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CVE-2018-6196· NVD / CVE Program· CNA mitre

w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prev

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 2.9% (FIRST EPSS); higher than 86.7% of all records.
  • 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.
  • Fixed version: w3m (Alpine:v3.23) 0.5.3_git20241203-r0; w3m (Debian:12) 0.5.3-36; w3m (Debian:8) 0.5.3-19+deb8u3.

Low priority for now. Upgrade to w3m (Alpine:v3.23) 0.5.3_git20241203-r0; w3m (Debian:12) 0.5.3-36; w3m (Debian:8) 0.5.3-19+deb8u3 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

w3m through 0.5.3 is prone to an infinite recursion flaw in HTMLlineproc0 because the feed_table_block_tag function in table.c does not prevent a negative indent value.

HighCVSS 7.5 · v3.0—No exploit Fix available
Published
Jan 24, 2018
Updated
Jun 16, 2026
EPSS
2.9% · 87th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.9%

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.

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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.

VendorProduct
tatsw3m
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux17.10
  • tats w3mup to 0.5.3 inclusive

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.23w3mbefore 0.5.3_git20241203-r00.5.3_git20241203-r0
Debian:12w3mbefore 0.5.3-360.5.3-36
Debian:8w3mbefore 0.5.3-19+deb8u30.5.3-19+deb8u3
openSUSE:Tumbleweedw3mbefore 0.5.3+git20180125-1.140.5.3+git20180125-1.14
SUSE:Linux Enterprise Desktop 12 SP3w3mbefore 0.5.3.git20161120-161.3.40.5.3.git20161120-161.3.4

Same product

tats: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-9429An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor
  • CVE-2016-9428An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor
  • CVE-2016-9426An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor
  • CVE-2016-9425An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor
  • CVE-2016-9424An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor
  • CVE-2016-9423An issue was discovered in the Tatsuya Kinoshita w3m fork before 0.5.3-31.
    36Monitor

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
alpine:w3m0.5.3_git20241203-r0 · Alpine:v3.23Package registry (OSV)
debian:w3m0.5.3-36 · Debian:12Package registry (OSV)
opensuse:w3m0.5.3+git20180125-1.14 · openSUSE:TumbleweedPackage registry (OSV)
suse:w3m0.5.3.git20161120-161.3.4 · SUSE:Linux Enterprise Desktop 12 SP3Package 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.

No credits in the CNA record.

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 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-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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 (4 more)

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

All records