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NVD / CVE Program· CNA VulnCheck

CVE-2026-100834: http4k before 6.48.0.0 Digest Authentication Replay Protection Bypass

HighCVSS 8.2 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 0.32% (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.
  • Fixed version: org.http4k:http4k-security-digest (Maven) 5.42.0.0, 6.48.0.0, 4.51.0.0.

Low priority for now. Upgrade to org.http4k:http4k-security-digest (Maven) 5.42.0.0, 6.48.0.0, 4.51.0.0 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

http4k's Digest authentication module (org.http4k:http4k-security-digest) before versions 6.48.0.0, 5.42.0.0 and 4.51.0.0 defaults the nonceVerifier parameter of ServerFilters.DigestAuth and DigestAuthProvider to { true }, so every nonce is accepted regardless of its value, age, or prior use. Applications relying on this default have no replay protection on Digest authentication: an attacker who can capture a valid 'Authorization: Digest' response (for example by observing network traffic or reading logs) can replay it indefinitely against the same protected resource.

Published
Sep 27, 2026
Updated
Oct 29, 2026
EPSS
0.3% · 25th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 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 · VulnCheck
8.2
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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-2026-100834

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 (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • http4k http4k

    • 6.48.0.0, 5.42.0.0, 4.51.0.0not affected
    • 6.0.0.0 and later · before 6.48.0.0affected
    • 5.0.0.0 and later · before 5.42.0.0affected
    • before 4.51.0.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Mavenorg.http4k:http4k-security-digestfrom 5.0.0.0 · before 5.42.0.05.42.0.0
Mavenorg.http4k:http4k-security-digestfrom 6.0.0.0 · before 6.48.0.06.48.0.0
Mavenorg.http4k:http4k-security-digestbefore 4.51.0.04.51.0.0

Same product

http4k: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-55875http4k has a potential XXE (XML External Entity Injection) vulnerability
    40Plan
  • CVE-2026-100725http4k before 6.48.0.0 Cookie Scoping Bypass via BasicCookieStorage
    33Monitor
  • CVE-2026-120317http4k 4.9.10.0 before 6.60.0.0 Digest auth-int Missing Body Integrity
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-54148Sep 18, 2026 · http4k: `DigestAuthProvider.verify` did not bind to request URI
    32Monitor
  • ← EarlierCVE-2026-100724Sep 27, 2026 · http4k before 6.49.0.0 Host Header Routing Bypass via reverseProxy
    25Monitor
  • Later →CVE-2026-120316Nov 2, 2026 · http4k before 6.62.0.0-ee Path Traversal via ThymeleafTemplates Template Resolution
    32Monitor

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
Maven:org.http4k:http4k-security-digest4.51.0.0Package registry (OSV)
Maven:org.http4k:http4k-security-digest5.42.0.0Package registry (OSV)
Maven:org.http4k:http4k-security-digest6.48.0.0Package 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.

Variant candidates

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

  • CVE-2026-541489 days aparthttp4k: `DigestAuthProvider.verify` did not bind to request URI
    32Monitor

Not on record for this CVE: researcher credit · public bounty program.

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

Weakness class (CWE)

CWE-294 · Authentication Bypass by Capture-replay

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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.

References

Show all references (3 more)

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

All records