CVE catalog
CVE-2023-27537
curl: CVE-2023-27537
- Severity
- Medium · CVSS 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.90% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | curl | sid | 8.23.0-1 | fixed |
| Debian | curl | forky | 8.22.0-1 | fixed |
| Debian | curl | trixie | 8.14.1-2+deb13u5 | fixed |
| Debian | curl | trixie-security | 8.14.1-2+deb13u7 | fixed |
| Debian | curl | bookworm | 7.88.1-10+deb12u15 | fixed |
| Debian | curl | bookworm-security | 7.88.1-10+deb12u5 | fixed |
| Cpe | libcurl | Not reported | Not reported | unknown |
| Cpe | active_iq_unified_manager | Not reported | Not reported | unknown |
| Cpe | clustered_data_ontap | Not reported | Not reported | unknown |
| Cpe | brocade_fabric_operating_system_firmware | Not reported | Not reported | unknown |
| Cpe | h300s_firmware | Not reported | Not reported | unknown |
| Cpe | h500s_firmware | Not reported | Not reported | unknown |
| Cpe | h700s_firmware | Not reported | Not reported | unknown |
| Cpe | h410s_firmware | Not reported | Not reported | unknown |
| Cpe | universal_forwarder | Not reported | Not reported | unknown |
| Alpine | curl | 3.14 | 8.0.1-r0 | fixed |
| Alpine | curl | 3.15 | 8.0.1-r0 | fixed |
| Alpine | curl | 3.16 | 8.0.1-r0 | fixed |
| Alpine | curl | 3.17 | 7.88.1-r1 | fixed |
| Alpine | curl | 3.18 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.19 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.20 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.21 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.22 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.23 | 8.0.0-r0 | fixed |
| Alpine | curl | 3.24 | 8.0.0-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | curl | source | sid | 7.88.1-7 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | forky | 7.88.1-7 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | trixie | 7.88.1-7 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | bookworm | 7.88.1-7 | not yet assigned | Not reported | Not reported |
| Alpine | curl | apk | 3.14 | 8.0.1-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.15 | 8.0.1-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.16 | 8.0.1-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.17 | 7.88.1-r1 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.18 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.19 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.20 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.21 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.22 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.23 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
| Alpine | curl | apk | 3.24 | 8.0.0-r0 | Not reported | ALPINE-CVE-2023-27537 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-943925.json]
- [https://cert-portal.siemens.com/productcert/html/ssa-398330.html]
- [https://cert-portal.siemens.com/productcert/html/ssa-943925.html]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2024_12812-1.json]
- [https://hackerone.com/reports/1897203]
- [https://nvd.nist.gov/vuln/detail/CVE-2023-27537]
- [https://osv.dev/vulnerability/ALPINE-CVE-2023-27537]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-27537]
- [https://security-tracker.debian.org/tracker/CVE-2023-27537]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-27537.json]
- [https://security.gentoo.org/glsa/202310-12]
- [https://security.netapp.com/advisory/ntap-20230420-0010/]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-1350.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]