CVE-2026-41643: CWE-129: Improper Validation of Array Index in osrg gobgp
CVE-2026-41643 is a high-severity vulnerability in GoBGP versions prior to 4. 3. 0. It involves improper validation of array indexes during the processing of malformed BGP UPDATE messages containing 4-byte AS attributes. This flaw can cause a runtime 'index out of range' panic, resulting in a remote Denial of Service (DoS). The issue has been fixed in GoBGP version 4. 3. 0.
AI Analysis
Technical Summary
GoBGP, an open source BGP implementation written in Go, contains a vulnerability identified as CVE-2026-41643 (CWE-129) affecting versions before 4.3.0. When processing malformed BGP UPDATE messages with 4-byte AS attributes, the software improperly validates array indexes, leading to an internal slice index shift that triggers a runtime panic (index out of range). This causes the affected GoBGP instance to crash, enabling a remote attacker to cause a Denial of Service. The vulnerability is addressed by an official patch in version 4.3.0.
Potential Impact
The vulnerability allows remote attackers to cause a Denial of Service by sending specially crafted BGP UPDATE messages that trigger a runtime panic in GoBGP. This results in service disruption but does not affect confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Upgrade GoBGP to version 4.3.0 or later, where this vulnerability has been patched. Since the vendor advisory confirms the fix in 4.3.0, applying this official update is the recommended remediation. No additional mitigation steps are indicated.
CVE-2026-41643: CWE-129: Improper Validation of Array Index in osrg gobgp
Description
CVE-2026-41643 is a high-severity vulnerability in GoBGP versions prior to 4. 3. 0. It involves improper validation of array indexes during the processing of malformed BGP UPDATE messages containing 4-byte AS attributes. This flaw can cause a runtime 'index out of range' panic, resulting in a remote Denial of Service (DoS). The issue has been fixed in GoBGP version 4. 3. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GoBGP, an open source BGP implementation written in Go, contains a vulnerability identified as CVE-2026-41643 (CWE-129) affecting versions before 4.3.0. When processing malformed BGP UPDATE messages with 4-byte AS attributes, the software improperly validates array indexes, leading to an internal slice index shift that triggers a runtime panic (index out of range). This causes the affected GoBGP instance to crash, enabling a remote attacker to cause a Denial of Service. The vulnerability is addressed by an official patch in version 4.3.0.
Potential Impact
The vulnerability allows remote attackers to cause a Denial of Service by sending specially crafted BGP UPDATE messages that trigger a runtime panic in GoBGP. This results in service disruption but does not affect confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Upgrade GoBGP to version 4.3.0 or later, where this vulnerability has been patched. Since the vendor advisory confirms the fix in 4.3.0, applying this official update is the recommended remediation. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-21T23:58:43.802Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fc83f6cbff5d8610e90d51
Added to database: 5/7/2026, 12:22:14 PM
Last enriched: 5/7/2026, 12:36:37 PM
Last updated: 5/7/2026, 1:27:23 PM
Views: 4
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