A flaw was found in tftp-hpa. When the in.tftpd remap engine processes an inverse remap rule that also aborts with a non-empty custom error message,… (CVE-2026-85234)
A vulnerability in tftp-hpa's in.tftpd remap engine allows out-of-bounds read/write operations when processing an inverse remap rule with a non-empty custom error message. This flaw can be triggered remotely without authentication by sending a crafted request, causing the daemon to crash and resulting in a denial of service.
AI Analysis
Technical Summary
The tftp-hpa software contains a flaw in the in.tftpd remap engine. Specifically, when processing an inverse remap rule that aborts with a non-empty custom error message, invalid match offsets may be passed to the genmatchstring() function. This leads to out-of-bounds read/write operations. A remote unauthenticated attacker can exploit this by sending a specially crafted request, causing the tftp daemon to crash and resulting in denial of service.
Potential Impact
Exploitation of this vulnerability results in a denial of service due to the tftp daemon crashing. There is no indication of confidentiality or integrity impact. The attack can be performed remotely without authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
A flaw was found in tftp-hpa. When the in.tftpd remap engine processes an inverse remap rule that also aborts with a non-empty custom error message,… (CVE-2026-85234)
Description
A vulnerability in tftp-hpa's in.tftpd remap engine allows out-of-bounds read/write operations when processing an inverse remap rule with a non-empty custom error message. This flaw can be triggered remotely without authentication by sending a crafted request, causing the daemon to crash and resulting in a denial of service.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/tftp-hpa?arch=source&distro=trustypkg:deb/ubuntu/tftp-hpa?arch=source&distro=xenialpkg:deb/ubuntu/tftp-hpa?arch=source&distro=bionicpkg:deb/ubuntu/tftp-hpa?arch=source&distro=focalpkg:deb/ubuntu/tftp-hpa?arch=source&distro=jammypkg:deb/ubuntu/tftp-hpa?arch=source&distro=noblepkg:deb/ubuntu/tftp-hpa?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The tftp-hpa software contains a flaw in the in.tftpd remap engine. Specifically, when processing an inverse remap rule that aborts with a non-empty custom error message, invalid match offsets may be passed to the genmatchstring() function. This leads to out-of-bounds read/write operations. A remote unauthenticated attacker can exploit this by sending a specially crafted request, causing the tftp daemon to crash and resulting in denial of service.
Potential Impact
Exploitation of this vulnerability results in a denial of service due to the tftp daemon crashing. There is no indication of confidentiality or integrity impact. The attack can be performed remotely without authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-85234
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:14.04:LTS","Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab4be46f7a7c54106f047f8
Added to database: 09/24/2026, 06:08:06 UTC
Last enriched: 09/24/2026, 06:42:01 UTC
Last updated: 09/24/2026, 06:42:01 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.