========================================================================== Ubuntu Security Notice USN-8348-1 June 03, 2026
gobgp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in GoBGP.
Software Description:
- gobgp: BGP implementation in Go
Details:
It was discovered that GoBGP incorrectly handled certain specially crafted
BGP UPDATE messages. A remote attacker could possibly use this issue to
cause GoBGP to crash, resulting in a denial of service. (CVE-2026-37461)
Yanlei Wang discovered that GoBGP incorrectly handled certain malformed BGP
UPDATE messages containing 4-byte AS attributes. A remote attacker could
possibly use this issue to cause GoBGP to crash, resulting in a denial of
service. (CVE-2026-41643)
It was discovered that GoBGP incorrectly handled certain malformed BGP
UPDATE messages containing SRv6 L3 Service attributes. A remote attacker
could possibly use this issue to cause GoBGP to crash, resulting in a
denial of service. (CVE-2026-7734)
It was discovered that GoBGP incorrectly handled certain malformed BGP
UPDATE messages containing Accumulated IGP (AIGP) attributes. A remote
attacker could possibly use this issue to cause GoBGP to crash, resulting
in a denial of service. (CVE-2026-7735)
It was discovered that GoBGP incorrectly handled certain malformed Multi-
threaded Routing Toolkit (MRT) routing information entries. A remote
attacker could possibly use this issue to cause GoBGP to crash, resulting
in a denial of service. (CVE-2026-7736)
It was discovered that GoBGP incorrectly handled certain malformed Multi-
threaded Routing Toolkit (MRT) headers. A remote attacker could possibly
use this issue to cause GoBGP to crash, resulting in a denial of service.
(CVE-2026-7737)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
gobgpd 3.36.0-2ubuntu0.1~esm1
Available with Ubuntu Pro
Ubuntu 24.04 LTS
gobgpd 3.23.0-1ubuntu0.3+esm4
Available with Ubuntu Pro
Ubuntu 22.04 LTS
gobgpd 2.25.0-3ubuntu0.1+esm4
Available with Ubuntu Pro
Ubuntu 20.04 LTS
gobgpd 2.12.0-1ubuntu0.1~esm3
Available with Ubuntu Pro
Ubuntu 18.04 LTS
gobgpd 1.29-1ubuntu0.1+esm2
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8348-1
CVE-2026-37461, CVE-2026-41643, CVE-2026-7734, CVE-2026-7735,
CVE-2026-7736, CVE-2026-7737
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