What’s Vulnerable › Vulnerabilities

CVE-2026-44603

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-193

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 products

• torproject Tor: before 0.4.9.7 — fixed in 0.4.9.7

How to fix

Upgrade to a fixed version: torproject Tor 0.4.9.7. Check the vendor advisory for mitigations.

References

• https://forum.torproject.org/c/news/tor-release-announcement/28
• https://gitlab.torproject.org/tpo/core/tor/-/commit/1703df3d439c83c2184e259fad1cfa19240f9c89
• https://gitlab.torproject.org/tpo/core/tor/-/work_items/41245
• https://www.openwall.com/lists/oss-security/2026/05/06/8

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