CVE-2026-87863
Fixed in a distro release EPSS <1%
An authenticated HTTPS origin can supply an HSTS `max-age` value that the parser accepts, but time serialization later fails to process. On 64-bit systems, extreme max-age values compute an absolute expiry within standard time integer limits that exceeds calendar time structure bounds. During cache saves, the original HSTS file is truncated before writing a temporary replacement; when serialization fails, the temporary file is deleted, leaving an empty or partial cache. Because the save error is silently ignored during cleanup, curl exits successfully despite the data loss.
Products: curl
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.23 | curl | 8.23.0-r0 |
| Alpine 3.24 | curl | 8.23.0-r0 |
| Debian 13 | curl | no fix |
| Debian 14 | curl | no fix |
| Red Hat hummingbird 1 | curl | 0:8.23.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl | 0:8.23.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl-devel | 0:8.23.0-0.1.hum1 |
| Red Hat hummingbird 1 | libcurl-minimal | 0:8.23.0-0.1.hum1 |
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.30 |
| Ubuntu 24.04 LTS | curl | 8.5.0-2ubuntu10.16 |
| Ubuntu 26.04 LTS | curl | 8.18.0-1ubuntu2.8 |
| Ubuntu 26.10 | curl | 8.20.0-2ubuntu11.1 |
| Ubuntu Pro 14.04 LTS | curl | 7.35.0-1ubuntu2.20+esm24 |
| Ubuntu Pro 16.04 LTS | curl | 7.47.0-1ubuntu2.19+esm21 |
| Ubuntu Pro 18.04 LTS | curl | 7.58.0-2ubuntu3.24+esm15 |
| Ubuntu Pro 20.04 LTS | curl | 7.68.0-1ubuntu2.25+esm10 |
| openSUSE Tumbleweed | curl | 8.23.0-1.1 |