Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2025-22866

Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec

Answer in brief

CVE-2025-22866 records a Unknown severity vulnerability in Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec. The current sources do not mark it as known exploited. The current feed maps stdlib (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 6, 2025Updated Sep 14, 2026Source checked Sep 14, 2026First seen by HOL Aug 18, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps stdlib (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
stdlibgo	>=0 <1.22.12 >=1.23.0-0 <1.23.6 >=1.24.0-0 <1.24.0-rc.3	1.22.12, 1.23.6, 1.24.0-rc.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for stdlib.
Review the reported fix. Update stdlib to 1.22.12 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Feb 6, 2025
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Aug 18, 2026

Sources and claim methodology

Upstream source description

Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Due to the way this function is used, we do not believe this leakage is enough to allow recovery of the private key when P-256 is used in any well known protocols.

Quoted source text, attributed separately from HOL analysis.