Stack disclosure via uninitialized DNS query buffer
Published Jan 15, 2026 · Updated Jan 15, 2026
Information disclosure in glibc 2.0 through 2.42 allows attackers to leak nearby stack bytes through a zero-valued network lookup. The _nss_dns_getnetbyaddr_r function leaves qbuf uninitialized when net is zero, then sends those bytes unchanged as the DNS query name. Exposure requires the DNS networks backend, a caller-supplied zero network value, and adjacent access to observe traffic between the host and resolver.
Summary
What happened
Information disclosure in glibc 2.0 through 2.42 allows attackers to leak nearby stack bytes through a zero-valued network lookup. The _nss_dns_getnetbyaddr_r function leaves qbuf uninitialized when net is zero, then sends those bytes unchanged as the DNS query name. Exposure requires the DNS networks backend, a caller-supplied zero network value, and adjacent access to observe traffic between the host and resolver.
The record
- CVE
- CVE-2026-0915
- Published
- Jan 15, 2026
- Updated
- Jan 15, 2026
- Vendor
- The GnuPG Project
- Product
- glibc
- Classifications
- CWE-908, T1040
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 15, 2026CVE publishedPublication date reported by the CVE source.
- Jan 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.0 <=2.42
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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