61e4339422%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r55d807f31e64a080c54455897c20b1667ec792e5915132c7b7750533%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r56805265475919252ba7fc10123f15b91097f3009bae86476624ca25%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/r643ba53f002ae59068f9352fe1d82e1b6f375387ffb776f13efe8fda%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r666f29a7d0e1f98fa1425ca01efcfa86e6e3856e01d300828aa7c6ea%40%3Ccommits.pulsar.apach
https://lists.apache.org/thread.html/r6c91e52b3cc9f4e64afe0f34f20507143fd1f756d12681a56a9b38da%40%3Ccommits.pulsar.apach
https://lists.apache.org/thread.html/r6d54c2da792c74cc14b9b7665ea89e144c9e238ed478d37fd56292e6%40%3Cdev.atlas.apache.org
https://lists.apache.org/thread.html/r72a3588d62b2de1361dc9648f5d355385735e47f7ba49d089b0e680d%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r7ce3de03facf7e7f3e24fc25d26d555818519dafdb20f29398a3414b%40%3Cdev.phoenix.apache.o
https://lists.apache.org/thread.html/r8464b6ec951aace8c807bac9ea526d4f9e3116aa16d38be06f7c6524%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/r8b57c57cffa01e418868a3c7535b987635ff1fb5ab534203bfa2d64a%40%3Ccommits.pulsar.apach
https://lists.apache.org/thread.html/r900e020760c89f082df1c6e0d46320eba721e4e47bb9eb521e68cd95%40%3Ccommits.servicecomb.
https://lists.apache.org/thread.html/raebd2019b3da8c2f90f31e8b203b45353f78770ca93bfe5376f5532e%40%3Ccommon-issues.hadoop
https://lists.apache.org/thread.html/rb0e033d5ec8233360203431ad96580cf2ec56f47d9a425d894e279c2%40%3Cpr.cassandra.apache.
https://lists.apache.org/thread.html/rb34d8d3269ad47a1400f5a1a2d8310e13a80b6576ebd7f512144198d%40%3Ccommon-dev.hadoop.ap
https://lists.apache.org/thread.html/rb5c33d0069c927fae16084f0605895b98d231d7c48527bcb822ac48c%40%3Ccommits.cassandra.ap

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Source: NIST National Vulnerability Database (record CVE-2017-18640), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.