CURL-CVE-2026-87863

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Source
https://curl.se/docs/CVE-2026-87863.html
Import Source
https://curl.se/docs/CURL-CVE-2026-87863.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-87863
Aliases
  • CVE-2026-87863
Published
2026-10-14T08:00:00Z
Modified
2026-10-14T19:02:56Z
Summary
HSTS response erases persisted entries
Details

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.

Database specific 
{
    "CWE":  {
        "desc":  "Information Exposure Through Sent Data",
        "id":  "CWE-201"
    },
    "URL":  "https://curl.se/docs/CVE-2026-87863.json",
    "affects":  "both",
    "issue":  "https://hackerone.com/reports/3972373",
    "last_affected":  "8.22.0",
    "package":  "curl",
    "severity":  "Low",
    "www":  "https://curl.se/docs/CVE-2026-87863.html"
}
Credits
    • Stanislav Fort (Aisle Research) - FINDER
    • Daniel Stenberg - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

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
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
0c667188e0c6cda615a036b8a2b4125f2c404dde
Fixed
08d50a791b3197a3d0a4fc2f778e243f5501c67e

Affected versions

8.*
8.10.0
8.10.1
8.11.0
8.11.1
8.12.0
8.12.1
8.13.0
8.14.0
8.14.1
8.15.0
8.16.0
8.17.0
8.18.0
8.19.0
8.2.0
8.2.1
8.20.0
8.21.0
8.22.0
8.3.0
8.4.0
8.5.0
8.6.0
8.7.0
8.7.1
8.8.0
8.9.0
8.9.1
Other
curl-8_10_0
curl-8_10_1
curl-8_11_0
curl-8_11_1
curl-8_12_0
curl-8_12_1
curl-8_13_0
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_20_0
curl-8_21_0
curl-8_22_0
curl-8_2_0
curl-8_2_1
curl-8_3_0
curl-8_4_0
curl-8_5_0
curl-8_6_0
curl-8_7_0
curl-8_7_1
curl-8_8_0
curl-8_9_0
curl-8_9_1
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
rc-8_21_0-3
rc-8_22_0-1
rc-8_22_0-2
rc-8_22_0-3
tiny-curl-8_4_0

Database specific

source 
"https://curl.se/docs/CURL-CVE-2026-87863.json"
vanir_signatures 
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        "deprecated":  false,
        "digest":  {
            "function_hash":  "130716959620459958849575900228284574811",
            "length":  1254
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        "id":  "CURL-CVE-2026-87863-0af9106b",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/curl/curl.git/commit/08d50a791b3197a3d0a4fc2f778e243f5501c67e",
        "target":  {
            "file":  "lib/hsts.c",
            "function":  "Curl_hsts_save"
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        "target":  {
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            "function":  "Curl_hsts_parse"
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]
vanir_signatures_modified 
"2026-10-14T19:02:56Z"