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Fencer Intel
medium 6.5

CVE-2018-20574 json

The SingleDocParser::HandleFlowMap function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cause a denial of service (stack…

published 7y ago modified 4mo ago also EUVD-2018-13128

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

The SingleDocParser::HandleFlowMap function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cause a denial of service (stack consumption and application crash) via a crafted YAML file.

Patch / fix

  • yaml-cpp Debian 14, Debian 13, Debian 12 0.6.3-1

debian advisories DEBIAN-CVE-2018-20574

  • yaml-cpp SLE Real Time 15 SP2, SLE Module for Desktop Applications 15 SP3, SLE Module for Basesystem 15 SP3 +8 more 0.6.1-4.5.1
  • yaml-cpp SLE Workstation Extension 12 SP5 0.5.3-3.6.3

suse advisories SUSE-SU-2023:1740-3SUSE-SU-2022:1073-2SUSE-SU-2022:1073-1SUSE-SU-2022:1072-1

  • yaml-cpp openSUSE Leap 15.3 0.6.1-4.5.1

opensuse advisories openSUSE-SU-2022:1073-1

  • yaml-cpp CBL-Mariner 2.0 0.6.2-6

azure linux advisories AZL-7007

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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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-2018-20574 updated cvss 3.7

yaml-cpp: DoS in SingleDocParser::HandleFlowMap function

  • Red Hat OpenStack Platform 8 (Liberty) yaml-cpp Red Hat OpenStack Platform 9 (Mitaka) yaml-cpp Red Hat OpenStack Platform 10 (Newton) yaml-cpp Red Hat OpenStack Platform 13 (Queens) yaml-cpp
    affected: no fix available “Fix deferred”
  • Red Hat OpenStack Platform 14 (Rocky) yaml-cpp
    affected: no fix available
  • Red Hat Satellite 6 yaml-cpp Red Hat Software Collections rh-mongodb32-yaml-cpp, rh-mongodb34-yaml-cpp, rh-mongodb36-yaml-cpp
    affected: no fix planned “Will not fix”

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

2.53% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/jbeder/yaml-cpp/issues/654 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.