CVE-2026-41642: CWE-476: NULL Pointer Dereference in osrg gobgp
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.
AI Analysis
Technical Summary
CVE-2026-41642 is a vulnerability in GoBGP 4.3.0 where a malformed BGP UPDATE message with an unrecognized "Well-known" Path Attribute triggers a nil pointer dereference. This causes the GoBGP daemon to panic and crash, resulting in a remote Denial of Service. The vulnerability is classified under CWE-476 (NULL Pointer Dereference) and has a CVSS 3.1 base score of 7.5, indicating high severity. The flaw is fixed in version 4.4.0 of GoBGP.
Potential Impact
An unauthenticated remote attacker can send a specially crafted BGP UPDATE message to cause the GoBGP process to crash, resulting in a Denial of Service. There is no impact on confidentiality or integrity reported. The disruption affects availability of the BGP routing service running GoBGP 4.3.0.
Mitigation Recommendations
Upgrade GoBGP to version 4.4.0 or later where this NULL pointer dereference vulnerability has been patched. No other official remediation or temporary workaround is documented. Until upgraded, consider filtering or validating BGP UPDATE messages to block malformed packets with unrecognized "Well-known" Path Attributes if possible.
CVE-2026-41642: CWE-476: NULL Pointer Dereference in osrg gobgp
Description
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.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-41642 is a vulnerability in GoBGP 4.3.0 where a malformed BGP UPDATE message with an unrecognized "Well-known" Path Attribute triggers a nil pointer dereference. This causes the GoBGP daemon to panic and crash, resulting in a remote Denial of Service. The vulnerability is classified under CWE-476 (NULL Pointer Dereference) and has a CVSS 3.1 base score of 7.5, indicating high severity. The flaw is fixed in version 4.4.0 of GoBGP.
Potential Impact
An unauthenticated remote attacker can send a specially crafted BGP UPDATE message to cause the GoBGP process to crash, resulting in a Denial of Service. There is no impact on confidentiality or integrity reported. The disruption affects availability of the BGP routing service running GoBGP 4.3.0.
Mitigation Recommendations
Upgrade GoBGP to version 4.4.0 or later where this NULL pointer dereference vulnerability has been patched. No other official remediation or temporary workaround is documented. Until upgraded, consider filtering or validating BGP UPDATE messages to block malformed packets with unrecognized "Well-known" Path Attributes if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-21T23:58:43.801Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fc83f6cbff5d8610e90d4d
Added to database: 05/07/2026, 12:22:14 UTC
Last enriched: 05/07/2026, 12:36:42 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 99
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