Red Hat libsoup Multipart Processing soup-multipart-input-stream.c soup_multipart_input_stream_read_headers boundary out-of-bounds

Summaryinfo

A vulnerability was found in Red Hat libsoup. It has been rated as critical. The impacted element is the function soup_multipart_input_stream_read_headers of the file soup-multipart-input-stream.c of the component Multipart Processing. The manipulation of the argument boundary leads to out-of-bounds. This vulnerability is documented as CVE-2026-15714. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Red Hat libsoup (version unknown). This issue affects the function soup_multipart_input_stream_read_headers of the file soup-multipart-input-stream.c of the component Multipart Processing. The manipulation of the argument boundary with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-15714 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/15/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Red Hat

Name

• libsoup

License

• open-source

Website

• Vendor: https://www.redhat.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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