Vulnerability · Published May 7, 2026 · Assigned by mitre
CVE-2026-44603
Low 3.7
In plain English
A low-severity security flaw in Tor from torproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.3%top 72.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tor | 0.4.9.8-0+deb12u1 | DEBIAN-CVE-2026-44603 |
| Debian:13 | tor | 0.4.9.8-0+deb13u1 | DEBIAN-CVE-2026-44603 |
| Debian:14 | tor | 0.4.9.8-1 | DEBIAN-CVE-2026-44603 |
| Ubuntu:22.04:LTS | tor | no fix listed | UBUNTU-CVE-2026-44603 |
| Ubuntu:24.04:LTS | tor | no fix listed | UBUNTU-CVE-2026-44603 |
| Ubuntu:25.10 | tor | no fix listed | UBUNTU-CVE-2026-44603 |
| Ubuntu:26.04:LTS | tor | no fix listed | UBUNTU-CVE-2026-44603 |
| Ubuntu:26.10 | tor | no fix listed | UBUNTU-CVE-2026-44603 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| torproject | Tor | 0 – before 0.4.9.7 |
Weakness: CWE-193 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L