> CVE-2026-53720 [MEDIUM]

« BACK_TO_HOME
PUBLISHED
2026-09-03 16:17
MODIFIED
2026-09-03 16:17
CVSS_SCORE V3
5.1
EPSS (Prob. Exploit)
0.18%
Top 93.0%
DATA SOURCES:
NVD đź”— 2026-09-03 CWE MITRE đź”— 2026-10-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-10-29 OSV đź”— 2026-09-09

> DESCRIPTION

pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i_32 implementation does not check the nb_blocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i_32 will write past the end of the buffer and possibly corrupt the heap. This issue has been patched in version 4.0.2.8.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Local (L)
Exploit nécessite un accès local au système
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
Low (L)
Interruption partielle du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
Low
Interruption partielle du service possible

> WEAKNESSES

CWE-122 CWE-787 CWE-1284

> CWE DETAILED DESCRIPTIONS

CWE-122: Heap-based Buffer Overflow - A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). | CWE-787: Out-of-bounds Write - The product writes data past the end, or before the beginning, of the intended buffer. | CWE-1284: Improper Validation of Specified Quantity in Input - The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

> GITHUB SECURITY ADVISORY

GHSA-8f95-v3jq-cj86 MODERATE

pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buffer is too small

AFFECTED PACKAGES:
PIP / pymonocypher
< 4.0.2.8
Fixed in: 4.0.2.8

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buffer is too small

AFFECTED PACKAGES:
Unknown / Unknown
12 versions affected
ALIASES:
GHSA-8f95-v3jq-cj86, PYSEC-2026-3000

> HISTORIQUE DES MODIFICATIONS

Première apparition
03/09/2026 16:17
Source: NVD
đź“Š ENRICHISSEMENT 01/10/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-122: Heap-based Buffer Overflow - A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the bu...
Total des modifications: 1 Dernière mise à jour: 4 weeks ago

> REFERENCES

https://github.com/jetperch/pymonocypher/commit/90ff5b13b13b5673c372e188f482d8c1...
https://github.com/jetperch/pymonocypher/releases/tag/v4.0.2.8
https://github.com/jetperch/pymonocypher/security/advisories/GHSA-8f95-v3jq-cj86
« BACK_TO_HOME