CVE-2017-11692: The function "Token& Scanner::peek" in scanner.cpp in yaml-cpp 0.5.3 and earlier allows remote attackers to ca

Q: How do I fix CVE-2017-11692?

yaml-cpp: upgrade to newer than 0.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2017-11692 being exploited?

CVE-2017-11692 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-11692 affect?

CVE-2017-11692 affects yaml-cpp. Severity is high (CVSS 7.5). The function "Token& Scanner::peek" in scanner.cpp in yaml-cpp 0.5.3 and earlier allows remote attackers to cause a denial of service (assertion failure and application exit) via a '!2' string.

Q: How urgent is CVE-2017-11692?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2017-11692 is a high-severity flaw (CVSS 7.5) affecting yaml-cpp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The function "Token& Scanner::peek" in scanner.cpp in yaml-cpp 0.5.3 and earlier allows remote attackers to cause a denial of service (assertion failure and application exit) via a '!2' string.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-617
Published	2017-07-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yaml-cpp project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-07-30 17:29 UTCPublished CVE record published
2026-06-17 01:02 UTCUpdated Record last modified

yaml-cpp project yaml-cpp UPGRADE

Affected: <= 0.5.3

Fixed in: newer than 0.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy yaml-cpp || rpm -q yaml-cpp || yaml-cpp --version

2. UPGRADE to newer than 0.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yaml-cpp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yaml-cpp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-11692?

yaml-cpp: upgrade to newer than 0.5.3. Exact commands for each OS are on this page.

Is CVE-2017-11692 being exploited?

CVE-2017-11692 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-11692 affect?

CVE-2017-11692 affects yaml-cpp. Severity is high (CVSS 7.5). The function "Token& Scanner::peek" in scanner.cpp in yaml-cpp 0.5.3 and earlier allows remote attackers to cause a denial of service (assertion failure and application exit) via a '!2' string.

How urgent is CVE-2017-11692?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2018-20574 MEDIUM 6.5 DOWNGRADE The SingleDocParser::HandleFlowMap function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cau
CVE-2018-20573 MEDIUM 6.5 DOWNGRADE The Scanner::EnsureTokensInQueue function in yaml-cpp (aka LibYaml-C++) 0.6.2 allows remote attackers to cause
CVE-2017-5950 MEDIUM 5.5 DOWNGRADE The SingleDocParser::HandleNode function in yaml-cpp (aka LibYaml-C++) 0.5.3 allows remote attackers to cause

References

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