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CVE-2026-59926VulnerabilityPublished

src/mistune/directives/admonition.py concatenates the Admonition directive · Prior to 3.2.1, render_admonition()

Affects mistuneSource GCVE Database

0
Authoritative record:CVE-2026-59926· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium · fixed in 1.4.0_6 : update mistune when convenient.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 4.0 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.4.0_6, 5.1.2_4
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade adr-viewer to 1.4.0_6; recon-ng to 5.1.2_4.

Affected software

ProductAffectedFixed in
Ubuntu 16.04 LTSmistunepkg:deb/ubuntu/mistune?arch=source&distro=xenialOther threatsAffected
  • =0.6-2
  • =0.7.1-1
Fixed in–
Ubuntu 18.04 LTSmistunepkg:deb/ubuntu/mistune?arch=source&distro=bionicOther threatsAffected
  • 0.7.4-1 – 0.8.3-2
4 affected builds
Fixed in–
Ubuntu 20.04 LTSmistunepkg:deb/ubuntu/mistune?arch=source&distro=focalOther threatsAffected
  • =0.8.4-1
  • =0.8.4-2
Fixed in–
Ubuntu 22.04 LTSmistunepkg:deb/ubuntu/mistune?arch=source&distro=jammyOther threatsAffected
  • =0.8.4-4
  • =0.8.4-5
  • =2.0.0-1+really0.8.4-1
Fixed in–
Ubuntu 24.04 LTSmistunepkg:deb/ubuntu/mistune?arch=source&distro=nobleOther threatsAffected
  • =2.0.4-2
  • =3.0.2-1
Fixed in–
Ubuntu 25.10mistunepkg:deb/ubuntu/mistune?arch=source&distro=questingOther threatsAffected
  • =3.0.2-2
  • =3.1.3-1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied by upgrading to recon-ng versions 1.4.0_6 or 5.1.2_4 or later. Applying these updates will remediate the vulnerability by properly escaping the class option to prevent XSS. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2026-59926 is a cross-site scripting (XSS) vulnerability in the Adr viewer's Mistune component used by recon-ng. The flaw stems from improper escaping of the Admonition directive's class option before it is inserted into the HTML class attribute. Although the directive name is validated, the class option is not sanitized, allowing injection of malicious code. Multiple specific versions of recon-ng are affected. A patch fixing this issue is available in versions 1.4.0_6 and 5.1.2_4.

References

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