CVE-2026-38641
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn issue in the DSO::mmap_and_copy function of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via loading a crafted shared library.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA denial of service vulnerability exists in the DSO::mmap_and_copy function of relibc (commit 61f42d). Attackers can trigger the vulnerability by loading a crafted malicious shared library, causing the application to become unavailable.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if relibc is in useCheck for relibc presence in the system by searching for relibc-related files, libraries, or dependencies. Look for librelibc or similar library files, or check build/system dependencies.Affected if relibc is present and the application loads shared libraries from untrusted sources
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Determine the relibc version or commitCheck the installed relibc version or git commit hash. If built from source, review the commit history for commit 61f42d. Look for version tags or build metadata that indicates the source revision.Affected if The installed version is at commit 61f42d or earlier (before the fix for this vulnerability)
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Verify the vulnerable function existsInspect the relibc source code or binary for the DSO::mmap_and_copy function. Search for this symbol in any linked relibc library or source tree.Affected if The DSO::mmap_and_copy function is present in the installed relibc version
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Check shared library loading behaviorMonitor or audit the application's shared library loading behavior. Determine if the application loads libraries from directories writable by untrusted users or from untrusted network sources.Affected if The application loads shared libraries from untrusted or unknown sources
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Review application library pathsExamine the application's LD_LIBRARY_PATH, RPATH/RUNPATH settings, and any configuration that specifies where shared libraries are loaded from.Affected if Library paths include untrusted or user-controlled directories
A system is affected if it uses relibc at commit 61f42d or earlier AND loads shared libraries from untrusted or unknown sources.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataAvoid loading shared libraries from untrusted or unknown sources. If a patched version is available, upgrade to the fixed release. Consider implementing library loading validation and monitoring.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-38641 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-38641 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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