| Name | CVE-2026-8927 |
| Description | When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | bullseye | 7.74.0-1.3+deb11u13 | vulnerable |
| bullseye (security) | 7.74.0-1.3+deb11u16 | vulnerable |
| bookworm | 7.88.1-10+deb12u15 | vulnerable |
| bookworm (security) | 7.88.1-10+deb12u5 | vulnerable |
| trixie | 8.14.1-2+deb13u4 | vulnerable |
| forky | 8.20.0-5 | vulnerable |
| sid | 8.21.0-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | (unstable) | 8.21.0~rc2-1 | | | |
Notes
[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <postponed> (Minor issue; libcurl env-proxy Digest auth handle reuse)
[bullseye] - curl <postponed> (Minor issue; libcurl env-proxy Digest auth handle reuse)
https://curl.se/docs/CVE-2026-8927.html
Introduced with: https://github.com/curl/curl/commit/fc6eff13b5414caf6edf22d73a3239e074a04216 (curl-7_12_0)
Fixed by: https://github.com/curl/curl/commit/5c225384b8d52c67ce8259c6e4203bc57aacb567 (rc-8_21_0-1, curl-8_21_0)