CVE-2006-5876
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 · uneditedThe soup_headers_parse function in soup-headers.c for libsoup HTTP library before 2.2.99 allows remote attackers to cause a denial of service (crash) via malformed HTTP headers, probably involving missing fields or values.
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 · high confidenceThe libsoup HTTP library before version 2.2.99 contains a vulnerability in the soup_headers_parse function in soup-headers.c. The function fails to properly handle malformed HTTP headers with missing fields or values, causing the application to crash. This results in a denial of service condition when processing specially crafted HTTP responses.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2.2.98CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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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Query installed libsoup versionRun 'pkg-config --modversion libsoup-2.2' on Linux or check the libsoup DLL file version on Windows. On RPM-based systems: 'rpm -q libsoup'. On Debian-based: 'dpkg -l libsoup2.2' or 'apt show libsoup2.2'.Affected if The installed version is exactly 2.2.98
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Verify libsoup library presenceSearch for libsoup shared library files: 'find /usr -name "libsoup*" 2>/dev/null' on Linux or check the application directory for libsoup DLLs on Windows.Affected if libsoup library files exist and the application depends on them for HTTP handling
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Identify if application uses soup_headers_parseReview application source code for calls to soup_headers_parse or soup_header_* functions. Alternatively, use 'ldd <application_binary>' on Linux to confirm dynamic linking to libsoup, or check import tables on Windows.Affected if The application dynamically or statically links to libsoup and processes HTTP headers
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Determine if application processes external HTTP responsesExamine application logs, configuration, or source code to confirm it receives HTTP responses from network sources, remote services, or untrusted clients that could supply malformed headers.Affected if The application processes HTTP responses from network sources using libsoup
You are affected if your system has libsoup version 2.2.98 AND your application uses libsoup to process HTTP responses from external 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 dataUpgrade libsoup to version 2.2.99 or later to obtain the patched soup_headers_parse function. For systems where upgrading is not feasible, implement input validation at the application layer to reject malformed HTTP headers before passing them to libsoup.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2006-5876 — 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-2006-5876 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
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