5.9Medium

CVE-2026-77587

torproject Tor Published: 2026-08-20 23:47 (2 months ago)

Description

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.

Weakness (CWE): CWE-911 CWE-416

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
torproject	Tor	0.4.8.1-alpha – < 0.4.9.11

References and patches

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.11/ChangeLog Permissions RequiredRelease NotesVendor Advisory

CPE matches (NVD) (1)

cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* < 0.4.9.11

CVSS score

5.9Medium

Source: mitre · CVSS 3.1

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

All scores (3)

cna	CVSS 3.1	5.9Medium
cve@mitre.org	CVSS 3.1	5.9Medium
nvd	CVSS 3.1	7.5High

EPSS (chance of exploitation in 30 days)

0.40%

higher than 35% of all CVEs

CISA assessment (SSVC)

Exploitation: none
Automatable: no
Technical impact: partial

Timeline

ID reserved2026-08-20
Published2026-08-20 23:47
Reached IP-DB2026-10-24 23:47
Last updated2026-10-18 23:10

Assigned by (CNA): mitre
NVD status: Analyzed

View at source: CVE.org · NVD

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