CVE-2026-40890 | gomarkdown out-of-bounds (GHSA-77fj-vx54-gvh7)

VDB-358570 · CVE-2026-40890 · GHSA-77FJ-VX54-GVH7 GOMARKDOWN OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.3 $0-$5k 1.53+ Summaryinfo A vulnerability, which was classified as problematic, was found in gomarkdown markdown. This vulnerability affects unknown code. Executing a manipulation can lead to out-of-bounds. This vulnerability is registered as CVE-2026-40890. It is possible to launch the attack remotely. No exploit is available. A patch should be applied to remediate this issue. Detailsinfo A vulnerability classified as problematic was found in gomarkdown markdown (affected version not known). This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. CVE summarizes: The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778. The advisory is available at github.com. This vulnerability was named CVE-2026-40890 since 04/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. Applying the patch 759bbc3e32073c3bc4e25969c132fc520eda2778 is able to eliminate this problem. The bugfix is ready for download at github.com. Productinfo Vendor gomarkdown Name markdown License open-source Website Product: https://github.com/gomarkdown/markdown/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.4 VulDB Meta Temp Score: 6.3 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.5 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds CWE: CWE-125 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 759bbc3e32073c3bc4e25969c132fc520eda2778 Timelineinfo 04/15/2026 CVE reserved 04/21/2026 +6 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-77fj-vx54-gvh7 Status: Confirmed CVE: CVE-2026-40890 (🔒) GCVE (CVE): GCVE-0-2026-40890 GCVE (VulDB): GCVE-100-358570 Entryinfo Created: 04/21/2026 22:29 Changes: 04/21/2026 22:29 (64) Complete: 🔍 Cache ID: 99:67B:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