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NVD / CVE Program· CNA CERT-PL

CVE-2026-16599: Denial of Service in GNU wget

Noroxi assessment

Priority: Monitor (action score 20/100)

  • 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: 0.37% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: wget (openSUSE:Leap 16.0) 1.25.0-160000.4.1; wget (openSUSE:Tumbleweed) 1.25.0-7.1; wget (SUSE:Linux Enterprise Micro 5.5) 1.20.3-150000.3.40.1.

Low priority for now. Upgrade to wget (openSUSE:Leap 16.0) 1.25.0-160000.4.1; wget (openSUSE:Tumbleweed) 1.25.0-7.1; wget (SUSE:Linux Enterprise Micro 5.5) 1.20.3-150000.3.40.1 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

GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation. This issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa

MediumCVSS 5.1 · v4.0—No exploit Fix available
Published
Aug 25, 2026
Updated
Aug 28, 2026
EPSS
0.3% · 31th percentile

Report tools

JSON

Action score

20

Monitor

Low priority for now.

CVSS
20 / 40 · 5.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · CERT-PL
5.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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-2026-16599

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

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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.

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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 (CERT-PL). Independent of NVD's CPE analysis and usually ahead of it.

  • GNU wget

    • up to and including 1.25.0affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12wgetfrom 0—
openSUSE:Leap 16.0wgetbefore 1.25.0-160000.4.11.25.0-160000.4.1
openSUSE:Tumbleweedwgetbefore 1.25.0-7.11.25.0-7.1
SUSE:Linux Enterprise Micro 5.5wgetbefore 1.20.3-150000.3.40.11.20.3-150000.3.40.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7wgetbefore 1.24.5-150700.3.12.11.24.5-150700.3.12.1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5wgetbefore 1.14-21.31.11.14-21.31.1
SUSE:Linux Micro 6.0wgetbefore 1.24.5-5.11.24.5-5.1
SUSE:Linux Micro 6.1wgetbefore 1.24.5-slfo.1.1_6.11.24.5-slfo.1.1_6.1
SUSE:Linux Micro 6.2wgetbefore 1.25.0-160000.4.11.25.0-160000.4.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-13089GNU Wget: stack overflow in HTTP protocol handling
    59Plan
  • CVE-2016-4971GNU wget before 1.18 allows remote servers to write to arbitrary files by redirecting a request from HTTP to a crafted FTP resource.
    49Plan
  • CVE-2014-4877Absolute path traversal vulnerability in GNU Wget before 1.16, when recursion is enabled, allows remote FTP servers to write to arbitrary fi
    49Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-58470Jul 7, 2026 · GNU Wget 1.25.0 Integer Overflow via Content-Range Header Parsing
    27Monitor
  • ← EarlierCVE-2026-58471Jul 7, 2026 · GNU Wget 1.25.0 Heap Buffer Overflow via convert_fname() in url.c
    24Monitor
  • ← EarlierCVE-2026-58472Jul 7, 2026 · GNU Wget 1.25.0 Heap Buffer Overflow via HTML Attribute Encoding
    24Monitor

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
opensuse:wget1.25.0-7.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:wget1.24.5-5.1 · SUSE:Linux Micro 6.0Package 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.

No nightly-computed relations.

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 special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
A
Scope
X

Weakness class (CWE)

CWE-606 · Unchecked Input for Loop Condition

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records