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CVE details

CVE-2025-15661

libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation.

Score
8.3 high
Published
2026-06-18
Links
NVD · cve.org

Matched ports (2)

PortPackageVersionStatusMaintainer
security/libssh2libssh21.11.1_1,3unaddressedsbz@FreeBSD.org
security/linux-c7-libssh2linux-c7-libssh21.8.0_2unaddressedemulation@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>libssh2</name>
	<range><lt>FIXME</lt></range>
      </package>
      <package>
	<name>linux-c7-libssh2</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>libssh2 through 1.11.1, fixed in commit 2dae302, contains an
	out-of-bounds heap read vulnerability in the sftp_symlink() function
	in src/sftp.c that allows a malicious SSH server or man-in-the-middle
	attacker to disclose heap memory contents or cause a crash by sending
	a crafted SSH_FXP_NAME response. Attackers can supply a link_len value
	larger than the actual packet data in SSH_FXP_NAME responses for SFTP
	READLINK and REALPATH operations, triggering a heap buffer over-read
	of up to target_len minus one bytes due to the missing validation of
	available packet buffer size before the memcpy operation.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2025-15661</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2025-15661</url>
    </references>
    <dates>
      <discovery>2026-06-18</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>