v3.26.1
Cover
 12 Months Ended
Dec. 31, 2025
shares
Entity Addresses [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-40377
Entity Registrant Name Valneva SE
Entity Incorporation, State or Country Code I0
Entity Address, Address Line One Îlot Saint-Joseph, Bureaux Convergence, Bât. A, 12 ter Quai Perrache
Entity Address, Postal Zip Code 69002
Entity Address, City or Town Lyon
Entity Address, Country FR
Entity Common Stock, Shares Outstanding (in shares) 173,539,745
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001836564
Amendment Flag false
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
American Depositary Shares, each representing two ordinary shares, €0.15 nominal value per share  
Entity Addresses [Line Items]  
Title of each class American Depositary Shares, each representing two ordinary shares, €0.15 nominal value per share
Trading Symbol(s) VALN
Name of each exchange on which registered NASDAQ
Ordinary shares, €0.15 nominal value per share  
Entity Addresses [Line Items]  
Title of each class Ordinary shares, €0.15 nominal value per share
Business contact  
Entity Addresses [Line Items]  
Entity Address, Address Line One Îlot Saint-Joseph, Bureaux Convergence, Bât. A, 12 ter Quai Perrache
Entity Address, Postal Zip Code 69002
Entity Address, City or Town Lyon
Entity Address, Country FR
Contact Personnel Name Thomas Lingelbach
Country Region +33
City Area Code 2
Local Phone Number 28 07 37 10