osrg GoBGP up to 4.3.0 pkg/packet/mrt/mrt.go parseRibEntry integer underflow

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in osrg GoBGP up to 4.3.0. It has been classified as critical. Affected by this issue is the function parseRibEntry of the file pkg/packet/mrt/mrt.go. The manipulation leads to integer underflow. This vulnerability is documented as CVE-2026-7736. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in osrg GoBGP up to 4.3.0. This issue affects the function parseRibEntry of the file pkg/packet/mrt/mrt.go. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-7736. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 4.4.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 76d911046344a3923cbe573364197aa081944592 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer underflow
CWE: CWE-191 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: GoBGP 4.4.0
Patch: 76d911046344a3923cbe573364197aa081944592

Timelineinfo

05/03/2026 Advisory disclosed
05/03/2026 +0 days VulDB entry created
05/03/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 76d911046344a3923cbe573364197aa081944592
Status: Confirmed

CVE: CVE-2026-7736 (🔒)
GCVE (CVE): GCVE-0-2026-7736
GCVE (VulDB): GCVE-100-360911

Entryinfo

Created: 05/03/2026 18:21
Changes: 05/03/2026 18:21 (57)
Complete: 🔍
Submitter: Sunxj
Cache ID: 216::103

Submitinfo

Accepted

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