Vulnerability-Lookup

OPENSUSE-SU-2026:12422-1

Vulnerability from csaf_opensuse - Published: 2026-11-04 00:00 - Updated: 2026-11-06 11:27

Summary

python313-markdown2-2.5.5-3.1 on GA media

Severity

Moderate

Notes

Title of the patch: python313-markdown2-2.5.5-3.1 on GA media

Description of the patch: These are all security issues fixed in the python313-markdown2-2.5.5-3.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-12422

CVE-2026-118694

Affected products

Recommended 8 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:python313-markdown2-0:2.5.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-markdown2-0:2.5.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-markdown2-0:2.5.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python313-markdown2-0:2.5.5-3.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-markdown2-0:2.5.5-3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-markdown2-0:2.5.5-3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-markdown2-0:2.5.5-3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:python314-markdown2-0:2.5.5-3.1.x86_64	—	Vendor Fix

Threats

Impact important

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2026-118694/	self
https://www.suse.com/security/cve/CVE-2026-118694	external
https://bugzilla.suse.com/1288876	external

JSON

To clipboard

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}

CVE-2026-118694 (GCVE-0-2026-118694)

Vulnerability from cvelistv5 – Published: 2026-10-28 21:11 – Updated: 2026-10-29 17:22

Title

python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations

Summary

python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or '![a](' sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time.

Severity

8.7 (High)


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

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-29 15:43 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7609 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/trentm/python-markdown2/issues/750	issue-tracking
https://github.com/trentm/python-markdown2	product
https://github.com/trentm/python-markdown2/blob/2…	technical-description
https://github.com/trentm/python-markdown2/blob/2…	technical-description
https://github.com/trentm/python-markdown2/pull/751	patchissue-tracking
https://www.vulncheck.com/advisories/python-markd…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
trentm	python-markdown2	Affected: 0 , ≤ 2.5.5 (custom) cpe:2.3:a:python-markdown2_project:python-markdown2::::::::

Date Public

2026-10-28 00:00

Credits

Muhammadyusuf Dilmurodov (agrresore) ParamTanna

Show details on NVD website

JSON

To clipboard

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          "url": "https://github.com/trentm/python-markdown2"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029"
        },
        {
          "tags": [
            "patch",
            "issue-tracking"
          ],
          "url": "https://github.com/trentm/python-markdown2/pull/751"
        },
        {
          "name": "VulnCheck Advisory: python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations"
        }
      ],
      "title": "python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-118694",
    "datePublished": "2026-10-28T21:11:20.814Z",
    "dateReserved": "2026-10-28T17:31:29.498Z",
    "dateUpdated": "2026-10-29T17:22:18.429Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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