RHSA-2026:84721 - Security Advisory

Topic

An update for wireshark is now available for Red Hat Enterprise Linux 10.

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 wireshark packages contain a network protocol analyzer used to capture and browse the traffic running on a computer network.

Security Fix(es):

• wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash (CVE-2026-76886)
• wireshark: Wireshark: Denial of Service via RRC protocol dissector out-of-bounds write (CVE-2026-76880)
• wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector (CVE-2026-76919)
• wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash (CVE-2026-76879)
• wireshark: Wireshark: Denial of Service via X.509IF protocol dissector crash (CVE-2026-76928)
• wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector (CVE-2026-76927)
• wireshark: wireshark: Denial of Service via heap-based buffer overflow in SPDY dissector (CVE-2026-95387)
• wireshark: Heap-based Buffer Overflow in Wireshark (CVE-2026-95389)

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 10 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat CodeReady Linux Builder for x86_64 10 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 10 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 10 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 10 s390x
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 s390x

Fixes

• BZ - 2520079 - CVE-2026-76886 wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash
• BZ - 2520088 - CVE-2026-76880 wireshark: Wireshark: Denial of Service via RRC protocol dissector out-of-bounds write
• BZ - 2520093 - CVE-2026-76919 wireshark: Wireshark: Denial of Service vulnerability in ESS protocol dissector
• BZ - 2520098 - CVE-2026-76879 wireshark: Wireshark: Denial of Service via C12.22 protocol dissector crash
• BZ - 2520100 - CVE-2026-76928 wireshark: Wireshark: Denial of Service via X.509IF protocol dissector crash
• BZ - 2520103 - CVE-2026-76927 wireshark: Wireshark: Denial of Service vulnerability in H.245 protocol dissector
• BZ - 2543033 - CVE-2026-95387 wireshark: wireshark: Denial of Service via heap-based buffer overflow in SPDY dissector
• BZ - 2543037 - CVE-2026-95389 wireshark: Heap-based Buffer Overflow in Wireshark

CVEs

• CVE-2026-76879
• CVE-2026-76880
• CVE-2026-76886
• CVE-2026-76919
• CVE-2026-76927
• CVE-2026-76928
• CVE-2026-95387
• CVE-2026-95389

References

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