VDB-358952 · CVE-2026-6861 · Nessus 311386

GNU Emacs SVG File off-by-one

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability was found in GNU Emacs. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component SVG File Handler. Such manipulation leads to off-by-one. This vulnerability is uniquely identified as CVE-2026-6861. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in GNU Emacs (version now known) and classified as critical. Affected by this issue is some unknown processing of the component SVG File Handler. The manipulation with an unknown input leads to a off-by-one vulnerability. Using CWE to declare the problem leads to CWE-193. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in GNU Emacs. This vulnerability, a memory corruption issue, occurs when Emacs processes specially crafted SVG (Scalable Vector Graphics) CSS (Cascading Style Sheets) data. A local user could exploit this by convincing a victim to open a malicious SVG file, which may lead to a denial of service (DoS) or potentially information disclosure.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2026-6861 since 04/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 311386 (Fedora 43 : emacs (2026-290753da75)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (311386). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Word Processing Software

Vendor

Name

Emacs

License

open-source

Website

Vendor: https://www.gnu.org/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (redhat): 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Off-by-one
CWE: CWE-193 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 311386
Nessus Name: Fedora 43 : emacs (2026-290753da75)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/22/2026 Advisory disclosed
04/22/2026 +0 days CVE reserved
04/22/2026 +0 days VulDB entry created
05/01/2026 +9 days VulDB entry last update

Sourcesinfo

Vendor: gnu.org

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2026-6861 (🔒)
GCVE (CVE): GCVE-0-2026-6861
GCVE (VulDB): GCVE-100-358952

Entryinfo

Created: 04/22/2026 17:26
Updated: 05/01/2026 19:19
Changes: 04/22/2026 17:26 (61), 05/01/2026 19:19 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.