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Public proof of conceptFix available

CVE-2026-43512

A public proof of concept exists; no exploitation attested.

  • Published2026-05-12
  • Fixed in11.0.22 · 10.1.55 · 9.0.118
  • WeaknessCWE-592

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Timeline

dates in UTC
  1. 2026-05-1216:16CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-43512?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-43512?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Apache Tomcat
BranchAffectedFixed in
11.0≥ 11.0.0, < 11.0.2211.0.22
10.1≥ 10.1.0, < 10.1.5510.1.55
9.0≥ 9.0.0, < 9.0.1189.0.118
7.0≥ 7.0.0, ≤ 7.0.109no fix published
8.5≥ 8.5.0, ≤ 8.5.100no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2026:69259 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat update

  • RHSA-2026:68651 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat9 security update

  • RHSA-2026:68677 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat security update

  • RHSA-2026:68660 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat security, bug fix, and enhancement update

  • RHSA-2026:68659 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat security update

  • RHSA-2026:68678 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: tomcat security update

10 more advisories

Full record on NVD

Fix

  1. Update Apache Tomcat to 11.0.22 · 10.1.55 · 9.0.118
  2. Vendor fix Red Hat Product Security RHSA-2026:69259 · 9 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:43401 · 33 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHSA-2026:43402 · 1 productBefore applying the update, back up your existing Red Hat JBoss Web Server installation, including all applications and configuration files. The References section of this erratum contains a download link for the update. You must be logged in to download the update.
  5. Vendor fix Red Hat Product Security RHSA-2026:16528 · 21 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  6. Workaround from the vendor Red Hat Product Security RHSA-2026:69259 · 9 productsTo mitigate this issue, disable DIGEST authentication within Apache Tomcat if it is not essential for your environment. This involves modifying the server's authentication configuration to utilize alternative methods or remove the DIGEST realm. A service restart is required for these changes to tak…

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedcovepseng/cve-2026-43512-poc
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-05-12
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-43512?

DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from before 7.0.0. Older unsupported versions any also be affect Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Is CVE-2026-43512 actively exploited?

Active exploitation of CVE-2026-43512 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-43512?

CVE-2026-43512 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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