CVE-2026-5435: CWE-787 Out-of-bounds write in The GNU C Library glibc
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-5435 involves an out-of-bounds write (CWE-787) in the GNU C Library's deprecated functions ns_printrrf, ns_printrr, and fp_nquery. These functions do not properly enforce the length of the buffer provided by the caller when printing TSIG records, which can cause writes beyond the allocated buffer boundaries. This affects glibc starting from version 2.2. No patch or official remediation information is currently available, and no CVSS score has been assigned.
Potential Impact
The out-of-bounds write can lead to memory corruption, which may cause application crashes or potentially enable arbitrary code execution if exploited. However, the affected functions are deprecated, and no known exploits have been reported. The impact is limited to software using these specific deprecated functions in glibc.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the affected functions are deprecated, avoiding their use may reduce exposure. Monitor official GNU C Library advisories for updates or patches addressing this vulnerability.
CVE-2026-5435: CWE-787 Out-of-bounds write in The GNU C Library glibc
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-5435 involves an out-of-bounds write (CWE-787) in the GNU C Library's deprecated functions ns_printrrf, ns_printrr, and fp_nquery. These functions do not properly enforce the length of the buffer provided by the caller when printing TSIG records, which can cause writes beyond the allocated buffer boundaries. This affects glibc starting from version 2.2. No patch or official remediation information is currently available, and no CVSS score has been assigned.
Potential Impact
The out-of-bounds write can lead to memory corruption, which may cause application crashes or potentially enable arbitrary code execution if exploited. However, the affected functions are deprecated, and no known exploits have been reported. The impact is limited to software using these specific deprecated functions in glibc.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the affected functions are deprecated, avoiding their use may reduce exposure. Monitor official GNU C Library advisories for updates or patches addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- glibc
- Date Reserved
- 2026-04-02T17:18:02.654Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f0b132cbff5d86100ea24c
Added to database: 4/28/2026, 1:08:02 PM
Last enriched: 4/28/2026, 1:22:56 PM
Last updated: 4/29/2026, 6:10:50 AM
Views: 6
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