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Vulnerability record · CVE-2024-26134 · published 19 February 2024

CVE-2024-26134: Agronholm cbor2 classic buffer overflow vulnerability

AAgronholm · Cbor2

cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.

7.5 CVSS 3.1 High EPSS 1.2% · top 33.6% CWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/agronholm/cbor2/commit/387755eacf0be35591a478d3c67fe10618a6d542 Product
https://github.com/agronholm/cbor2/commit/4de6991ba29bf2290d7b9d83525eda7d021873df Patch
https://github.com/agronholm/cbor2/pull/204 Issue Tracking
https://github.com/agronholm/cbor2/releases/tag/5.6.2 Release Notes
https://github.com/agronholm/cbor2/security/advisories/GHSA-375g-39jq-vq7m ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/BT42VXZMMMCSSHMA65KKPOZCX Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/GX524ZG2XJWFV37UQKQ4LWIH4 Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/PWC3VU6YV6EXKCSX5GTKWLBZI Mailing List
https://github.com/agronholm/cbor2/commit/387755eacf0be35591a478d3c67fe10618a6d542 Product
https://github.com/agronholm/cbor2/commit/4de6991ba29bf2290d7b9d83525eda7d021873df Patch
https://github.com/agronholm/cbor2/pull/204 Issue Tracking
https://github.com/agronholm/cbor2/releases/tag/5.6.2 Release Notes
https://github.com/agronholm/cbor2/security/advisories/GHSA-375g-39jq-vq7m ExploitVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/BT42VXZMMMCSSHMA65KKPOZCX Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/GX524ZG2XJWFV37UQKQ4LWIH4 Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/PWC3VU6YV6EXKCSX5GTKWLBZI Mailing List

Track CVE-2024-26134 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-26134), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.