GHSA-5wr9-m6jw-xx44: scriban (CVE-2026-74790)

Scriban: Sandbox escape due to TypedObjectAccessorcache bypassing MemberFilter after TemplateContext reuse

CVSS 9.3 CriticalCriticalEPSS 0.0047 · 41st percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

Published by the GitHub Advisory Database at 24 Mar 2026, 22:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
scriban	NuGet	<7.0.0	7.0.0
Scriban.Signed	NuGet	<7.0.0	7.0.0

Identifiers

GHSA-5wr9-m6jw-xx44 · CVE-2026-74790

Weakness (CWE)

CWE-693

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Scriban versions before 7.0.0, and the Scriban.Signed package before 7.0.0, cache member accessors by type, so a reused TemplateContext keeps exposing members that a later, tighter MemberFilter should hide. An attacker who can supply templates to a reused context can read, and possibly write, filtered properties or fields of plain .NET objects. Upgrade to 7.0.0 or later. The source gives no other workaround.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0047, the 41st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:21 UTC First seen by agentprime
31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.