CVE-2026-77641

tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.

Database specific

{
    "cna_assigner": "mitre",
    "cwe_ids": [
        "CWE-252"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77641.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "0.4.8.1-alpha"
                },
                {
                    "fixed": "0.4.9.9"
                }
            ],
            "source": "AFFECTED_FIELD"
        },
        {
            "extracted_events": [
                {
                    "introduced": "0.4.8.1-alpha"
                },
                {
                    "fixed": "0.4.9.9"
                }
            ],
            "source": "CPE_FIELD"
        },
        {
            "extracted_events": [
                {
                    "fixed": "0.4.9.9"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

References

Affected packages

Git / gitlab.torproject.org/tpo/core/tor

Affected ranges

Type

GIT

Repo

https://gitlab.torproject.org/tpo/core/tor

Events

Introduced

Fixed

74b53bd1992da4eca7a89668d9a1a040faff7a73

Database specific

Show details

{
    "cpe": "cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.4.9.9"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

debian-version-0.*

debian-version-0.0.1+0.0.2pre19-1

debian-version-0.0.1+0.0.2pre20-1

debian-version-0.0.1+0.0.2pre20-2

debian-version-0.0.1+0.0.2pre21-1

debian-version-0.0.1+0.0.2pre22-1

debian-version-0.0.1+0.0.2pre23-1

debian-version-0.0.1+0.0.2pre24-1

debian-version-0.0.1+0.0.2pre25-1

debian-version-0.0.1+0.0.2pre26-1

debian-version-0.0.1+0.0.2pre27-1

debian-version-0.0.2-1

debian-version-0.0.3-1

debian-version-0.0.4-1

debian-version-0.0.5+0.0.6rc2-1

debian-version-0.0.5+0.0.6rc3-1

debian-version-0.0.5+0.0.6rc4-1

debian-version-0.0.5-1

debian-version-0.0.6-1

debian-version-0.0.6.1-1

debian-version-0.0.6.2-1

debian-version-0.0.7+0.0.8rc1-1

debian-version-0.0.7-1

debian-version-0.0.7.1-1

debian-version-0.0.7.2+0.0.8pre2-1

debian-version-0.0.7.2+0.0.8pre3-1

debian-version-0.0.8+0.0.9pre1-1

debian-version-0.0.8+0.0.9pre2-1

debian-version-0.0.8+0.0.9pre3-1

debian-version-0.0.8+0.0.9pre4-1

debian-version-0.0.8+0.0.9pre5-1

debian-version-0.0.8+0.0.9pre5-2

debian-version-0.0.8+0.0.9pre6-1

debian-version-0.0.8+0.0.9rc1-1

debian-version-0.0.8+0.0.9rc2-1

debian-version-0.0.8+0.0.9rc3-1

debian-version-0.0.8+0.0.9rc5-1

debian-version-0.0.8+0.0.9rc6-1

debian-version-0.0.8+0.0.9rc7-1

debian-version-0.0.8-1

debian-version-0.0.9.1-1

debian-version-0.0.9.10-1

debian-version-0.0.9.2-1

debian-version-0.0.9.3-1

debian-version-0.0.9.4-1

debian-version-0.0.9.5-1

debian-version-0.0.9.6-1

debian-version-0.0.9.7-1

debian-version-0.0.9.8-1

debian-version-0.0.9.9-1

debian-version-0.1.0.1-rc-cvs-200503310807-1

debian-version-0.1.0.1-rc-cvs-200504010815-1

debian-version-0.1.0.10-0-pre.1

debian-version-0.1.0.11-0-pre.1

