SnakeYAML 1 · Version Status
SnakeYAML 1 End of Life Date
SnakeYAML 1 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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SnakeYAML 1 is past end of life. This version no longer receives security patches. 1228 days past EOL — migrate to a supported version immediately.
EOL Date
Feb 26, 2023
1228 days past EOL
Latest Release
1.33
Standard release
Release Date
Aug 26, 2009
SnakeYAML 1 series
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended SnakeYAML 1 support is available
Commercial vendors offer security patches beyond EOL — compare your options.
Compare Options →
| Version | Latest | EOL Date | Status |
|---|
| → 1 |
1.33 |
Feb 26, 2023 |
EOL |
| 2 |
2.6 |
EOL |
Active |
What does SnakeYAML 1 end of life mean?
When SnakeYAML 1 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running SnakeYAML 1 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to SnakeYAML 2 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does SnakeYAML 1 reach end of life?
SnakeYAML 1 reached end of life on February 26, 2023. This version is no longer receiving security patches.
Is SnakeYAML 1 still supported?
No. SnakeYAML 1 reached end of life on February 26, 2023 and is no longer receiving security patches.
What should I upgrade to from SnakeYAML 1?
The recommended upgrade from SnakeYAML 1 is
SnakeYAML 2 — the latest actively supported version. Check the
SnakeYAML full timeline for all supported versions.
What are the security risks of running SnakeYAML 1 past EOL?
When SnakeYAML 1 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL SnakeYAML should migrate immediately or implement compensating controls.