CVE-2026-124028: mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers t

Q: How do I fix CVE-2026-124028?

mistral.rs: upgrade to 0.9.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-124028 being exploited?

CVE-2026-124028 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-124028 affect?

CVE-2026-124028 affects mistral.rs. Severity is medium (CVSS 4.2). mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject tool calls by placing delimiter strings in text the model quotes. Attackers controlling documents, web pages or tool outp

Q: How urgent is CVE-2026-124028?

Priority 15/100. No elevated risk signals yet.

Routine

MEDIUM 4.2UPGRADE

CVE-2026-124028 is a medium-severity flaw (CVSS 4.2) affecting mistral.rs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject tool calls by placing delimiter strings in text the model quotes. Attackers controlling documents, web pages or tool outputs can embed tags like </tool_call> to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-140
Published	2026-11-06
Last modified	2026-11-06

Publisher (CNA): VulnCheck · Vendor: ericlbuehler · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-06 19:14 UTCPublished CVE record published
2026-11-06 19:14 UTCUpdated Record last modified

ericlbuehler mistral.rs UPGRADE

Affected: < 0.9.5

Fixed in: 0.9.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mistral.rs || rpm -q mistral.rs || mistral.rs --version

2. UPGRADE to 0.9.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mistral.rs

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mistral.rs

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-124028?

mistral.rs: upgrade to 0.9.5. Exact commands for each OS are on this page.

Is CVE-2026-124028 being exploited?

CVE-2026-124028 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-124028 affect?

CVE-2026-124028 affects mistral.rs. Severity is medium (CVSS 4.2). mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject tool calls by placing delimiter strings in text the model quotes. Attackers controlling documents, web pages or tool outp

How urgent is CVE-2026-124028?

Priority 15/100. No elevated risk signals yet.

References

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