CVE catalog
CVE-2026-9546
A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cleared. While the documentation states that passing NULL to `CURLOPT_REFERER` suppresses the header, the o
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.65% · Oct 25, 2026
A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cleared. While the documentation states that passing NULL to `CURLOPT_REFERER` suppresses the header, the option failed to clear the internal state. As a result, the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.
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 | not affected |
| Debian | curl | trixie-security | 8.14.1-2+deb13u7 | not affected |
| Debian | curl | bookworm | 7.88.1-10+deb12u15 | not affected |
| Debian | curl | bookworm-security | 7.88.1-10+deb12u5 | not affected |
| Cpe | curl | Not reported | 8.21.0 | fixed |
| Cpe | curl | Not reported | Not reported | not affected |
| Cpe | curl | Not reported | 8.21.0 | fixed |
| Alpine | curl | 3.23 | 8.22.0-r0 | fixed |
| Alpine | curl | 3.24 | 8.21.0-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | curl | source | sid | 8.21.0~rc2-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | forky | 8.21.0~rc2-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | curl | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.21.0 | Not reported | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.21.0 | Not reported | NVD-CVE-2026-9546 | Not reported |
| Alpine | curl | apk | 3.23 | 8.22.0-r0 | Not reported | ALPINE-CVE-2026-9546 | Not reported |
| Alpine | curl | apk | 3.24 | 8.21.0-r0 | Not reported | ALPINE-CVE-2026-9546 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [curl]Not affected
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl3-gnutls]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl3-nss]Not affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-doc]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· all · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· all · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-gnutls-dev]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-nss-dev]Not affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-openssl-dev]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11230-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-9546]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-9546]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-9546]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-9546]
- [https://security-tracker.debian.org/tracker/CVE-2026-9546]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9546.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2052.json]
[CERT-Bund public 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]