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Fencer Vulns
high 7.5

CVE-2026-119741 json

rsync < 3.5.2 Denial of Service via hash_search() Checksum Collisions

published 2026-11-03 6 d ago modified 2026-11-04 5 d ago also EUVD-2026-115914

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

rsync before 3.5.2 contains a denial of service vulnerability in the delta-transfer sender's hash_search() in match.c that allows malicious receivers to trigger unbounded strong-checksum work at consecutive offsets. Unauthenticated attackers pulling from a public daemon module can supply weak checksums colliding with consecutive rolling windows plus non-matching strong checksums, exhausting sender CPU across concurrent connections.

Patch / fix

  • RsyncProject rsync 3.5.2
  • rsync Debian 12 3.5.0+ds1-0+deb12u1

debian advisories DEBIAN-CVE-2026-119741

  • rsync openSUSE Tumbleweed 3.5.2-1.1

opensuse advisories openSUSE-SU-2026:12443-1

  • rsync Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 3.5.2-r0

alpine advisories ALPINE-CVE-2026-119741

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-119741 updated cvss 7.5

rsync: rsync: Denial of Service via crafted checksums during delta transfer

  • Red Hat Enterprise Linux 6 rsync, rsync 3.4.1-2.el10_0.2 Red Hat Enterprise Linux 7 rsync, rsync 3.4.1-2.el10_0.2 Red Hat Enterprise Linux 8 rsync, rsync-daemon, rsync 3.4.1-2.el10_0.2 Red Hat Enterprise Linux 9 rsync, rsync-daemon, rsync-rrsync, rsync 3.4.1-2.el10_0.2 Red Hat Enterprise Linux 10 rsync 3.4.1-2.el10_0.2 Red Hat Hardened Images rsync 3.4.1-2.el10_0.2
    +2 more products
    Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available

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
none
Automatable
yes
Technical impact
partial
Assessed
6 d ago

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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 products

  • RsyncProject rsync

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity

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.