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HIGH

CVE-2026-70453

CVSS v3

7.5

HIGH

EPSS Score

0.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • rsyncAlmaLinux:10all versions · fixed in 3.5.0-3.el10_2and 2 other packages
  • rsyncAlmaLinux:9all versions · fixed in 3.2.7-1.el9_8and 2 other packages
  • rsyncAlmaLinux:8all versions · fixed in 3.1.3-28.el8_10and 1 other package

Vendor advisories

  • CVE-2026-70453 Red Hat Product Security49 products fixed · 5 known affected

    rsync: rsync: Denial of Service via Algorithmic Complexity

    rsync as a component of Red Hat Enterprise Linux 6 · rsync.src as a component of Red Hat Enterprise Linux 6 · rsync as a component of Red Hat Enterprise Linux 7

  • RHSA-2026:79357 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Cost Management On-Premise container image update

  • RHSA-2026:74095 Red Hat Product Security14 products fixed

    Red Hat Security Advisory: rsync security, bug fix, and enhancement update

  • RHSA-2026:71446 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.22.16 bug fix and security update

  • RHSA-2026:67462 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: rsync security, bug fix, and enhancement update

  • RHSA-2026:67463 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: rsync security, bug fix, and enhancement update

Full record on NVD

Description

rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU resources with a modest number of crafted entries, causing a sustained denial of service.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-08-13
Last Modified
2026-08-13

Frequently asked questions

What is CVE-2026-70453?

rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU resources with a modest number of crafted entries, causing a sustained denial of service.

Is CVE-2026-70453 actively exploited?

Active exploitation of CVE-2026-70453 has not been confirmed. Its EPSS score was 0.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-70453?

CVE-2026-70453 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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