PT-2026-5427 · Snakeyaml+1 · Snakeyaml+1

Maoqiu · CVE-2026-1691 · Published 2026-01-30 · Updated 2026-03-03

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions bolo-solo versions up to 2.6.4

Description A flaw exists in bolo-solo up to version 2.6.4 related to deserialization. The issue resides within the importMarkdownsSync function located in the file src/main/java/org/b3log/solo/bolo/prop/BackupService.java of the SnakeYAML component. This manipulation can be initiated remotely, and details of the exploit are publicly available.

Recommendations Versions prior to 2.6.4 should be updated. As a temporary workaround, consider restricting access to the importMarkdownsSync function until a patch is available.

Exploit

Fix

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-20

CWE-502

Related Identifiers

CVE-2026-1691

Affected Products

Snakeyaml

Bolo-Solo

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1691.json · Exploit
• 🔥 https://github.com/bolo-blog/bolo-solo/issues/325#issue-3828755519 · Exploit
• https://github.com/bolo-blog/bolo-solo/issues/325 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-1691 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-1691 · Security Note
• https://vuldb.com/?id.343485 · Note
• https://t.me/CVEtracker/43311 · Telegram Post
• https://vuldb.com/?submit.741899 · Note
• https://t.me/cveNotify/153869 · Telegram Post
• https://twitter.com/CVEnew/status/2017287019194384787 · Twitter Post
• https://vuldb.com/?ctiid.343485 · Note