How severe is CVE-2026-0895?

No CVSS score has been assigned to CVE-2026-0895 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-0895?

CVE-2026-0895 affects the following packages: cpsit/typo3-mailqueue (Packagist), cpsit/typo3-mailqueue (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2026-0895?

Update cpsit/typo3-mailqueue to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-0895 is resolved across your whole dependency graph.

How do I detect CVE-2026-0895 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cpsit/typo3-mailqueue, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-0895 if there is no patch (or I can't update yet)?

Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Is CVE-2026-0895 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-0895 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-0895?

CVE-2026-0895 has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 4th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-0895?

CVE-2026-0895 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-0895 published, and has it been updated?

CVE-2026-0895 was published on January 20, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

CVE-2026-0895 — typo3-mailqueue

Fix: CPS-IT/mailqueue@12a0a35

CVE-2026-0895 is a Deserialization of Untrusted Data vulnerability in cpsit/typo3-mailqueue. A fix is available for cpsit/typo3-mailqueue — see the affected versions and patch details below.

Insecure Deserialization in extension "Mailqueue" (mailqueue)

Also known asGHSA-ggff-9mj3-7246

Published

Jan 20, 2026

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-0895.

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs4th percentile — riskier than 4% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

2 pkgs affected

🐘cpsit/typo3-mailqueue🐘cpsit/typo3-mailqueue

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The extension extends TYPO3’s FileSpool component, which was vulnerable to Insecure Deserialization prior to TYPO3-CORE-SA-2026-004. Since the related fix is overwritten by the extension, using the extension with a patched TYPO3 core version still allows for Insecure Deserialization, because the affected vulnerable code was extracted from TYPO3 core to the extension.

More information about this vulnerability can be found in the related TYPO3 Core Security Advisory TYPO3-CORE-SA-2026-004.

References

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`cpsit/typo3-mailqueue`	all versions	0.4.3`composer require cpsit/typo3-mailqueue:^0.4.3`
🐘Packagist	`cpsit/typo3-mailqueue`	≥ 0.5.0&&< 0.5.1	0.5.1`composer require cpsit/typo3-mailqueue:^0.5.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cpsit/typo3-mailqueue, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update cpsit/typo3-mailqueue to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-0895 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

## Description The extension extends TYPO3’s FileSpool component, which was vulnerable to Insecure Deserialization prior to [TYPO3-CORE-SA-2026-004](https://typo3.org/security/advisory/typo3-core-sa-2026-004). Since the related fix is overwritten by the extension, using the extension with a patched TYPO3 core version still allows for Insecure Deserialization, because the affected vulnerable code was extracted from TYPO3 core to the extension. More information about this vulnerability can be found in the related TYPO3 Core Security Advisory [TYPO3-CORE-SA-2026-004](https://typo3.org/security/

O3 Security · Impact-Aware SCA

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CVE-2026-0895 — typo3-mailqueue

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

Real-World Exposure

Description

Description

References

Affected Packages

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2026-0895 in your dependencies?