Container-Optimized OS cos-129 End of Life Date
Container-Optimized OS cos-129 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
Container-Optimized OS cos-129 was released on May 21, 2026 and support is scheduled to end on March 1, 2028 — a planned supported lifespan of 1 year and 10 months, in line with the 1 year and 11 months median for Container-Optimized OS LTS releases. It is a long-term support (LTS) release, so it carries a longer patch window than the interim releases around it. Its most recent patch is cos-129-19506-448-8, published August 31, 2026.
| Version | Latest | EOL Date | Status |
|---|---|---|---|
| cos-69 LTS | cos-69-10895-385-0 | Dec 1, 2019 | EOL |
| cos-73 LTS | cos-73-11647-656-0 | Sep 5, 2020 | EOL |
| cos-77 LTS | cos-77-12371-1109-0 | Apr 1, 2021 | EOL |
| cos-81 LTS | cos-81-12871-1317-8 | Jan 10, 2022 | EOL |
| cos-85 LTS | cos-85-13310-1498-13 | Sep 1, 2022 | EOL |
| cos-89 LTS | cos-89-16108-798-22 | Mar 1, 2023 | EOL |
| cos-93 LTS | cos-93-16623-461-42 | Oct 24, 2023 | EOL |
| cos-97 LTS | cos-97-16919-450-41 | Mar 27, 2024 | EOL |
What does Container-Optimized OS cos-129 end of life mean?
When Container-Optimized OS cos-129 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 Container-Optimized OS cos-129 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Container-Optimized OS cos-129 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.