Rsync < 3.4.3 Integer Overflow Information Disclosure
Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.
- Published
- May 19, 2026
- Updated
- Sep 1, 2026
- EPSS
- 0.8% · 55th percentile
- CWE
- CWE-125
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulnCheck
- 6.1
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
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 helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| samba | rsync | cpe:2.3:a:samba:rsync |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- samba rsyncup to 3.4.2 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.
RsyncProject rsync
- before 3.4.3affected · 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 | before 3.4.4-1.el10_2 | 3.4.4-1.el10_2 |
| AlmaLinux:10 | rsync-daemon | before 3.4.4-1.el10_2 | 3.4.4-1.el10_2 |
| AlmaLinux:10 | rsync-rrsync | before 3.4.4-1.el10_2 | 3.4.4-1.el10_2 |
| AlmaLinux:8 | rsync | before 3.1.3-27.el8_10 | 3.1.3-27.el8_10 |
| AlmaLinux:8 | rsync-daemon | before 3.1.3-27.el8_10 | 3.1.3-27.el8_10 |
| AlmaLinux:9 | rsync | before 3.2.5-7.el9_8.2 | 3.2.5-7.el9_8.2 |
| AlmaLinux:9 | rsync-daemon | before 3.2.5-7.el9_8.2 | 3.2.5-7.el9_8.2 |
| AlmaLinux:9 | rsync-rrsync | before 3.2.5-7.el9_8.2 | 3.2.5-7.el9_8.2 |
| Alpine:v3.20 | rsync | before 3.4.3-r0 | 3.4.3-r0 |
| Debian:12 | rsync | before 3.2.7-1+deb12u5 | 3.2.7-1+deb12u5 |
| Debian:13 | rsync | before 3.4.1+ds1-5+deb13u3 | 3.4.1+ds1-5+deb13u3 |
| Debian:14 | rsync | before 3.4.3+ds1-1 | 3.4.3+ds1-1 |
| openSUSE:Leap 16.0 | rsync | before 3.4.1-160000.6.1 | 3.4.1-160000.6.1 |
| openSUSE:Tumbleweed | rsync | before 3.4.3-1.1 | 3.4.3-1.1 |
| Red Hat:enterprise_linux:10.2 | rsync | before 0:3.4.4-1.el10_2 | 0:3.4.4-1.el10_2 |
| Red Hat:enterprise_linux:10.2 | rsync-daemon | before 0:3.4.4-1.el10_2 | 0:3.4.4-1.el10_2 |
| Red Hat:enterprise_linux:10.2 | rsync-debuginfo | before 0:3.4.4-1.el10_2 | 0:3.4.4-1.el10_2 |
| Red Hat:enterprise_linux:10.2 | rsync-debugsource | before 0:3.4.4-1.el10_2 | 0:3.4.4-1.el10_2 |
| Red Hat:enterprise_linux:10.2 | rsync-rrsync | before 0:3.4.4-1.el10_2 | 0:3.4.4-1.el10_2 |
| Red Hat:enterprise_linux:8::baseos | rsync | before 0:3.1.3-27.el8_10 | 0:3.1.3-27.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-daemon | before 0:3.1.3-27.el8_10 | 0:3.1.3-27.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-debuginfo | before 0:3.1.3-27.el8_10 | 0:3.1.3-27.el8_10 |
| Red Hat:enterprise_linux:8::baseos | rsync-debugsource | before 0:3.1.3-27.el8_10 | 0:3.1.3-27.el8_10 |
| Red Hat:enterprise_linux:9::appstream | rsync-daemon | before 0:3.2.5-7.el9_8.2 | 0:3.2.5-7.el9_8.2 |
+10
Same product
samba: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-12084Rsync: heap buffer overflow in rsync due to improper checksum length handling61This week
- CVE-2017-16548The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not check for a trailing '\0' character in an xattr name, w41Plan
- CVE-2017-17434The daemon in rsync 3.1.2, and 3.1.3-development before 2017-12-03, does not check for fnamecmp filenames in the daemon_filter_list data str40Plan
- CVE-2017-15994rsync 3.1.3-development before 2017-10-24 mishandles archaic checksums, which makes it easier for remote attackers to bypass intended access39Monitor
- CVE-2026-53791rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header36Monitor
- CVE-2026-70461rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry35Monitor
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 |
|---|---|---|
| RsyncProject rsync | 3.4.3 | Vendor (CNA) |
| almalinux:rsync | 3.4.4-1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:rsync-daemon | 3.4.4-1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:rsync-rrsync | 3.4.4-1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| alpine:rsync | 3.4.3-r0 · Alpine:v3.20 | Package registry (OSV) |
| debian:rsync | 3.2.7-1+deb12u5 · Debian:12 | Package registry (OSV) |
| opensuse:rsync | 3.4.3-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:rsync | 0:3.4.4-1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:rsync-daemon | 0:3.4.4-1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:rsync-debuginfo | 0:3.4.4-1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:rsync-debugsource | 0:3.4.4-1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:rsync-rrsync | 0:3.4.4-1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| rocky linux:rsync | 0:3.4.4-1.el10_2 · Rocky Linux:10 | Package registry (OSV) |
| suse:rsync | 3.4.1-160000.4.1 · SUSE:Linux Enterprise Server 16.0 | 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.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Omar Elsayed (@seks99x)finder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-436200 days apartRsync < 3.4.3 Out-of-Bounds Array Read via recv_files()27Monitor
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
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/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
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
- github.com/RsyncProject/rsync/releases/tag/v3.4.3
- github.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwq
- www.vulncheck.com/advisories/rsync-integer-overflow-information-disclosure
- access.redhat.com/errata/RHSA-2026:26332
- access.redhat.com/errata/RHSA-2026:26408
- access.redhat.com/errata/RHSA-2026:26410
- access.redhat.com/errata/RHSA-2026:29197
- access.redhat.com/security/cve/CVE-2026-43618
- bugzilla.redhat.com/show_bug.cgi?id=2469054
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43618.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.