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 in the GNU C Library (glibc) due to improper bounds checking in deprecated functions ns_printrrf, ns_printrr, and fp_nquery. These functions fail to enforce the length of the buffer provided by the caller when printing TSIG records, which can cause memory corruption. The issue affects glibc version 2.2 and newer. No patch or official remediation has been confirmed at this time.
Potential Impact
Successful exploitation can lead to an out-of-bounds write, potentially causing data corruption, denial of service, or arbitrary code execution. The CVSS score of 7.3 reflects a high severity with network attack vector, no privileges required, and impacts on confidentiality, integrity, and availability.
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 risk. Monitor official GNU C Library advisories for updates and apply any forthcoming patches promptly.
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.
CVSS v3.1
Score 7.3high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-5435 involves an out-of-bounds write in the GNU C Library (glibc) due to improper bounds checking in deprecated functions ns_printrrf, ns_printrr, and fp_nquery. These functions fail to enforce the length of the buffer provided by the caller when printing TSIG records, which can cause memory corruption. The issue affects glibc version 2.2 and newer. No patch or official remediation has been confirmed at this time.
Potential Impact
Successful exploitation can lead to an out-of-bounds write, potentially causing data corruption, denial of service, or arbitrary code execution. The CVSS score of 7.3 reflects a high severity with network attack vector, no privileges required, and impacts on confidentiality, integrity, and availability.
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 risk. Monitor official GNU C Library advisories for updates and apply any forthcoming patches promptly.
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: 04/28/2026, 13:08:02 UTC
Last enriched: 07/15/2026, 11:24:26 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 109
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