PyPIPackage

cbor2

4 known vulnerabilities (3 high, 1 medium), with the versions each affects and the releases that fix them.

Version timeline

CVE-2026-26209
Affects 1.0.0 to 5.8.0 (5.9.0 is outside it)
CVE-2025-68131
Affects 3.0.0 to 5.7.1 (5.8.0 is outside it)
CVE-2025-64076
Affects 1.0.0 to 5.7.0 (5.7.1 is outside it)
CVE-2024-26134
Affects 1.0.0 to 5.2.0 (5.2.0.post1 is outside it); 5.3.0 to 5.6.1 (5.6.2 is outside it)

Every release cve.now has on record, lowest version on the left; each bar is a run of versions an advisory affects.

CVE-2026-26209High 7.5
cbor2 has a Denial of Service via Uncontrolled Recursion in cbor2.loads
Affected: fixed in 5.9.0.
Fixed in 5.9.0 (released Mar 22, 2026, 1 day before disclosure).
The latest release, 6.2.1, is not affected.
CVE-2025-68131Medium 5.5
CBORDecoder reuse can leak shareable values across decode calls
Affected: from 3.0.0, fixed in 5.8.0.
Fixed in 5.8.0 (released Dec 30, 2025, 1 day before disclosure).
The latest release, 6.2.1, is not affected.
CVE-2025-64076High 7.5
Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the decode_definite_long_string() function of the C extension decoder…
Affected: fixed in 5.7.1.
Fixed in 5.7.1 (released Oct 24, 2025, 25 days before disclosure).
The latest release, 6.2.1, is not affected.
CVE-2024-26134High 7.5
CBOR2 decoder has potential buffer overflow
Affected: from 5.5.1, fixed in 5.6.2; from 5.5.1, fixed in 5.6.2.
Fixed in 5.6.2 (released Feb 19, 2024, the day of disclosure).
The latest release, 6.2.1, is not affected.