Low
HSTS response erases persisted entries
Type: advisorySources: OSV
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
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-87863
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:38 UTC · Revision 1
Source evidence
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.
osv:CURL-CVE-2026-87863
Complete source record
{
"id": "9244015d7d0bba63329de871345e8c30190e029a5388f0dfb26502778ad1d6ab",
"url": "https://osv.dev/vulnerability/CURL-CVE-2026-87863",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "HSTS response erases persisted entries",
"summary": "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.",
"evidence": "osv:CURL-CVE-2026-87863",
"products": [],
"severity": "low",
"structured": {
"id": "CURL-CVE-2026-87863",
"aliases": [
"CURL-CVE-2026-87863",
"CVE-2026-87863"
],
"affected": [
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "8.2.0"
},
{
"fixed": "8.14.3"
},
{
"introduced": "8.15.0"
},
{
"fixed": "8.16.2"
},
{
"introduced": "8.17.0"
},
{
"fixed": "8.20.2"
},
{
"introduced": "8.21.0"
},
{
"fixed": "8.23.0"
}
]
},
{
"repo": "https://github.com/curl/curl.git",
"type": "GIT",
"events": [
{
"introduced": "0c667188e0c6cda615a036b8a2b4125f2c404dde"
},
{
"fixed": "08d50a791b3197a3d0a4fc2f778e243f5501c67e"
}
]
}
],
"versions": [
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"8.21.0",
"8.20.0",
"8.19.0",
"8.18.0",
"8.17.0",
"8.16.0",
"8.15.0",
"8.14.1",
"8.14.0",
"8.13.0",
"8.12.1",
"8.12.0",
"8.11.1",
"8.11.0",
"8.10.1",
"8.10.0",
"8.9.1",
"8.9.0",
"8.8.0",
"8.7.1",
"8.7.0",
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"rc-8_21_0-2",
"rc-8_21_0-1",
"curl-8_20_0",
"rc-8_20_0-3",
"rc-8_20_0-2",
"rc-8_20_0-1",
"curl-8_19_0",
"rc-8_19_0-3",
"rc-8_19_0-2",
"rc-8_19_0-1",
"curl-8_18_0",
"rc-8_18_0-3",
"rc-8_18_0-2",
"rc-8_18_0-1",
"curl-8_17_0",
"curl-8_16_0",
"curl-8_15_0",
"curl-8_14_1",
"curl-8_14_0",
"curl-8_13_0",
"curl-8_12_1",
"curl-8_12_0",
"curl-8_11_1",
"curl-8_11_0",
"curl-8_10_1",
"curl-8_10_0",
"curl-8_9_1",
"curl-8_9_0",
"curl-8_8_0",
"curl-8_7_1",
"curl-8_7_0",
"curl-8_6_0",
"curl-8_5_0",
"tiny-curl-8_4_0",
"curl-8_4_0",
"curl-8_3_0",
"curl-8_2_1",
"curl-8_2_0"
],
"database_specific": {
"source": "https://curl.se/docs/CURL-CVE-2026-87863.json",
"vanir_signatures": [
{
"id": "CURL-CVE-2026-87863-0af9106b",
"digest": {
"length": 1254,
"function_hash": "130716959620459958849575900228284574811"
},
"source": "https://github.com/curl/curl.git/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e",
"target": {
"file": "lib/hsts.c",
"function": "Curl_hsts_save"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CURL-CVE-2026-87863-3febfe18",
"digest": {
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"function_hash": "235220928436855776497358132967032028485"
},
"source": "https://github.com/curl/curl.git/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e",
"target": {
"file": "lib/hsts.c",
"function": "hsts_out"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CURL-CVE-2026-87863-4e8b645f",
"digest": {
"threshold": 0.9,
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"source": "https://github.com/curl/curl.git/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e",
"target": {
"file": "lib/hsts.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CURL-CVE-2026-87863-d434713a",
"digest": {
"length": 1674,
"function_hash": "96308156130170861737261897291227074129"
},
"source": "https://github.com/curl/curl.git/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e",
"target": {
"file": "lib/hsts.c",
"function": "Curl_hsts_parse"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-25T01:05:09Z"
}
}
],
"modified": "2026-10-25T01:05:09.015738093Z",
"provider": "osv",
"references": [],
"provider_metadata": {
"CWE": {
"id": "CWE-201",
"desc": "Information Exposure Through Sent Data"
},
"URL": "https://curl.se/docs/CVE-2026-87863.json",
"www": "https://curl.se/docs/CVE-2026-87863.html",
"issue": "https://hackerone.com/reports/3972373",
"affects": "both",
"package": "curl",
"severity": "Low",
"last_affected": "8.22.0"
}
},
"related_cves": [
{
"value": "CVE-2026-87863",
"evidence": "/aliases"
}
],
"security_relevant": true,
"severity_evidence": "/database_specific/severity"
},
"source_id": "core-osv",
"document_id": 444338,
"published_at": "2026-10-14T08:00:00+00:00"
}