How severe is CVE-2017-9526?

CVE-2017-9526 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-9526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9526?

CVE-2017-9526 affects Gnupg Libgcrypt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9526?

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

When was CVE-2017-9526 published?

CVE-2017-9526 was published on 2017-06-11 and last updated on 2026-06-17.

CVE-2017-9526

CVE-2017-9526 is a medium-severity vulnerability in Gnupg Libgcrypt with a CVSS 3.x base score of 5.9. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Gnupg Libgcrypt
Published: 2017-06-11
Last modified: 2026-06-17

Description

In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.

Frequently asked questions

What is CVE-2017-9526?: In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.
How severe is CVE-2017-9526?: CVE-2017-9526 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-9526 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9526?: CVE-2017-9526 affects Gnupg Libgcrypt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9526?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-9526 published?: CVE-2017-9526 was published on 2017-06-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*

More vulnerabilities in Gnupg Libgcrypt

CVE-2021-3345 — High (CVSS 7.8): _gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the…
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