Rsync: Out of bounds array access via negative index
A malicious client acting as the receiver of an rsync file transfer can trigger an out of bounds read of a heap based buffer, via a negative array index. The malicious rsync client requires at least read access to the remote rsync module in order to trigger the issue.
- BDU:2025-14729
- ALSA-2026:6390
- ALSA-2026:6436
- ALSA-2026:6825
- openSUSE-SU-2025:15827-1
- RHSA-2026:20602
- RHSA-2026:20603
- RHSA-2026:20604
- RHSA-2026:20696
- RHSA-2026:6390
- RHSA-2026:6436
- RHSA-2026:6825
- RLSA-2026:6390
- RLSA-2026:6436
- RLSA-2026:6825
- SUSE-SU-2025:4511-1
- SUSE-SU-2026:0005-1
- SUSE-SU-2026:0041-1
- SUSE-SU-2026:0069-1
- SUSE-SU-2026:20044-1
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Nov 18, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 23th percentile
- CWE
- CWE-129
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Report tools
Action score
17
Monitor
Low priority for now.
- CVSS
- 17 / 40 · 4.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · rapid7
- 4.3
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (rapid7). Independent of NVD's CPE analysis and usually ahead of it.
rsync rsync
- up to and including 3.4.1affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | rsync-daemon | before 3.4.1-2.el10_1.2 | 3.4.1-2.el10_1.2 |
| AlmaLinux:10 | rsync-rrsync | before 3.4.1-2.el10_1.2 | 3.4.1-2.el10_1.2 |
| AlmaLinux:8 | rsync | before 3.1.3-24.el8_10 | 3.1.3-24.el8_10 |
| AlmaLinux:8 | rsync-daemon | before 3.1.3-24.el8_10 | 3.1.3-24.el8_10 |
| AlmaLinux:9 | rsync | before 3.2.5-3.el9_7.2 | 3.2.5-3.el9_7.2 |
| AlmaLinux:9 | rsync-daemon | before 3.2.5-3.el9_7.2 | 3.2.5-3.el9_7.2 |
| AlmaLinux:9 | rsync-rrsync | before 3.2.5-3.el9_7.2 | 3.2.5-3.el9_7.2 |
| Alpine:v3.19 | rsync | before 3.4.1-r1 | 3.4.1-r1 |
| Debian:12 | rsync | before 3.2.7-1+deb12u4 | 3.2.7-1+deb12u4 |
| Debian:13 | rsync | before 3.4.1+ds1-5+deb13u1 | 3.4.1+ds1-5+deb13u1 |
| Debian:14 | rsync | before 3.4.1+ds1-7 | 3.4.1+ds1-7 |
| openSUSE:Tumbleweed | rsync | before 3.4.1-4.1 | 3.4.1-4.1 |
| Red Hat:enterprise_linux_eus:10.0 | rsync | before 0:3.4.1-2.el10_0.2 | 0:3.4.1-2.el10_0.2 |
| Red Hat:enterprise_linux_eus:10.0 | rsync-daemon | before 0:3.4.1-2.el10_0.2 | 0:3.4.1-2.el10_0.2 |
| Red Hat:enterprise_linux:10.1 | rsync | before 0:3.4.1-2.el10_1.2 | 0:3.4.1-2.el10_1.2 |
| Red Hat:enterprise_linux:10.1 | rsync-daemon | before 0:3.4.1-2.el10_1.2 | 0:3.4.1-2.el10_1.2 |
| Red Hat:enterprise_linux:10.1 | rsync-debuginfo | before 0:3.4.1-2.el10_1.2 | 0:3.4.1-2.el10_1.2 |
| Red Hat:enterprise_linux:10.1 | rsync-debugsource | before 0:3.4.1-2.el10_1.2 | 0:3.4.1-2.el10_1.2 |
| Red Hat:enterprise_linux:10.1 | rsync-rrsync | before 0:3.4.1-2.el10_1.2 | 0:3.4.1-2.el10_1.2 |
| Red Hat:enterprise_linux:8::baseos | rsync | before 0:3.1.3-24.el8_10 | 0:3.1.3-24.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-daemon | before 0:3.1.3-24.el8_10 | 0:3.1.3-24.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-debuginfo | before 0:3.1.3-24.el8_10 | 0:3.1.3-24.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-debugsource | before 0:3.1.3-24.el8_10 | 0:3.1.3-24.el8_10 |
| Red Hat:enterprise_linux:9::appstream | rsync-daemon | before 0:3.2.5-3.el9_7.2 | 0:3.2.5-3.el9_7.2 |
+21
Same product
rsync: all recordsOther highest-scoring records for the same primary product.
- CVE-2007-6200Unspecified vulnerability in rsync before 3.0.0pre6, when running a writable rsync daemon, allows remote attackers to bypass exclude, exclud41Plan
- CVE-2007-6199rsync before 3.0.0pre6, when running a writable rsync daemon that is not using chroot, allows remote attackers to access restricted files vi38Monitor
- CVE-2007-4091Multiple off-by-one errors in the sender.c in rsync 2.6.9 might allow remote attackers to execute arbitrary code via directory names that ar28Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:rsync | 3.2.5-3.el9_7.2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:rsync-daemon | 3.2.5-3.el9_7.2 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:rsync-rrsync | 3.2.5-3.el9_7.2 · AlmaLinux:9 | Package registry (OSV) |
| alpine:rsync | 3.4.1-r1 · Alpine:v3.19 | Package registry (OSV) |
| debian:rsync | 3.2.7-1+deb12u4 · Debian:12 | Package registry (OSV) |
| opensuse:rsync | 3.2.7-150600.3.14.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:rsync | 0:3.2.3-19.el9_2.3 · Red Hat:rhel_e4s:9.2::baseos | Package registry (OSV) |
| red hat:rsync-daemon | 0:3.2.3-19.el9_2.3 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:rsync-debuginfo | 0:3.2.5-3.el9_7.2 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:rsync-debugsource | 0:3.2.5-3.el9_7.2 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:rsync-rrsync | 0:3.2.5-3.el9_7.2 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| rocky linux:rsync | 0:3.2.5-3.el9_7.2 · Rocky Linux:9 | Package registry (OSV) |
| suse:rsync | 3.2.7-150600.3.14.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Calum HuttonSnyk Research Teamfinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-129 · Improper Validation of Array IndexCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- attackerkb.com/assessments/fbacb2a6-d1cd-4011-bb3a-f06b1c8306b1
- github.com/RsyncProject/rsync/commit/797e17fc4a6f15e3b1756538a9f812b63942686f
Vendor advisories and official records. Exploit/PoC links are deliberately left out.