Vulnerability in Curl Affects Cookie Security
CVE-2026-80255

7.5HIGH

Key Information:

Vendor

Curl

Status
Vendor
CVE Published:
6 September 2026

What is CVE-2026-80255?

A vulnerability in Curl arises from a malformed Set-Cookie: header that uses a tab character instead of a space before the Secure attribute. This improper formatting allows Curl to store the cookie without the Secure flag set, which can lead to sensitive information being transmitted over unencrypted HTTP connections in later requests to the same domain. This poses significant risks as sensitive data may be intercepted by malicious actors targeting unprotected transmissions.

Affected Version(s)

curl 8.13.0 < 8.14.2

curl 8.15.0 < 8.16.1

curl 8.17.0 < 8.20.1

References

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Stanislav Fort (Aisle Research)
Daniel Stenberg
.