CVE-2026-19931
unknown
CVSS v3
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CVSS v4 NEW
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VIR risk
—
Description
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 4 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 8.22.0~rc2-1 |
| forky | Affected | — |
| bookworm | Affected | — |
Alpine Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| v3.24 | Fixed | 8.22.0-r0 |
| v3.23 | Fixed | 8.22.0-r0 |
References
- https://www.suse.com/security/cve/CVE-2026-19931.html
- https://security-tracker.debian.org/tracker/CVE-2026-19931
- https://security.alpinelinux.org/vuln/CVE-2026-19931
- https://pkgs.alpinelinux.org/packages?name=curl
- https://curl.se/docs/CVE-2026-19931.html
- https://curl.se/docs/CVE-2026-19931.json
- https://hackerone.com/reports/3923520
CWEs
CWE-488
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.