Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N (CVE-2026-76651) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-76651

Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N

Answer in brief

CVE-2026-76651 records a Unknown severity vulnerability in Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N. The current sources do not mark it as known exploited. The current feed maps TP-Link System Inc./TL-WR841N v14 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TP-Link System Inc./TL-WR841N v14 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TP-Link System Inc./TL-WR841N v14generic	>=0 <TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478 \|\| >=0 <TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588	TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478, TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588

Recommended response

Check inventory. Check lockfiles and deployed manifests for TP-Link System Inc./TL-WR841N v14.
Review the reported fix. Update TP-Link System Inc./TL-WR841N v14 to TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

A buffer overflow vulnerability exists in the embedded HTTP service in TL-WR841N v14 when processing multipart/form-data requests. Insufficient validation of an attacker-controlled boundary parameter may allow a remote unauthenticated attacker to submit a crafted request that corrupts memory by overwriting data beyond the bounds of an internal buffer. Successful exploitation may result in modification or corruption of process memory, potentially leading to undefined application behavior. Arbitrary code execution, information disclosure, and denial-of-service conditions have not been demonstrated.

Quoted source text, attributed separately from HOL analysis.