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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2026-29628

MEDIUM · 6.2 CVSS v3.1 Published 2026-04-13
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
67/100
Remediation priority · Elevated
No privileges Zero-click Patch available

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
A stack overflow in the experimental/tinyobj_loader_opt.h file of tinyobjloader commit d56555b allows attackers to cause a Denial of Service (DoS) via supplying a crafted .mtl 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
How this class of weakness works · CWE-121

Data overflows a fixed-size buffer allocated on the stack, overwriting adjacent stack memory — including saved return addresses — which is the classic route to redirecting execution into attacker-supplied code. Crafted input is all it takes. Remediation is strict length checks, safe bounded string and memory functions, and modern stack-protection mitigations.

General guidance for the stack-based buffer overflow class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Local
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Upgrade to the latest stable release of tinyobjloader that incorporates the fix from commit 386b73bb (or subsequent releases). Check https://github.com/tinyobjloader/tinyobjloader/releases for the most recent version.

  1. 1. Identify the current version of tinyobjloader in use by checking your project dependencies or source files
  2. 2. Navigate to the official tinyobjloader repository at https://github.com/tinyobjloader/tinyobjloader
  3. 3. Check the commits/RELEASE notes to identify if the fix from commit 386b73bb8c1a855236beb73b11f45f7feac4e03a has been merged into the main branch
  4. 4. If the fix is available in the main branch, upgrade to the latest stable release that includes this patch
  5. 5. Rebuild and redeploy your application with the updated tinyobjloader library
  6. 6. Test your application with various .mtl files to ensure the vulnerability is remediated and no regressions were introduced
Caveat Minor: As this is a bug fix for a security vulnerability, breaking changes are unlikely. However, verify release notes for any API changes if upgrading across multiple version jumps.

Generated from the published advisory — verify against the referenced sources before acting.

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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-2026-29628 in production — separate from our analysis above.

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