CVE-2026-33936: The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for

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MEDIUM 5.3REMOTEUPGRADE

CVE-2026-33936 is a medium-severity flaw (CVSS 5.3) affecting ecdsa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Prior to version 0.19.2, an issue in the low-level DER parsing functions can cause unexpected exceptions to be raised from the public API functions. `ecdsa.der.remove_octet_string()` accepts trun

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-20, CWE-130
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: tlsfuzzer

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 23:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

tlsfuzzer ecdsa UPGRADE

Affected: < 0.19.2

Fixed in: 0.19.2

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show ecdsa

2. UPGRADE to 0.19.2

pip install --upgrade "ecdsa>=0.19.2"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33936?

ecdsa: upgrade to 0.19.2. Exact commands for each OS are on this page.

Is CVE-2026-33936 being exploited?

CVE-2026-33936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33936 affect?

CVE-2026-33936 affects ecdsa. Severity is medium (CVSS 5.3). The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Di

How urgent is CVE-2026-33936?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities · PyPI packages vulnerabilities

References

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