MediumCVE-2026-113470

Cryptographic issue in the Security Block-lists, Allow-lists, and other State component (CVE-2026-113470)

Published 20.10.2026Last modified 21.10.2026Sources: Debian LTS, HKCERT, Debian, Mozilla Mfsa, CVE.org, BSI

What is affected, what to do

Cryptographic issue in the Security Block-lists, Allow-lists, and other State component. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, Firefox ESR 115.43.1, Thunderbird 158.0.1, Thunderbird 153.5.1, and Firefox 158.0.2.

The available sources name no fixed version. Check the vendor guidance in the references below.

Affected: Debian Thunderbird 1:153.5.1esr-1~deb13u1..*
Debian Thunderbird 1:153.5.1esr-1~deb12u1..*
Debian Firefox-esr 153.5.1esr-1~deb13u1..*
Debian Firefox-esr 153.5.1esr-1~deb12u1..*

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

5.4

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

5.4

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: Debian LTS, HKCERT, Debian, Mozilla Mfsa, CVE.org, BSI

0.5 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 39.6

Show all metrics

Severity: Medium
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 69.54 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 5.4 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 5.4
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.5 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 39.6; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 20.10.2026

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Source: Debian LTS Advisories, HKCERT (CC BY 3.0 HK) · HKCERT rating: medium, Debian Security Advisories, mozilla_mfsa, cvelistv5, NVD (NIST), BSI WID Portal, BSI CSAF

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	firefox-esr	`bookworm`
Linux	debian	firefox-esr	`trixie`
Linux	debian	thunderbird	`bookworm`
Linux	debian	thunderbird	`trixie`

References & sources

bugzilla.mozilla.orgshow_bug.cgi?id=2083382
mozilla.orgsecurity/advisories/mfsa2026-111
mozilla.orgsecurity/advisories/mfsa2026-112
mozilla.orgsecurity/advisories/mfsa2026-113
openwall.comlists/oss-security/2026/10/20/30
mozilla.orgsecurity/advisories/mfsa2026-114
mozilla.orgsecurity/advisories/mfsa2026-115
lists.debian.orgdebian-lts-announce/2026/10/msg00041.html
bugzilla.mozilla.orgshow_bug.cgi?id=2084311
mozilla.orgsecurity/advisories/mfsa2026-116

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

21.10.2026Record modifiedCVE Program
New references:
- https://lists.debian.org/debian-lts-announce/2026/10/msg00041.html
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Reference added
—
https://lists.debian.org/debian-lts-announce/2026/10/msg00041.html
Source identifier: af854a3a-2127-422b-91ae-364da2661108

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://lists.debian.org/debian-lts-announce/2026/10/msg00041.html

20.10.2026Record modifiedMozilla

Description added or changed

New references:

Show 4 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	changed	Mozilla blocked compromised intermediate eMudhra certificates via OneCRL on the 17th of October which was distributed to clients via RemoteSettings the same day. This update contains the updated OneCRL block list, ensuring clients will block the compromised certificates even if RemoteSettings is disabled by policy or otherwise unavailable in the user's network environment. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, and Firefox ESR 115.43.1.	Mozilla blocked compromised intermediate eMudhra certificates via OneCRL on the 17th of October which was distributed to clients via RemoteSettings the same day. This update contains the updated OneCRL block list, ensuring clients will block the compromised certificates even if RemoteSettings is disabled by policy or otherwise unavailable in the user's network environment. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, Firefox ESR 115.43.1, Thunderbird 158.0.1, and Thunderbird 153.5.1.
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/113xxx/CVE-2026-113470.json">CVE-2026-113470</a>
Reference	added	—	https://www.mozilla.org/security/advisories/mfsa2026-114/
Reference	added	—	https://www.mozilla.org/security/advisories/mfsa2026-115/

Source identifier: security@mozilla.org

20.10.2026Record modifiedCVE Program
New references:
- http://www.openwall.com/lists/oss-security/2026/10/20/30
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Reference added
—
http://www.openwall.com/lists/oss-security/2026/10/20/30
Source identifier: af854a3a-2127-422b-91ae-364da2661108

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	http://www.openwall.com/lists/oss-security/2026/10/20/30

20.10.2026Record modifiedCISA ADP

CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CISA assessment (SSVC): exploitation: none known, automatable: no

Weakness type: CWE-295

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness type (CWE)	added	—	CWE-295
SSVC assessment	added	—	{"id":"CVE-2026-113470","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-20T14:29:36.088300Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

20.10.2026ReceivedMozilla

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	Mozilla blocked compromised intermediate eMudhra certificates via OneCRL on the 17th of October which was distributed to clients via RemoteSettings the same day. This update contains the updated OneCRL block list, ensuring clients will block the compromised certificates even if RemoteSettings is disabled by policy or otherwise unavailable in the user's network environment. This vulnerability was fixed in Firefox 158.0.1, Firefox ESR 153.5.1, and Firefox ESR 115.43.1.
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/113xxx/CVE-2026-113470.json">CVE-2026-113470</a>
Reference	added	—	https://bugzilla.mozilla.org/show_bug.cgi?id=2083382
Reference	added	—	https://www.mozilla.org/security/advisories/mfsa2026-111/
Reference	added	—	https://www.mozilla.org/security/advisories/mfsa2026-112/
Reference	added	—	https://www.mozilla.org/security/advisories/mfsa2026-113/

Source identifier: security@mozilla.org

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