CVE-2026-26209Medium· 5.5▾ SunlitA flaw was found in cbor2, a library for encoding and decoding Concise Binary Object Representation (CBOR) data. A remote attacker can exploit this vulnerability by sending a specially crafted CBOR payload containing deeply nested structur…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.4%
Last analysed / modified upstream
7.5 → 5.5
high → medium
0.4% → 0.7%
A flaw was found in cbor2, a library for encoding and decoding Concise Binary Object Representation (CBOR) data. A remote attacker can exploit this vulnerability by sending a specially crafted CBOR payload containing deeply nested structures. This can cause the application to crash due to uncontrolled recursion, leading to a complete Denial of Service (DoS) for the affected application.
cbor2: cbor2: Denial of Service due to uncontrolled recursion via crafted CBOR payloads — rated Moderate by Red Hat. Released 2026-03-23, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
For more information visit https://access.redhat.com/errata/RHSA-2026:19724 https://access.redhat.com/errata/RHSA-2026:19724 For more information visit https://access.redhat.com/errata/RHSA-2026:19725 https://access.redhat.com/errata/RHSA-2026:19725 For more information visit https://access.redhat.com/errata/RHSA-2026:16030 https://access.redhat.com/errata/RHSA-2026:16030
Affected packages:
cbor2 < 5.9.0Patched in:
cbor2 5.9.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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