How severe is CVE-2026-32733?

CVE-2026-32733 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-32733 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32733?

CVE-2026-32733 affects Halloy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32733?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-32733 have an EU (EUVD) identifier?

Yes. CVE-2026-32733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13863.

When was CVE-2026-32733 published?

CVE-2026-32733 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-32733

CVE-2026-32733 is a medium-severity vulnerability in Halloy with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13863
Weakness: CWE-22
Affected product: Halloy
Published: 2026-03-20
Last modified: 2026-06-17

Description

Halloy is an IRC application written in Rust. Prior to commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, the DCC receive flow did not sanitize filenames from incoming `DCC SEND` requests. A remote IRC user could send a filename with path traversal sequences like `../../.ssh/authorized_keys` and the file would be written outside the user's configured `save_directory`. With auto-accept enabled this required zero interaction from the victim. Starting with commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, all identified code paths sanitize filenames through a shared `sanitize_filename` function.

Frequently asked questions

What is CVE-2026-32733?: Halloy is an IRC application written in Rust. Prior to commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, the DCC receive flow did not sanitize filenames from incoming `DCC SEND` requests. A remote IRC user could send a filename with path traversal sequences like `../../.ssh/authorized_keys` and the file would be written outside the user's configured `save_directory`. With auto-accept enabled this required zero interaction from the victim. Starting with commit 0f77b2cfc5f822517a256ea5a4b94bad8bfe38b6, all identified code paths sanitize filenames through a shared `sanitize_filename` function.
How severe is CVE-2026-32733?: CVE-2026-32733 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-32733 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32733?: CVE-2026-32733 affects Halloy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32733?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-32733 have an EU (EUVD) identifier?: Yes. CVE-2026-32733 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13863.
When was CVE-2026-32733 published?: CVE-2026-32733 was published on 2026-03-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:halloy:halloy:*:*:*:*:*:*:*:*

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