Vulnerability · Published Apr 13, 2026 · Assigned by mitre
CVE-2026-31048
Critical 9.8
In plain English
A critical-severity code injection in the pyro4 package (Ubuntu). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 52.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
An issue in the <code>pickle</code> protocol of Pyro v3.x allows attackers to execute arbitrary code via supplying a crafted pickled string message.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | pyro4 | no fix listed | UBUNTU-CVE-2026-31048 |
| Ubuntu:24.04:LTS | pyro4 | no fix listed | UBUNTU-CVE-2026-31048 |
| Ubuntu:24.04:LTS | pyro5 | no fix listed | UBUNTU-CVE-2026-31048 |
| Ubuntu:25.10 | pyro5 | no fix listed | UBUNTU-CVE-2026-31048 |
| Ubuntu:26.04:LTS | pyro5 | no fix listed | UBUNTU-CVE-2026-31048 |
| Ubuntu:26.10 | pyro5 | no fix listed | UBUNTU-CVE-2026-31048 |
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H