Vulnérabilité · NVD
CVE-2025-12781
CVE-2025-12781, sévérité medium (CVSS 5.3) : 3 apps suivies concernées, toutes corrigées ou à statut indéterminable en version courante.
- Gravité (CVSS)
- 5.3
- Exploitation
- 0.6 %
- Apps suivies
- 3
- Encore exposées
- 0
Échelle NVD
EPSS, prédiction à 30 jours
EN
When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues.
This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet.
The attached patches DOES NOT make the base64-decode behavior raise an error, as this would be a change in behavior and break existing programs. Instead, the patch deprecates the behavior which will be replaced with the newly recommended behavior in a future version of Python. Users are recommended to mitigate by verifying user-controlled inputs match the base64
alphabet they are expecting or verify that their application would not be
affected if the b64decode() functions accepted "+" or "/" outside of altchars.
Voir le vecteur CVSS brut
Apps suivies liées à cette CVE
Pour chaque app : la plage affectée, la version qui corrige, et où en est l'app suivie aujourd'hui.
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Builds affectées observées (1)
Configurations CPE vulnérables (3)
| Vendor | Produit | Plateforme | Versions | CPE 2.3 URI |
|---|---|---|---|---|
| python |
python Toutes plateformes (wildcard)
|
Toutes plateformes (wildcard) | <3.13.10 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python |
python Toutes plateformes (wildcard)
|
Toutes plateformes (wildcard) | ≥3.14.0 <3.14.1 | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
| python |
python Toutes plateformes (wildcard)
|
Toutes plateformes (wildcard) | - | cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:* |