debian-version-0.1.0.11-1

debian-version-0.1.0.12-1

debian-version-0.1.0.13-1

debian-version-0.1.0.14-1

debian-version-0.1.0.14-2

debian-version-0.1.0.15-1

debian-version-0.1.0.16-1

debian-version-0.1.0.17-1

debian-version-0.1.0.2-rc-200504011500-1

debian-version-0.1.0.2-rc-200504011640-1

debian-version-0.1.0.2-rc-cvs-200504031300-1

debian-version-0.1.0.2-rc-cvs-200504061620-1

debian-version-0.1.0.2-rc-cvs-200504062112-1

debian-version-0.1.0.3-rc-200504080730-1

debian-version-0.1.0.3-rc-200504231430-1

debian-version-0.1.0.3-rc-cvs-200504231630-1

debian-version-0.1.0.4-rc-200504232130-1

debian-version-0.1.0.5-rc-200504272000-1

debian-version-0.1.0.7-rc-200505171420-1

debian-version-0.1.0.8-rc-1

debian-version-0.1.0.9-rc-1

debian-version-0.1.1.10-alpha-1

debian-version-0.1.1.11-alpha-1

debian-version-0.1.1.12-alpha-1

debian-version-0.1.1.13-alpha-1

debian-version-0.1.1.14-alpha-1

debian-version-0.1.1.15-rc-1

debian-version-0.1.1.16-rc-1

debian-version-0.1.1.17-rc-1

debian-version-0.1.1.18-rc-1

debian-version-0.1.1.19-rc-1

debian-version-0.1.1.20-1

debian-version-0.1.1.21-1

debian-version-0.1.1.22-1

debian-version-0.1.1.5-alpha-1

debian-version-0.1.1.6-alpha-1

debian-version-0.1.1.6-alpha-2

debian-version-0.1.1.7-alpha-1

debian-version-0.1.1.8-alpha-1

debian-version-0.1.1.9-alpha-1

tor-0.*

tor-0.0.2

tor-0.0.2pre13

tor-0.0.2pre14

tor-0.0.2pre16

tor-0.0.2pre17

tor-0.0.2pre18

tor-0.0.2pre19

tor-0.0.2pre20

tor-0.0.2pre22

tor-0.0.2pre23

tor-0.0.2pre24

tor-0.0.2pre25

tor-0.0.2pre27

tor-0.0.2pre8

tor-0.0.3

tor-0.0.4

tor-0.0.5

tor-0.0.6

tor-0.0.6.1

tor-0.0.6.2

tor-0.0.6incompat-merged

tor-0.0.7

tor-0.0.7.1

tor-0.0.7.2

tor-0.0.7rc1

tor-0.0.8

tor-0.0.8.1

tor-0.0.8pre1

tor-0.0.8pre2

tor-0.0.8pre3

tor-0.0.8rc1

tor-0.0.8rc2

tor-0.0.9

tor-0.0.9.1

tor-0.0.9.10

tor-0.0.9.2

tor-0.0.9.3

tor-0.0.9.5

tor-0.0.9.6

tor-0.0.9.7

tor-0.0.9.9

tor-0.0.9pre1

tor-0.0.9pre2

tor-0.0.9pre3

tor-0.0.9pre4

tor-0.0.9pre5

tor-0.0.9pre6

tor-0.0.9rc1

tor-0.0.9rc2

tor-0.0.9rc3

tor-0.0.9rc4

tor-0.0.9rc5

tor-0.0.9rc6

tor-0.0.9rc7

tor-0.1.0.1-rc

tor-0.1.0.10

tor-0.1.0.11

tor-0.1.0.12

tor-0.1.0.13

tor-0.1.0.14

tor-0.1.0.15

tor-0.1.0.16

tor-0.1.0.17

tor-0.1.0.2-rc

tor-0.1.0.4-rc

tor-0.1.0.5-rc

tor-0.1.0.6-rc

tor-0.1.0.7-rc

tor-0.1.0.9-rc

tor-0.1.1.1-alpha

tor-0.1.1.10-alpha

tor-0.1.1.11-alpha

tor-0.1.1.12-alpha

tor-0.1.1.13-alpha

tor-0.1.1.14-alpha

tor-0.1.1.15-rc

tor-0.1.1.16-rc

tor-0.1.1.17-rc

tor-0.1.1.18-rc

tor-0.1.1.19-rc

tor-0.1.1.2-alpha

tor-0.1.1.20

tor-0.1.1.21

tor-0.1.1.22

tor-0.1.1.4-alpha

tor-0.1.1.5-alpha

tor-0.1.1.6-alpha

tor-0.1.1.7-alpha

tor-0.1.1.8-alpha

tor-0.1.1.9-alpha

tor-0.1.2.1-alpha

tor-0.1.2.2-alpha

tor-0.1.2.3-alpha

tor-0.1.2.4-alpha

tor-0.1.2.5-alpha

tor-0.1.2.6-alpha

tor-0.1.2.7-alpha

tor-0.1.2.8-beta

tor-0.1.2.9-rc

tor-0.2.0.1-alpha

