SB2026100647 - Fedora 44 update for curl

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026100647

SB2026100647 - Fedora 44 update for curl

Published: October 6, 2026

Security Bulletin ID SB2026100647
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Insertion of Sensitive Information Into Sent Data (CVE-ID: CVE-2026-80255)

CWE-ID: CWE-201 - Insertion of Sensitive Information Into Sent Data

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper cookie attribute handling in the Set-Cookie header processing logic when parsing a Set-Cookie header that uses a tab immediately before the Secure attribute. A remote attacker can send a specially crafted Set-Cookie header to disclose sensitive information.

The issue can cause a cookie to be stored without its Secure flag and then be sent over plaintext HTTP on subsequent requests to the same host.


2) Use-after-free (CVE-ID: CVE-2026-80229)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to use-after-free in libcurl multi interface connection reuse handling when performing transfers over pooled TLS connections with OpenSSL 3 providers. A remote user can trigger premature easy handle destruction during connection reuse to cause a denial of service.

This affects libcurl built with OpenSSL 3+ provider configurations and also impacts the curl command line tool.


3) Use-after-free (CVE-ID: CVE-2026-18924)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to trigger a use-after-free.

The vulnerability exists due to use-after-free in libcurl HTTP/2 server push stream handling when processing an HTTPS HTTP/2 server push on a shared connection. A remote attacker can send a server push response sequence to trigger a use-after-free.

The issue affects libcurl only and requires HTTP/2 server push to be enabled and accepted by the application, along with connection sharing.


Remediation

Install update from vendor's website.

References