CVE-2026-43618
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 3.2.7-1+deb12u5 |
| debian | bullseye | fixed | 3.2.3-4+deb11u4 |
| debian | forky | fixed | 3.4.3+ds1-1 |
| debian | sid | fixed | 3.4.3+ds1-1 |
| debian | trixie | fixed | 3.4.1+ds1-5+deb13u3 |
| windows | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| samba | rsync | {"endIncluding":"3.4.2"} | |
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.4.3
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-g37v-g3gj-pmwq
- https://www.vulncheck.com/advisories/rsync-integer-overflow-information-disclosure
- https://www.suse.com/security/cve/CVE-2026-43618.html
- https://security-tracker.debian.org/tracker/CVE-2026-43618
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43618
CWEs
CWE-125 CWE-190
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.