CVE-2026-41642High· 7.5▾ TwilightA flaw was found in GoBGP 4.3.0. A malformed BGP UPDATE with an unrecognized Path Attribute marked as well-known is not rejected cleanly, triggering a nil pointer dereference that crashes the GoBGP daemon. Fixed in GoBGP 4.4.0.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.5%
Last analysed / modified upstream
A flaw was found in GoBGP 4.3.0. A malformed BGP UPDATE with an unrecognized Path Attribute marked as well-known is not rejected cleanly, triggering a nil pointer dereference that crashes the GoBGP daemon. Fixed in GoBGP 4.4.0.
github.com/osrg/gobgp: GoBGP: Denial of Service via malformed BGP UPDATE message — rated Important by Red Hat. Released 2026-05-07, updated 2026-09-18.
Not affected:
Refer to the advisory for fix availability.
Affected packages:
github.com/osrg/gobgp/v4 >= 4.3.0, < 4.4.0Patched in:
github.com/osrg/gobgp/v4 4.4.0Connected by shared product, vendor, weakness, or advisory.
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