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Description
python-ecdsa has been found to be subject to a Minerva timing attack on the P-256 curve. Using the ecdsa.SigningKey.sign_digest() API function and timing signatures an attacker can leak the internal nonce which may allow for private key discovery. Both ECDSA signatures, key generation, and ECDH operations are affected. ECDSA signature verification is unaffected. The python-ecdsa project considers side channel attacks out of scope for the project and there is no planned fix.
Basic information
Type
reviewed
Severity
high Advisory on GitHub
Open advisory ↗ Repository advisory
Open repository advisory ↗ Source code
Browse source ↗ Published (advisory)
2024-01-22 21:35:27 UTC
Updated
2025-07-30 18:17:41 UTC
GitHub reviewed
2024-01-22 21:35:27 UTC
NVD published
2024-01-22
EPSS Score
Score
Percentile
0.62%
69.69%
CVSS Scores
Base score
Version
Severity
Vector
7.4
3.1
—
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
CWEs
CWE id
Name
CWE-203
Observable Discrepancy
CWE-208
Observable Timing Discrepancy
CWE-385
Covert Timing Channel
Credits
tomato42
(coordinator)
levpachmanov
(analyst)
Affected packages (1)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
pip
ecdsa >= 0
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cvelogic
Threat Intelligence