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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-11856

41
FAUCET Score

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

First published: Jul 3, 2026Last modified: Jul 3, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.10.6, < 8.21.0CPE matchmatch criteria
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
>= 7.10.6, <= 7.10.6CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.10.7, <= 7.10.7CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.10.8, <= 7.10.8CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*
>= 7.11.0, <= 7.11.0CPE match
cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 26th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-11856Moderate

cross-origin Digest auth state leak

Jul 2, 2026

References

curl.se / docs/CVE-2026-11856.html
PatchVendor Advisory
curl.se / docs/CVE-2026-11856.json
Vendor Advisory
hackerone.com / reports/3793260
ExploitIssue TrackingThird Party Advisory