CVE-2025-32464

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic web sites and powers quite a number of the world's most visited ones.

Security Fix(es):

HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer overflow because of mishandling of the replacement of multiple short patterns with a longer one.(CVE-2025-32464)

HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer overflow because of mishandling of the replacement of multiple short patterns with a longer one.

HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer overflow because of mishandling of the replacement of multiple short patterns with a longer one.

HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer overflow because of mishandling of the replacement of multiple short patterns with a longer one.

BUG/MEDIUM: sample: fix risk of overflow when replacing multiple regex back-refsAleandro Prudenzano of Doyensec and Edoardo Geraci of Codean Labs reported a bug in sample_conv_regsub(), which can cause replacements of multiple back-references to overflow the temporary trash buffer. The problem happens when doing "regsub(match,replacement,g)": we're replacing every occurrence of "match" with "replacement" in the input sample, which requires a length check. For this, a max is applied, so that a replacement may not use more than the remaining length in the buffer. However, the length check is made on the replaced pattern and not on the temporary buffer used to carry the new string. This results in the remaining size to be usable for each input match, which can go beyond the temporary buffer size if more than one occurrence has to be replaced with something that's larger than the remaining room.

These are all security issues fixed in the haproxy-3.2.0+git0.e134140d2-2.1 package on the GA media of openSUSE Tumbleweed.

This update for haproxy fixes the following issues:

• CVE-2025-32464: Fixed heap-based buffer overflow in sample_conv_regsub. (bsc#1240971)

This update for haproxy fixes the following issues:

• CVE-2025-32464: Fixed heap-based buffer overflow in sample_conv_regsub. (bsc#1240971)

Aleandro Prudenzano and Edoardo Geraci discovered that HAProxy incorrectly handled certain uncommon configurations that replace multiple short patterns with a longer one. A remote attacker could use this issue to cause HAProxy to crash, resulting in a denial of service, or possibly execute arbitrary code.

USN-7431-1 fixed a vulnerability in HAProxy. This update provides the corresponding update for Ubuntu 25.04.

Original advisory details:

Aleandro Prudenzano and Edoardo Geraci discovered that HAProxy incorrectly handled certain uncommon configurations that replace multiple short patterns with a longer one. A remote attacker could use this issue to cause HAProxy to crash, resulting in a denial of service, or possibly execute arbitrary code.