What is CVE-2026-33753?

CVE-2026-33753 is a medium-severity vulnerability in Trailofbits Rfc3161-client, classified under Improper Certificate Validation. CVSS score: 6.2/10. Published 2026-04-08.

How severe is CVE-2026-33753?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Trailofbits Rfc3161-client

CVE-2026-33753

rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to 1.0.6, an Authorization Bypass vulnerability in rfc3161-client's signature verification allows any attacker to impersonate a trus…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (1.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Trailofbits Rfc3161-client — versions < 1.0.6

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-3xxc-pwj6-jgrj (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33753?: CVE-2026-33753 is a medium-severity vulnerability in Trailofbits Rfc3161-client, classified under Improper Certificate Validation. CVSS score: 6.2/10. Published 2026-04-08.
How severe is CVE-2026-33753?: Medium severity. CVSS v3 base score is 6.2 out of 10.