SnakeYAML End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all SnakeYAML versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
| Version | Latest Release | Release Date | EOL Date | Days | Status |
|---|---|---|---|---|---|
| 1 | 1.33 | Aug 26, 2009 | Feb 26, 2023 | 1228 days past EOL | EOL |
| 2 | 2.6 | Feb 26, 2023 | TBD | Supported | Active |
SnakeYAML lifecycle status — the real story
SnakeYAML is the JVM's default YAML parser — Spring Boot configuration parsing alone puts it in most Java stacks. Its lifecycle broke cleanly in two in February 2023: SnakeYAML 2.0 changed the default to safe loading in response to CVE-2022-1471, a deserialization flaw that allowed remote code execution when parsing untrusted YAML with the 1.x defaults. The 1.x line ended at 1.33 (September 2022) and receives no further fixes.
The 2.x line is actively maintained (2.6 shipped February 2026), but 1.x remains ubiquitous through transitive dependencies — frameworks pinned old SnakeYAML for API-compatibility reasons for years after 2.0 shipped.
Any application parsing YAML from untrusted sources on SnakeYAML 1.x should treat the upgrade as a security remediation, not routine maintenance.
What does SnakeYAML end of life mean for your organization?
When a version of SnakeYAML reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the accumulation of unpatched vulnerabilities in EOL software. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no patch will ever exist. This is the most dangerous gap in enterprise security posture.
Organizations running EOL SnakeYAML should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Extended Support Options
If you cannot migrate immediately, extended support vendors provide continued security patches for EOL SnakeYAML versions. This is a bridge, not a permanent solution — plan your migration in parallel.
We work with vetted extended support vendors. Tell us what you need and we'll connect you with the right provider.
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