EUVD-2026-82326
GHSA-qghr-qhfc-4hxp
Severity by source
AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:A and AC:H because exploitation relies on adjacent-network DHCP/VPN config that is subject to validation by network software; PR:N/UI:N as no target privileges are needed; A:H for full loss of the aborted process, C/I:N.
Primary rating from Vendor (glibc).
CVSS VectorVendor: glibc
Lifecycle Timeline
2DescriptionCVE.org
Initializing the DNS stub resolver from an /etc/resolv.conf file, or a LOCALDOMAIN environment variable, whose search list contains a domain of roughly 200 characters or more in the GNU C Library version 2.26 to 2.44 results in an assertion failure which aborts the process.
The resolver truncates the search list when copying it into the fixed-size _res.defdname buffer, then asserts that the copy is consistent with the full configuration. The consistency check compared against the wrong size and did not handle a first entry that does not fit, so a correctly truncated list failed the assertion. Any process that resolves names through the library is affected, including long-running processes that reload /etc/resolv.conf on the next query after it changes. Search domains are commonly written to /etc/resolv.conf from data received over DHCP or from a VPN server, so an attacker on the local network may be able to trigger this without privileges on the target system, subject to validation by the network configuration software.
AnalysisAI
Denial of service in the GNU C Library (glibc) DNS stub resolver causes any process that resolves names to abort via an assertion failure when the search list loaded from /etc/resolv.conf or the LOCALDOMAIN environment variable contains a single domain of roughly 200 characters or more; affected versions are 2.26 through 2.44. The weakness is reachable by an unauthenticated attacker on the adjacent network (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H, score 5.3) only where search domains are populated from attacker-influenced DHCP or VPN configuration and the network-configuration software does not reject the over-length value; local exploitation requires the ability to write /etc/resolv.conf or set LOCALDOMAIN. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the glibc DNS stub resolver to initialize from an /etc/resolv.conf file or a LOCALDOMAIN environment variable whose search list contains a single domain of roughly 200 characters or more; affected glibc versions 2.26 through 2.44. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but bounded availability issue, not a high-priority emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor patch: apply the upstream fix from the GNU C Library advisory GLIBC-SA-2026-0021 (sourceware bugzilla 31026), which corresponds to commit 506ea57086bfb9ce3daff1c14246a1cb532aba0a; because this is a library flaw, the practical action is to upgrade to a glibc build from your distribution that includes this commit, or to install the distribution's backported update, and then restart long-running services so they pick up the new library. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
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External POC / Exploit Code
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