What is CVE-2026-77587?

CVE-2026-77587 is a medium-severity vulnerability in Torproject Tor, classified under CWE-911. CVSS score: 5.9/10. Published 2026-08-20.

How severe is CVE-2026-77587?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Torproject Tor

CVE-2026-77587

Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Torproject Tor

Weakness classification (CWE)

CWE-911

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-77587?: CVE-2026-77587 is a medium-severity vulnerability in Torproject Tor, classified under CWE-911. CVSS score: 5.9/10. Published 2026-08-20.
How severe is CVE-2026-77587?: Medium severity. CVSS v3 base score is 5.9 out of 10.