tor-0.2.0.10-alpha

tor-0.2.0.11-alpha

tor-0.2.0.12-alpha

tor-0.2.0.13-alpha

tor-0.2.0.14-alpha

tor-0.2.0.15-alpha

tor-0.2.0.16-alpha

tor-0.2.0.17-alpha

tor-0.2.0.18-alpha

tor-0.2.0.19-alpha

tor-0.2.0.2-alpha

tor-0.2.0.20-rc

tor-0.2.0.3-alpha

tor-0.2.0.4-alpha@11197

tor-0.2.0.5-alpha

tor-0.2.0.6-alpha

tor-0.2.0.7-alpha

tor-0.2.0.8-alpha

tor-0.2.0.9-alpha

tor-0.2.1.1-alpha

tor-0.2.1.10-alpha

tor-0.2.1.11-alpha

tor-0.2.1.13-alpha

tor-0.2.1.14-rc

tor-0.2.1.2-alpha

tor-0.2.1.3-alpha

tor-0.2.1.4-alpha

tor-0.2.1.5-alpha

tor-0.2.1.6-alpha

tor-0.2.1.7-alpha

tor-0.2.1.8-alpha

tor-0.2.1.9-alpha

tor-0.2.2.1-alpha

tor-0.2.2.10-alpha

tor-0.2.2.11-alpha

tor-0.2.2.12-alpha

tor-0.2.2.13-alpha

tor-0.2.2.14-alpha

tor-0.2.2.15-alpha

tor-0.2.2.16-alpha

tor-0.2.2.2-alpha

tor-0.2.2.3-alpha

tor-0.2.2.4-alpha

tor-0.2.2.5-alpha

tor-0.2.2.6-alpha

tor-0.2.2.7-alpha

tor-0.2.2.8-alpha

tor-0.2.2.9-alpha

tor-0.2.3.1-alpha

tor-0.2.3.10-alpha

tor-0.2.3.11-alpha

tor-0.2.3.12-alpha

tor-0.2.3.13-alpha

tor-0.2.3.14-alpha

tor-0.2.3.15-alpha

tor-0.2.3.16-alpha

tor-0.2.3.17-beta

tor-0.2.3.2-alpha

tor-0.2.3.3-alpha

tor-0.2.3.4-alpha

tor-0.2.3.5-alpha

tor-0.2.3.6-alpha

tor-0.2.3.7-alpha

tor-0.2.3.8-alpha

tor-0.2.3.9-alpha

tor-0.2.4.1-alpha

tor-0.2.4.10-alpha

tor-0.2.4.2-alpha

tor-0.2.4.3-alpha

tor-0.2.4.4-alpha

tor-0.2.4.5-alpha

tor-0.2.4.6-alpha

tor-0.2.4.7-alpha

tor-0.2.4.8-alpha

tor-0.2.4.9-alpha

tor-0.2.5.1-alpha

tor-0.2.5.2-alpha

tor-0.2.5.3-alpha

tor-0.2.5.4-alpha

tor-0.2.5.5-alpha

tor-0.2.6.1-alpha

tor-0.2.6.2-alpha

tor-0.2.6.3-alpha

tor-0.2.7.0-root

tor-0.2.7.1-alpha

tor-0.2.7.2-alpha

tor-0.2.7.3-rc

tor-0.2.8.1-alpha

tor-0.2.8.2-alpha

tor-0.2.9.0-root

tor-0.2.9.1-alpha

tor-0.2.9.2-alpha

tor-0.2.9.3-alpha

tor-0.2.9.4-alpha

tor-0.3.0.1-alpha

tor-0.3.0.2-alpha

tor-0.3.0.3-alpha

tor-0.3.1.1-alpha

tor-0.3.1.2-alpha

tor-0.3.1.3-alpha

tor-0.3.2.1-alpha

tor-0.3.2.2-alpha

tor-0.3.3.0-alpha-dev

tor-0.3.3.1-alpha

tor-0.3.3.2-alpha

tor-0.3.4.0-alpha-dev

tor-0.3.4.1-alpha

tor-0.3.4.2-alpha

tor-0.3.5.0-alpha-dev

tor-0.3.5.1-alpha

tor-0.3.5.2-alpha

tor-0.3.5.3-alpha

tor-0.4.0.1-alpha

tor-0.4.1.0-alpha-dev

tor-0.4.1.1-alpha

tor-0.4.1.2-alpha

tor-0.4.2.1-alpha

tor-0.4.2.2-alpha

tor-0.4.3.0-alpha-dev

tor-0.4.3.1-alpha

tor-0.4.3.2-alpha

tor-0.4.4.0-alpha-dev

tor-0.4.5.0-alpha-dev

tor-0.4.5.1-alpha

tor-0.4.6.0-alpha-dev

tor-0.4.6.1-alpha

tor-0.4.6.2-alpha

tor-0.4.7.0-alpha-dev

tor-0.4.7.1-alpha

tor-0.4.7.2-alpha

tor-0.4.7.3-alpha

tor-0.4.7.4-alpha

tor-0.4.7.5-alpha

tor-0.4.7.6-rc

tor-0.4.7.7

tor-0.4.8.0-alpha-dev

tor-0.4.8.1-alpha

tor-0.4.8.2-alpha

tor-0.4.8.3-rc

tor-0.4.8.4

tor-0.4.9.0-alpha-dev

tor-0.4.9.1-alpha

tor-0.4.9.2-alpha

tor-0.4.9.3-alpha

tor-0.4.9.4-rc

tor-0.4.9.5

tor-0.4.9.6

tor-0.4.9.7

tor-0.4.9.8

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77641.json"