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SCA: security update for ecdsa (GHSA-9f5j-8jwj-x28g)

medium Tenable Self-Hosted Container Security Plugin ID 439347

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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 truncated DER where the encoded length exceeds the available
 buffer. For example, an OCTET STRING that declares a length of 4096 bytes but provides only 3 bytes is
 parsed successfully instead of being rejected. Because of that, a crafted DER input can cause
 `SigningKey.from_der()` to raise an internal exception (`IndexError: index out of bounds on dimension 1`)
 rather than cleanly rejecting malformed DER (e.g., raising `UnexpectedDER` or `ValueError`). Applications
 that parse untrusted DER private keys may crash if they do not handle unexpected exceptions, resulting in
 a denial of service. Version 0.19.2 patches the issue. (CVE-2026-33936)

Solution

Update the ecdsa library and its related packages to version 0.19.2 or later.

See Also

https://github.com/advisories/GHSA-9f5j-8jwj-x28g

Plugin Details

Severity: Medium

ID: 439347

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 3/27/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-33936

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/27/2026

Vulnerability Publication Date: 3/27/2026

Reference Information

CVE: CVE-2026-33936