CVE-2026-87863

Name	CVE-2026-87863
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
curl (PTS)	bookworm	7.88.1-10+deb12u15	fixed
	bookworm (security)	7.88.1-10+deb12u5	fixed
	trixie	8.14.1-2+deb13u5	vulnerable
	trixie (security)	8.14.1-2+deb13u7	vulnerable
	forky	8.22.0-1	vulnerable
	sid	8.23.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
curl	source	bookworm	(not affected)
curl	source	(unstable)	8.23.0~rc1-1

Notes

[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <not-affected> (Vulnerable code not present)
https://curl.se/docs/CVE-2026-87863.html
Introduced with: https://github.com/curl/curl/commit/0c667188e0c6cda615a036b8a2b4125f2c404dde (curl-8_2_0)
Fixed by: https://github.com/curl/curl/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e (rc-8_23_0-1)