Red Hat Enterprise Linux Filesignatures hex2binv buffer overflow

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux and classified as very critical. Affected is the function hex2binv of the component Filesignatures. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2026-103242. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux (the affected version is unknown). It has been declared as very critical. This vulnerability affects the function hex2binv of the component Filesignatures. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte buffer and then write the tag's attacker-controlled, hex-decoded content — of attacker-chosen length — past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2026-103242 since 09/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/30/2026).

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

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Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

License

• commercial

Website

• Vendor: https://www.redhat.com/

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