DEBIAN-CVE-2026-112021

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Source

https://security-tracker.debian.org/tracker/CVE-2026-112021

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-112021.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-112021

Upstream

CVE-2026-112021

Published

2026-10-18T12:17:15Z

Modified

2026-10-23T18:05:33Z

Severity

8.7 (High) CVSS_V4 - 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

[none]

Details

snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.

References

https://security-tracker.debian.org/tracker/CVE-2026-112021

Affected packages

Debian:13 / snac2

Package

Name: snac2
Purl: pkg:deb/debian/snac2?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.75-2

2.81-1~bpo13+1

2.81-1~bpo13+2

2.81-1

2.82-1~bpo13+1

2.82-1

2.83-1~bpo13+1

2.83-1

2.84-1~bpo13+1

2.84-1

2.84-2~bpo13+1

2.84-2

2.84-3~bpo13+1

2.84-3

2.85-1~bpo13+1

2.85-1

2.87-1~bpo13+1

2.87-1

2.88-1~bpo13+1

2.88-1

2.89-1~bpo13+1

2.89-1

2.90-1~bpo13+1

2.90-1

2.91-1~bpo13+1

2.91-1

2.92-1~bpo13+1

2.92-1

2.93-1~bpo13+1

2.93-1

2.94-1~bpo13+1

2.94-1

2.95-1~bpo13+1

2.95-1

2.96-1~bpo13+1

2.96-1

Ecosystem specific

{
    "urgency":  "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-112021.json"

Debian:14 / snac2