Threats Tagged 'cve-2026-56392'

A stack buffer overflow vulnerability (CVE-2025-6170) exists in the libxml2 library's xmllint interactive shell command handling on Red Hat Enterprise Linux 8 and related products. Red Hat has rated the security impact as low. A security update is available that addresses this vulnerability by updating the libxml2 package. No known exploits are reported in the wild.

This release of the Red Hat OpenShift distributed tracing platform (Tempo) provides security improvements. Breaking changes: * None Deprecations: * None Technology Preview features: * None Enhancements: * None Bug fixes: * Punycode labels are no longer processed incorrectly: Before this update, the golang.org/x/net/idna package incorrectly processed certain Punycode labels during internationalized domain name conversion. As a consequence, an attacker could craft a domain name that resolved to a different host than the one that was validated, which could lead to privilege escalation. With this update, Punycode labels are processed correctly. As a result, converted domain names match the validated input. For more information, see https://access.redhat.com/security/cve/cve-2026-39821. * The os.Root type no longer follows symbolic links outside of its root: Before this update, the Go os package did not correctly restrict some operations performed through an os.Root value. As a consequence, an attacker who controlled a symbolic link inside the root directory could traverse outside of it and access files elsewhere on the file system. With this update, operations on an os.Root value are correctly confined to the root directory. As a result, symbolic links can no longer be used to escape the root. For more information, see https://access.redhat.com/security/cve/cve-2026-39822. * The ungetwc function no longer mishandles specific wide character encodings: Before this update, the ungetwc function in the GNU C Library mishandled certain wide character encodings. As a consequence, an application could disclose information or terminate unexpectedly. With this update, the wide character encodings are handled correctly. As a result, the affected applications no longer disclose information or crash. For more information, see https://access.redhat.com/security/cve/cve-2026-5928. * TSIG record processing no longer writes outside the allocated buffer: Before this update, the DNS resolver in the GNU C Library did not correctly validate buffer boundaries when it processed TSIG records. As a consequence, a crafted TSIG record could trigger an out-of-bounds write and cause memory corruption. With this update, the buffer boundaries are validated correctly. As a result, TSIG record processing no longer writes outside the allocated buffer. For more information, see https://access.redhat.com/security/cve/cve-2026-5435. * Crafted DNS responses no longer cause a crash or an uninitialized memory read: Before this update, the DNS resolver in the GNU C Library did not correctly handle malformed responses. As a consequence, a crafted DNS response could cause an application to read uninitialized memory or terminate unexpectedly. With this update, malformed responses are handled correctly. As a result, the affected applications no longer crash or read uninitialized memory. For more information, see https://access.redhat.com/security/cve/cve-2026-6238. Known issues: * None

This release of the Red Hat OpenShift distributed tracing platform (Tempo) provides security improvements. Breaking changes: * None Deprecations: * None Technology Preview features: * None Enhancements: * None Bug fixes: * Punycode labels are no longer processed incorrectly: Before this update, the golang.org/x/net/idna package incorrectly processed certain Punycode labels during internationalized domain name conversion. As a consequence, an attacker could craft a domain name that resolved to a different host than the one that was validated, which could lead to privilege escalation. With this update, Punycode labels are processed correctly. As a result, converted domain names match the validated input. For more information, see https://access.redhat.com/security/cve/cve-2026-39821. * The os.Root type no longer follows symbolic links outside of its root: Before this update, the Go os package did not correctly restrict some operations performed through an os.Root value. As a consequence, an attacker who controlled a symbolic link inside the root directory could traverse outside of it and access files elsewhere on the file system. With this update, operations on an os.Root value are correctly confined to the root directory. As a result, symbolic links can no longer be used to escape the root. For more information, see https://access.redhat.com/security/cve/cve-2026-39822. * The ungetwc function no longer mishandles specific wide character encodings: Before this update, the ungetwc function in the GNU C Library mishandled certain wide character encodings. As a consequence, an application could disclose information or terminate unexpectedly. With this update, the wide character encodings are handled correctly. As a result, the affected applications no longer disclose information or crash. For more information, see https://access.redhat.com/security/cve/cve-2026-5928. * TSIG record processing no longer writes outside the allocated buffer: Before this update, the DNS resolver in the GNU C Library did not correctly validate buffer boundaries when it processed TSIG records. As a consequence, a crafted TSIG record could trigger an out-of-bounds write and cause memory corruption. With this update, the buffer boundaries are validated correctly. As a result, TSIG record processing no longer writes outside the allocated buffer. For more information, see https://access.redhat.com/security/cve/cve-2026-5435. * Crafted DNS responses no longer cause a crash or an uninitialized memory read: Before this update, the DNS resolver in the GNU C Library did not correctly handle malformed responses. As a consequence, a crafted DNS response could cause an application to read uninitialized memory or terminate unexpectedly. With this update, malformed responses are handled correctly. As a result, the affected applications no longer crash or read uninitialized memory. For more information, see https://access.redhat.com/security/cve/cve-2026-6238. Known issues: * None

Red Hat Cost Management On-Premise provides cost visibility and analysis for on-premise OpenShift environments. This update includes the latest bug fixes and enhancements.

Multiple high-severity security vulnerabilities have been identified in PostgreSQL, affecting various components such as tsvector and tsquery functions, psql COPY FROM STDIN, logical decoding plugins, and others. These vulnerabilities include arbitrary code execution, privilege escalation, and information disclosure. Red Hat has issued security advisories and updates addressing these issues for affected Red Hat Enterprise Linux versions, including Red Hat Update Infrastructure 5.3. The vulnerabilities impact critical database operations and require applying the provided updates.

Red Hat has issued a security advisory addressing vulnerabilities in the GNU coreutils package, specifically affecting the uniq and unexpand utilities. The uniq utility suffers from a denial of service and information disclosure vulnerability due to an out-of-bounds read with multibyte input (CVE-2026-56391). The unexpand utility is vulnerable to denial of service through crafted tab stop values (CVE-2026-56392). Updated coreutils packages have been released to mitigate these issues.

GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d

GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d

A security update has been issued for Red Hat Hardened Images RPMs, including Perl packages, addressing vulnerabilities such as CVE-2026-13221. The advisory indicates a high severity level but does not provide detailed technical specifics or CVSS scores. The update targets multiple affected versions of Red Hat Update Infrastructure container images to mitigate security issues.