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Fencer Vulns
medium 5.3

CVE-2026-79778 json

rclone before v1.75.0 Denial of Service via TUS nil-response panic

published 2026-08-05 3 mo ago modified 2026-09-25 44 d ago also BIT-rclone-2026-79778 , EUVD-2026-65536 , GHSA-3x6r-wxxg-53vv , GO-2026-6183

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

rclone before v1.75.0 contains a denial of service vulnerability in the WebDAV TUS creation handler that dereferences a nil response before checking for transport errors. A malicious or compromised configured endpoint can reset connections during TUS uploads to trigger a panic that terminates unrecovered goroutines and halts unrelated work in long-lived processes.

Patch / fix

  • go github.com/rclone/rclone 1.75.0
  • bitnami rclone 1.75.0
  • rclone rclone 1.75.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-79778 updated cvss 5.3

github.com/rclone/rclone: rclone: Denial of Service via WebDAV TUS nil-response panic

  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9
    affected: workaround, no fix available “Avoid using rclone's WebDAV backend with TUS-enabled servers from untrusted sources. If TUS uploads are not required, use a WebDAV server configuration that does not advertise TUS support.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/rclone/rclone/security/advisories/GHSA-3x6r-wxxg-53vv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 4.0 6.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
go github.com/rclone/rclone
<1.75.0
1.75.0
bitnami rclone
<1.75.0
1.75.0

Affected products

  • rclone rclone

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.