CVE-2026-87863: HSTS response erases persisted entries
Affected: curl · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 58% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- curl · curlfrom 8.22.0 up to and including 8.22.0; from 8.21.0 up to and including 8.21.0; from 8.20.0 up to and including 8.20.0; from 8.19.0 up to and including 8.19.0; from 8.18.0 up to and including 8.18.0; from 8.17.0 up to and including 8.17.0 and 22 more
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- curl
- Published
- October 2026
- Bounty reports
- 1 disclosed on HackerOne
Disclosed bug bounty reports about CVE-2026-87863
The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.
- CVE-2026-87863: HSTS response erases persisted entriescurl · 2026Valid
CoverageNo articles yet
No CyberSIXT article names CVE-2026-87863 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.