PT-2026-71655

Name of the Vulnerable Software and Affected Versions rsync versions 3.4.2 through 3.4.x Description A denial of service issue exists where a remote sender can exhaust system resources on the receiver. This occurs because the short alias --zt for the --compress-threads option bypasses the string...

PT-2026-71625

Name of the Vulnerable Software and Affected Versions rsync versions prior to 3.5.0 Description Authenticated clients can bypass module-level filter restrictions by providing malicious --filter merge file directives. During filter evaluation, attackers can inject client-side merge file directives...

PT-2026-71637

Name of the Vulnerable Software and Affected Versions rsync versions prior to 3.5.0 Description A symlink race condition exists where a local attacker can cause the software to apply arbitrary Access Control Lists ACLs or extended attributes to unintended files. This occurs when a symlink is...

PT-2026-71638

Name of the Vulnerable Software and Affected Versions rsync versions prior to 3.5.0 Description A symlink race condition exists in the --remove-source-files feature. This occurs when an attacker with symlink creation access atomically substitutes a symlink for a source file between the completion...

PT-2026-71654

Name of the Vulnerable Software and Affected Versions rsync versions 3.2.0 through 3.2.3 rsync-ssl versions prior to 3.4.5 Description A TLS certificate validation issue allows on-path attackers to intercept encrypted sessions by presenting self-signed or invalid certificates. This occurs because...

CVE-2026-53797: Improper Link Resolution Before File Access

rsync before 3.5.0 contains a symlink race condition vulnerability in the sender's source tree traversal that allows an attacker who can manipulate a parent directory of the source tree to redirect file reads to unintended paths. Attackers can atomically replace a parent directory component with ...

CVE-2026-53800: Improper Link Resolution Before File Access

rsync before 3.5.0 contains a symlink race condition vulnerability in the --remove-source-files feature that allows attackers with symlink creation access to cause arbitrary file deletion. Attackers can atomically substitute a symlink for a source file between transfer completion and the unlink...

CVE-2026-70455: Allocation of Resources Without Limits or Throttling

rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N...

CVE-2026-70457: Incorrect Calculation of Buffer Size

rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parsesizearg where the return value of snprintf is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that woul...

CVE-2026-70454: Improper Certificate Validation

rsync 3.2.0 through 3.2.3 openssl mode and rsync-ssl through 3.4.4 stunnel mode contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to valida...

CVE-2026-70457: Incorrect Calculation of Buffer Size

rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parsesizearg where the return value of snprintf is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that woul...

CVE-2026-53791: Authentication Bypass by Spoofing

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a...

CVE-2026-53794: Improper Validation of Specified Quantity in Input

rsync before 3.5.0 contains a logic error in --max-alloc handling that allows a sender or configuration setting --max-alloc=0 to disable allocation sanity checks entirely rather than enforcing a zero-byte cap. Attackers can exploit this flaw to cause the receiver to attempt unbounded memory...

CVE-2026-53796: Improper Link Resolution Before File Access

rsync before 3.5.0 contains a time-of-check to time-of-use TOCTOU race condition vulnerability in the non-daemon receiver's destination directory handling that allows an attacker who can manipulate destination path parent components to redirect file writes to unintended locations. Attackers can...

CVE-2026-53801: Improper Link Resolution Before File Access

rsync before 3.5.0 contains a symlink race condition vulnerability in the sender's directory scanning logic that allows attackers to cause the sender to enumerate and transfer files outside the module root's intended subtree. Attackers who can create or manipulate symlinks in a path component of...

CVE-2026-70454: Improper Certificate Validation

rsync 3.2.0 through 3.2.3 openssl mode and rsync-ssl through 3.4.4 stunnel mode contain a TLS certificate validation vulnerability that allows on-path attackers to intercept encrypted sessions by presenting self-signed or otherwise invalid certificates. Attackers can exploit the failure to valida...

CVE-2026-53786: Incorrect Authorization

rsync before 3.5.0 contains a filter rule bypass vulnerability that allows authenticated clients to override module-level filter restrictions by supplying malicious --filter merge file directives. Attackers can inject client-side merge file directives during filter evaluation to introduce rules...

CVE-2026-53791: Authentication Bypass by Spoofing

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a...

CVE-2026-53798: Incorrect Type Conversion or Cast

rsync before 3.5.0 contains a privilege confusion vulnerability in the name-converter subprocess uid/gid mapping that allows local attackers to cause transferred files to be owned by root by influencing name-converter responses to return empty values. When the name-converter subprocess returns an...

CVE-2026-53799: Improper Link Resolution Before File Access

rsync before 3.5.0 contains a symlink race condition vulnerability that allows local attackers to cause rsync to apply arbitrary ACLs or extended attributes to unintended files by substituting a symlink at a predictable destination path between the file write and the subsequent aclsetfile or...