[UPDATE] [low] CPython: Vulnerability allows unspecified attack
An attacker can exploit a vulnerability in CPython regarding Base64 data to conduct an unspecified attack.
CSIRTS triage
- What
- A vulnerability allows an attacker to conduct an unspecified attack regarding Base64 data.
- Who is affected
- Deployments of CPython are affected.
- Urgency
- Remediation is low urgency as the attack is unspecified.
- Action
- Consider updating to the latest version of CPython.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CPython
Get an email when a new CPython advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0196
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2025-127810.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-12781 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for CPython
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] CPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
- low[UPDATE] [low] CPython: Vulnerability allows file manipulationcert-bund · 2026-07-10
- medium[UPDATE] [medium] CPython: Vulnerability allows bypassing security measurescert-bund · 2026-07-10
- medium[UPDATE] [medium] Cpython: Multiple vulnerabilitiescert-bund · 2026-07-10
- medium[UPDATE] [medium] cPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
- low[UPDATE] [low] CPython: Vulnerability allows Denial of Servicecert-bund · 2026-07-10
More from CERT-Bund (BSI) Security Advisories
- medium[NEW] [medium] DENX U-Boot: Multiple vulnerabilities allow execution of arbitrary code and DoS2026-07-10
- medium[NEW] [medium] Samsung Android: Multiple vulnerabilities2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attack2026-07-10
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-10