CVE-2026-86303: Buffer Overflow (CVSS 7.3)

Description

A vulnerability was determined in 92181 markdown up to 058cab0cb7fb245a0ccc6b8446963ff8d573558f. Affected by this issue is the function lds of the file md.c. Executing a manipulation can lead to out-of-bounds read. The attack can be executed remotely. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. This patch is called c000d2f9cf390c315378d3717cf20911cf3e80a6. A patch should be applied to remediate this issue.

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CVSS v3.1 Score

7.3

HIGH

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

EPSS — Exploit Prediction

0.0031

Probability of exploitation

0.24%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-125 Out-of-bounds Read

References

Other References

https://github.com/92181/markdown/ https://github.com/92181/markdown/commit/c000d2f9cf390c315378d3717cf20911cf3e80a6 https://github.com/92181/markdown/issues/1 https://github.com/92181/markdown/pull/2 https://vuldb.com/cve/CVE-2026-86303 https://vuldb.com/submit/907499 https://vuldb.com/vuln/399467 https://vuldb.com/vuln/399467/cti https://github.com/92181/markdown/issues/1

Frequently Asked Questions

What is CVE-2026-86303? +

A vulnerability was determined in 92181 markdown up to 058cab0cb7fb245a0ccc6b8446963ff8d573558f. Affected by this issue is the function lds of the file md.c. Executing a manipulation can lead to out-of-bounds read. The attack can be executed remotely. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. This patch is called c000d2f9cf390c315378d3717cf20911cf3e80a6. A patch should be applied to remediate this issue. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-86303? +

CVE-2026-86303 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0031, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-86303? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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