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High RLSA-2026:92368 5 CVEs

Important: curl security, bug fix, and enhancement update

Published Oct 30, 2026 · Updated Oct 30, 2026

Ecosystem: Rocky Linux

Summary

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):

* libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse (CVE-2026-8932)

* 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: Information disclosure due to uncleared proxy authentication state (CVE-2026-8927)

Bug Fix(es) and Enhancement(s):

* Backport upstream curl PR #6852 ("h2: allow 100 streams by default") to Rocky Linux 8 libcurl (JIRA:Rocky Linux-232829)

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.

Fixed packages 1

ReleasePackageFixed in
Rocky Linux · 8 curl 0:7.61.1-34.el8_10.18

Vulnerabilities 5

  • Critical 9.8
    CVE-2026-11856

    cross-origin Digest auth state leak

    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 `Authori…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine
  • Critical 9.1
    CVE-2026-8924

    trailing dot domain super cookie

    A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set "super cookies" that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-p…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine
  • Critical 9.1
    CVE-2026-8927

    env-set cross-proxy Digest auth state leak

    When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Diges…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine
  • High 7.5
    CVE-2026-8932 Public exploit

    incomplete mTLS config matching in conn reuse

    libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them m…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine
  • Medium 6.5
    CVE-2026-8458

    wrong reuse for different services

    libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing c…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496759
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496764
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496765
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496767
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496769
  • advisory
    https://access.redhat.com/errata/RHSA-2026:92368