glibc v2.2+ OOB Write via Deprecated DNS Print Functions
CVE-2026-5435 Published on April 28, 2026
Potential buffer overflow in ns_sprintrrf TSIG handling path
The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.
Vulnerability Analysis
CVE-2026-5435 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-5435 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-5435
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Affected Versions
The GNU C Library glibc:- Version 2.2, <= * is affected.