NULL pointer dereference in Osrg Gobgp
CVE-2026-41642
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as "Well-known," the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.
EPSS: 0.005 (41.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Osrg Gobgp — versions 4.3.0, = 4.3.0
Weakness classification (CWE)
References
- security-advisories@github.com (Product, Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41642?
- CVE-2026-41642 is a high-severity vulnerability in Osrg Gobgp, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-05-07.
- How severe is CVE-2026-41642?
- High severity. CVSS v3 base score is 7.5 out of 10.