Skip to content
Noroxi
NVD / CVE Program· CNA redhat

CVE-2026-85234: Tftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.47% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: tftp (AlmaLinux:10) 5.2-50.el10_2; tftp-server (AlmaLinux:10) 5.2-50.el10_2; tftp (AlmaLinux:8) 5.2-28.el8_10.

Low priority for now. Upgrade to tftp (AlmaLinux:10) 5.2-50.el10_2; tftp-server (AlmaLinux:10) 5.2-50.el10_2; tftp (AlmaLinux:8) 5.2-28.el8_10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 15, 2026
Updated
Nov 6, 2026
EPSS
0.4% · 40th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-85234

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for red hat records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • 0:5.2-50.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • 0:5.2-28.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 9

    • 0:5.2-40.el9_8.1 and laternot affected · rpm

  • Red Hat Red Hat Hardened Images

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10tftpbefore 5.2-50.el10_25.2-50.el10_2
AlmaLinux:10tftp-serverbefore 5.2-50.el10_25.2-50.el10_2
AlmaLinux:8tftpbefore 5.2-28.el8_105.2-28.el8_10
AlmaLinux:8tftp-serverbefore 5.2-28.el8_105.2-28.el8_10
AlmaLinux:9tftpbefore 5.2-40.el9_8.15.2-40.el9_8.1
AlmaLinux:9tftp-serverbefore 5.2-40.el9_8.15.2-40.el9_8.1
Debian:12tftp-hpafrom 0—
Debian:14tftp-hpabefore 5.3+20251116-15.3+20251116-1
openSUSE:Tumbleweedtftpbefore 5.4-1.15.4-1.1
Red Hat:enterprise_linux:10.2tftpbefore 0:5.2-50.el10_20:5.2-50.el10_2
Red Hat:enterprise_linux:10.2tftp-debuginfobefore 0:5.2-50.el10_20:5.2-50.el10_2
Red Hat:enterprise_linux:10.2tftp-debugsourcebefore 0:5.2-50.el10_20:5.2-50.el10_2
Red Hat:enterprise_linux:10.2tftp-serverbefore 0:5.2-50.el10_20:5.2-50.el10_2
Red Hat:enterprise_linux:10.2tftp-server-debuginfobefore 0:5.2-50.el10_20:5.2-50.el10_2
Red Hat:enterprise_linux:8::appstreamtftpbefore 0:5.2-28.el8_100:5.2-28.el8_10
Red Hat:enterprise_linux:8::appstreamtftp-debuginfobefore 0:5.2-28.el8_100:5.2-28.el8_10
Red Hat:enterprise_linux:8::appstreamtftp-debugsourcebefore 0:5.2-28.el8_100:5.2-28.el8_10
Red Hat:enterprise_linux:8::appstreamtftp-serverbefore 0:5.2-28.el8_100:5.2-28.el8_10
Red Hat:enterprise_linux:8::appstreamtftp-server-debuginfobefore 0:5.2-28.el8_100:5.2-28.el8_10
Red Hat:enterprise_linux:9::appstreamtftpbefore 0:5.2-40.el9_8.10:5.2-40.el9_8.1
Red Hat:enterprise_linux:9::appstreamtftp-debuginfobefore 0:5.2-40.el9_8.10:5.2-40.el9_8.1
Red Hat:enterprise_linux:9::appstreamtftp-debugsourcebefore 0:5.2-40.el9_8.10:5.2-40.el9_8.1
Red Hat:enterprise_linux:9::appstreamtftp-serverbefore 0:5.2-40.el9_8.10:5.2-40.el9_8.1
Red Hat:enterprise_linux:9::appstreamtftp-server-debuginfobefore 0:5.2-40.el9_8.10:5.2-40.el9_8.1

+3

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-90994Sep 14, 2026 · Sssd: sssd: denial of service via malformed pam v1 requests
    16Monitor
  • ← EarlierCVE-2026-91786Sep 15, 2026 · Gnome-shell: gnome-shell: out-of-bounds read in remote search icon rendering due to unvalidated icon-data buffer size
    24Monitor
  • Later →CVE-2026-86320Sep 17, 2026 · Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:tftp5.2-28.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:tftp-server5.2-28.el8_10 · AlmaLinux:8Package registry (OSV)
debian:tftp-hpa5.3+20251116-1 · Debian:14Package registry (OSV)
opensuse:tftp5.4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:tftp0:5.2-28.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:tftp-debuginfo0:5.2-28.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:tftp-debugsource0:5.2-28.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:tftp-server0:5.2-28.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:tftp-server-debuginfo0:5.2-28.el8_10 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:tftp0:5.2-28.el8_10 · Rocky Linux:8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-49796456 days apartLibxml: type confusion leads to denial of service (dos)
    36Monitor
  • CVE-2026-11961055 days apartGstreamer1-plugins-good: gstreamer1-plugins-good: out-of-bounds heap read in mtap16/mtap24 h.264 rtp depayloader via signed/unsigned underflow
    32Monitor
  • CVE-2026-34003145 days apartXorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
    31Monitor
  • CVE-2026-11548438 days apartOpen-iscsi: open-iscsi: dhcpv4 option parser heap out-of-bounds read in iscsiuio parse_msg
    30Monitor
  • CVE-2025-11021354 days apartLibsoup: out-of-bounds read in cookie date handling of libsoup http library
    30Monitor
  • CVE-2025-32906519 days apartLibsoup: out of bounds reads in soup_headers_parse_request()
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records