High
tftp-hpa — security advisory
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, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.
- Products
- tftp-hpa
- Affected versions
- 5.2+20140608-3ubuntu1, 5.2+20150808-1.2build1, 5.2+20150808-1.2build2, 5.2+20150808-1.4, 5.2+20150808-1.4build1, 5.2+20150808-1ubuntu1, 5.2+20150808-1ubuntu1.16.04.1, 5.2+20150808-1ubuntu3, 5.2+20150808-1ubuntu4, 5.2+20240610-3, 5.2-7ubuntu3, 5.2-7ubuntu3.1, 5.3+20251110-1, 5.3+20251116-1, 5.3+20251209-1, 5.3+20251209-2, 5.4-1, 5.4-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-85234
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:23 UTC · Revision 1
Source evidence
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, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.
osv:UBUNTU-CVE-2026-85234
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
tftp-hpa
Fixed versions: Not specified
Complete source record
{
"id": "000128faa85c764da5cdad5a73c4ae735adab0c8bc764c2fc75427502cb005b7",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-85234",
"method": "structured",
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"summary": "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, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.",
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"modified": "2026-10-17T13:01:13.414329177Z",
"provider": "osv",
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"source_id": "core-osv",
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"published_at": "2026-09-15T18:19:00+00:00"
}