جزئیات آسیب‌پذیری
CVE-2026-42944
Heap overflow with multiple NSID, COOKIE, PADDING EDNS options
شرح رسمی (انگلیسی)
NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.
امتیازهای CVSS
| امتیاز | نسخه | منبع | بردار |
|---|---|---|---|
| 8.7بالا | 4.0 | CVEProject cvelistV5 (CNA) (NLnet Labs) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red |
| 7.5بالا | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
محصولات آسیب‌پذیر
| فروشنده | محصول | نسخه‌ها | منبع |
|---|---|---|---|
| NLnet Labs | Unbound | 1.14.0 ≤ v < 1.25.1 | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 6 | همه | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 7 | همه | CVEProject cvelistV5 (CNA) |
منابع و راهنماها
۸- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-42944 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2479774 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42944.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:23231 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24365 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24369 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:19752 vendor-advisoryx_refsource_REDHAT
اطلاعات
- تاریخ انتشار
- ۱۴۰۵/۰۲/۳۰
- آخرین به‌روزرسانی
- ۱۴۰۵/۰۶/۰۴
- وضعیت
- منتشرشده
- صادرکننده (CNA)
- NLnet Labs
پیش‌بینی بهره‌برداری (EPSS)
ارزیابی SSVC (CISA)
- قابل خودکارسازی
- بله
- وضعیت بهره‌برداری
- ندارد
- اثر فنی
- جزئی
ضعف‌ها (CWE)
- CWE-787Out-of-bounds Write
- CWE-197Numeric Truncation Error
- CWE-131Incorrect Calculation of Buffer Size