RHSA-2026:72506 - Security Advisory

Topic

An update for curl is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.

Security Fix(es):

• curl: libcurl: Improper certificate validation due to cached TLS settings reuse (CVE-2025-14819)
• curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)
• curl: curl: Unauthorized access due to improper HTTP proxy connection reuse (CVE-2026-3784)
• curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)
• curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)
• libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse (CVE-2026-8932)
• curl: curl: Information disclosure via incorrect .netrc password lookup (CVE-2026-8926)
• curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)
• curl: libcurl: Unauthorized connection reuse due to a logical error (CVE-2026-8458)
• curl: curl: Cookie injection via malicious HTTP server using super cookies (CVE-2026-8924)
• curl: curl: Information disclosure via incorrect Digest authentication header reuse (CVE-2026-11856)
• curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP (CVE-2026-12064)
• curl: Information disclosure due to uncleared proxy authentication state (CVE-2026-8927)
• libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials (CVE-2026-9079)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2426408 - CVE-2025-14819 curl: libcurl: Improper certificate validation due to cached TLS settings reuse
• BZ - 2446448 - CVE-2026-1965 curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication
• BZ - 2446449 - CVE-2026-3784 curl: curl: Unauthorized access due to improper HTTP proxy connection reuse
• BZ - 2446450 - CVE-2026-3783 curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect
• BZ - 2496758 - CVE-2026-9547 curl: curl: Man-in-the-middle attack via SSH host key bypass
• BZ - 2496759 - CVE-2026-8932 libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse
• BZ - 2496760 - CVE-2026-8926 curl: curl: Information disclosure via incorrect .netrc password lookup
• BZ - 2496763 - CVE-2026-8286 curl: curl: Insecure connection establishment due to TLS configuration mismatch
• BZ - 2496764 - CVE-2026-8458 curl: libcurl: Unauthorized connection reuse due to a logical error
• BZ - 2496765 - CVE-2026-8924 curl: curl: Cookie injection via malicious HTTP server using super cookies
• BZ - 2496767 - CVE-2026-11856 curl: curl: Information disclosure via incorrect Digest authentication header reuse
• BZ - 2496768 - CVE-2026-12064 curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP
• BZ - 2496769 - CVE-2026-8927 curl: Information disclosure due to uncleared proxy authentication state
• BZ - 2496771 - CVE-2026-9079 libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials

CVEs

• CVE-2025-14819
• CVE-2026-1965
• CVE-2026-3783
• CVE-2026-3784
• CVE-2026-8286
• CVE-2026-8458
• CVE-2026-8924
• CVE-2026-8926
• CVE-2026-8927
• CVE-2026-8932
• CVE-2026-9079
• CVE-2026-9547
• CVE-2026-11856
• CVE-2026-12064

References

• https://access.redhat.com/security/updates/classification/#important