CVE-2023-27537
mediumA double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles".
Vendor / product: Haxx — libcurl
A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.
CVSS
5.9
5.9 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2023-03-30 20:15
Modified: 2026-11-02 23:17
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-11-03 07:33 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
haxx / libcurl 7.88.0, 7.88.1
netapp / active_iq_unified_manager all versions
netapp / clustered_data_ontap 9.0
broadcom / brocade_fabric_operating_system_firmware all versions
netapp / h300s_firmware all versions
netapp / h500s_firmware all versions
netapp / h700s_firmware all versions
netapp / h410s_firmware all versions
splunk / universal_forwarder ≥8.2.0 <8.2.12, ≥9.0.0 <9.0.6, 9.1.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://hackerone.com/reports/1897203 support@hackerone.com
- https://security.gentoo.org/glsa/202310-12 support@hackerone.com
- https://security.netapp.com/advisory/ntap-20230420-0010/ support@hackerone.com
- https://hackerone.com/reports/1897203 af854a3a-2127-422b-91ae-364da2661108
- https://security.gentoo.org/glsa/202310-12 af854a3a-2127-422b-91ae-364da2661108
- https://security.netapp.com/advisory/ntap-20230420-0010/ af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- https://cert-portal.siemens.com/productcert/html/ssa-943925.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:33 UTC · record ↗