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CVE-2026-33936

21
FAUCET Score

CVE-2026-33936 is a Denial of Service vulnerability in the `ecdsa` PyPI package, affecting versions prior to 0.19.2, where malformed DER inputs can trigger unexpected exceptions during private key parsing. This medium-severity vulnerability (CVSS 5.3) allows an unauthenticated attacker to cause a crash in applications that process untrusted DER private keys, leading to a Denial of Service. There is no evidence of active exploitation, public exploit code, or significant community discussion regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.19.2CPE matchmatch criteria
cpe:2.3:a:tlsfuzzer:ecdsa:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.48%
Probability of exploitation in next 30 days
EPSS Percentile
38.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0048 is in the 24th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 19941-17084Fixed in: 0.19.2-1
microsoftpatch availablevia msrc
Product: azl3 python-ecdsa 0.18.0-2 on Azure Linux 3.0Fixed in: 0.19.2-1
pippatch availablevia ghsa
Product: ecdsaFixed in: 0.19.2

Vendor Advisories (2)

pipGHSA-9f5j-8jwj-x28gmedium

python-ecdsa: Denial of Service via improper DER length validation in crafted private keys

Mar 27, 2026
microsoft2026-Mar/CVE-2026-33936Moderate

python-ecdsa: Denial of Service via improper DER length validation in crafted private keys

Mar 10, 2026

References

github.com / tlsfuzzer/python-ecdsa/commit/bd66899550d7185939bf27b75713a2ac9325a9d3
Patch
github.com / tlsfuzzer/python-ecdsa/releases/tag/python-ecdsa-0.19.2
ProductRelease Notes
github.com / tlsfuzzer/python-ecdsa/security/advisories/GHSA-9f5j-8jwj-x28g
ExploitMitigationVendor Advisory