How severe is CVE-2026-30909?

CVE-2026-30909 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-30909 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30909?

CVE-2026-30909 affects Timlegge Crypt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30909?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-30909 have an EU (EUVD) identifier?

Yes. CVE-2026-30909 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10199.

When was CVE-2026-30909 published?

CVE-2026-30909 was published on 2026-03-08 and last updated on 2026-06-17.

CVE-2026-30909

CVE-2026-30909 is a critical-severity vulnerability in Timlegge Crypt with a CVSS 3.x base score of 9.8. 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-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10199
Weakness: CWE-190
Affected product: Timlegge Crypt
Published: 2026-03-08
Last modified: 2026-06-17

Description

Crypt::NaCl::Sodium versions through 2.002 for Perl has potential integer overflows. bin2hex, encrypt, aes256gcm_encrypt_afternm and seal functions do not check that output size will be less than SIZE_MAX, which could lead to integer wraparound causing an undersized output buffer. Encountering this issue is unlikely as the message length would need to be very large. For bin2hex() the bin_len would have to be > SIZE_MAX / 2 For encrypt() the msg_len would need to be > SIZE_MAX - 16U For aes256gcm_encrypt_afternm() the msg_len would need to be > SIZE_MAX - 16U For seal() the enc_len would need to be > SIZE_MAX - 64U

Frequently asked questions

What is CVE-2026-30909?: Crypt::NaCl::Sodium versions through 2.002 for Perl has potential integer overflows. bin2hex, encrypt, aes256gcm_encrypt_afternm and seal functions do not check that output size will be less than SIZE_MAX, which could lead to integer wraparound causing an undersized output buffer. Encountering this issue is unlikely as the message length would need to be very large. For bin2hex() the bin_len would have to be > SIZE_MAX / 2 For encrypt() the msg_len would need to be > SIZE_MAX - 16U For aes256gcm_encrypt_afternm() the msg_len would need to be > SIZE_MAX - 16U For seal() the enc_len would need to be > SIZE_MAX - 64U
How severe is CVE-2026-30909?: CVE-2026-30909 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-30909 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30909?: CVE-2026-30909 affects Timlegge Crypt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30909?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-30909 have an EU (EUVD) identifier?: Yes. CVE-2026-30909 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10199.
When was CVE-2026-30909 published?: CVE-2026-30909 was published on 2026-03-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:timlegge:crypt\:\:nacl\:\:sodium:*:*:*:*:*:perl:*:*

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