HSTS response erases persisted entries

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-87863
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 21:17:20 UTC
Updated2026-10-20 21:17:20 UTC
DescriptionAn 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.

Risk And Classification

Problem Types: CWE-201 Information Exposure Through Sent Data

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.22.0 8.22.0 semver Not specified
CNA Curl Curl affected 8.21.0 8.21.0 semver Not specified
CNA Curl Curl affected 8.20.0 8.20.0 semver Not specified
CNA Curl Curl affected 8.19.0 8.19.0 semver Not specified
CNA Curl Curl affected 8.18.0 8.18.0 semver Not specified
CNA Curl Curl affected 8.17.0 8.17.0 semver Not specified
CNA Curl Curl affected 8.16.0 8.16.0 semver Not specified
CNA Curl Curl affected 8.15.0 8.15.0 semver Not specified
CNA Curl Curl affected 8.14.1 8.14.1 semver Not specified
CNA Curl Curl affected 8.14.0 8.14.0 semver Not specified
CNA Curl Curl affected 8.13.0 8.13.0 semver Not specified
CNA Curl Curl affected 8.12.1 8.12.1 semver Not specified
CNA Curl Curl affected 8.12.0 8.12.0 semver Not specified
CNA Curl Curl affected 8.11.1 8.11.1 semver Not specified
CNA Curl Curl affected 8.11.0 8.11.0 semver Not specified
CNA Curl Curl affected 8.10.1 8.10.1 semver Not specified
CNA Curl Curl affected 8.10.0 8.10.0 semver Not specified
CNA Curl Curl affected 8.9.1 8.9.1 semver Not specified
CNA Curl Curl affected 8.9.0 8.9.0 semver Not specified
CNA Curl Curl affected 8.8.0 8.8.0 semver Not specified
CNA Curl Curl affected 8.7.1 8.7.1 semver Not specified
CNA Curl Curl affected 8.7.0 8.7.0 semver Not specified
CNA Curl Curl affected 8.6.0 8.6.0 semver Not specified
CNA Curl Curl affected 8.5.0 8.5.0 semver Not specified
CNA Curl Curl affected 8.4.0 8.4.0 semver Not specified
CNA Curl Curl affected 8.3.0 8.3.0 semver Not specified
CNA Curl Curl affected 8.2.1 8.2.1 semver Not specified
CNA Curl Curl affected 8.2.0 8.2.0 semver Not specified

References

ReferenceSourceLinkTags
curl.se/docs/CVE-2026-87863.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
curl.se/docs/CVE-2026-87863.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
hackerone.com/reports/3972373 2499f714-1537-4658-8207-48ae4bb9eae9 hackerone.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Stanislav Fort (Aisle Research) (en)

CNA: Daniel Stenberg (en)

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