Vulnerability in github.com/rclone/rclone (CVE-2026-88015)
Summary
Vulnerability in github.com/rclone/rclone (CVE-2026-88015). Risk of unauthorized operations or information disclosure. Exploitable via fs.RangeOption. Mitigation: upgrade to 1.75.1 or later.
Original description
The description as published by the source.
rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.1, backend/local with --links or links=true exposes symlink targets as .rclonelink objects, and fs.RangeOption.Decode can pass an unchecked positive Range start through Object.Open and openTranslatedLink. The function slices the target string as linkdst[offset:], so a Range start larger than the target length causes a deterministic slice-bounds panic when lib/http/serve exposes the object through HTTP or WebDAV. Go net/http normally recovers the panic per connection, causing request-level denial of service rather than terminating the entire process. This issue is fixed in version 1.75.1.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-88015 has been found in github.com/rclone/rclone.
Attackers can target a specific entry point like fs.RangeOption over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade github.com/rclone/rclone to 1.75.1 or later.
If unsure, ask your IT team or search "github.com/rclone/rclone CVE-2026-88015" on the vendor's site.
CVE-2026-88015 (github.com/rclone/rclone) — CWE-190 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: fs.RangeOption / offset / openTranslatedLink / RangeOption.Decode
Patched: 1.75.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-190) exists in github.com/rclone/rclone. Attackers reach the vulnerable code path via fs.RangeOption without authentication.
Check the vendor advisory for the affected versions of github.com/rclone/rclone. Attack surface: fs.RangeOption / offset / openTranslatedLink / RangeOption.Decode.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to 1.75.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/rclone/rclone' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'github.com/rclone/rclone' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/rclone/rcloneを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade github.com/rclone/rclone to 1.75.1ステージング環境で 1.75.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-88015 rclone
- Ubuntu UBUNTU-CVE-2026-88015 rclone
References
- advisory github.com
- patch github.com
- web github.com
- web nvd.nist.gov
- web github.com