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LibnsgifApplication · Netsurf Browser

CVE-2015-7506

MEDIUM · 6.5 CVSS v3.1 Published 2020-02-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
The gif_next_LZW function in libnsgif.c in Libnsgif 0.1.2 allows context-dependent attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted LZW stream in a GIF file.

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 confidence

Out-of-bounds read vulnerability in the gif_next_LZW function in libnsgif 0.1.2 allows attackers to cause a denial of service via crafted LZW stream in a malicious GIF file.

MitigationUpgrade libnsgif to a patched version or apply vendor-provided fix; implement input validation on LZW stream data before processing.

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
LibnsgifApplication
Affected:= 0.1.2

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
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 checks

Work through these to decide whether this CVE applies to you.

  1. Locate libnsgif library in your environment
    Search for files named libnsgif or nsgif, or check your application's dependency list for libnsgif presence
    Affected if libnsgif library is found and linked to your application
  2. Identify installed libnsgif version
    Run version detection command for your package manager (dpkg -l, rpm -qa, or check library version via file command) or inspect library metadata
    Affected if Installed version is exactly 0.1.2
  3. Confirm GIF processing capability
    Check if your application or any component processes GIF image files using libnsgif
    Affected if GIF files are processed by the vulnerable library version
  4. Verify gif_next_LZW function is accessible
    Inspect libnsgif binary/symbol table for gif_next_LZW function presence
    Affected if The gif_next_LZW function symbol exists in the library

You are affected if libnsgif version 0.1.2 is installed and your environment processes GIF files using this library, as the out-of-bounds read occurs in the gif_next_LZW function when parsing malicious LZW stream data.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade libnsgif to a patched version or apply vendor-provided fix; implement input validation on LZW stream data before processing.

Fix this in Libnsgif Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2015-7506 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data